APPENDIX.

119

After I had brought my work to a conclusion, and was engaged in preparing the index,I received the second series of the c Magazin fur Naturvidenskaberne,’ (second series from1832, vols. i and ii.) This series contains some remarks by Esmark on the following fiveTrilobites ; see vol. i, p. 268, Tab. VIII.

1. Tril. Asettus, a ten-jointed Trilobite, incapable of rolling itself up (Fig . V), witha large caudal shield, the axis of which is wanting, but which nevertheless seems to bemany-jointed. Boeck represents this species in Keilliau’s Gaea Norwegica (1 Tril. No. 36),placing it next to lllaenus centrotus, Dalm., but between this and Esmark’s figure there is noresemblance.

2. Tril. elliptifrons, p. 269, Figs. 6, 7, a Phacops, with an undivided, narrow glabella,which seems most* nearly to resemble that of Ph . latifrons, hut which, perhaps, differsfrom it specifically in the narrow shape of the glabella, if the figure be correct. Boeck,who treats of this species (/. c. No. 1), likewise distinguishes it from Ph . latifrons, his Tril.elegans; Sars (ibid. No. 2, “by the wide (long?) elliptical glabella.” Both are found atMalmoekalven.

3. Tril. sphaericus, Fig. 8, according to Boeck, (l. c. sub No. 14,) is identical with Tril.clavifrons, Sars , concerning which I have already expressed my opinion (see ante, p. 99),connecting it with Dalman’s species of the same name. But Esmark’s figure exhibitsthree furrows on the glabella, and I am therefore still in doubt whether Tr. sphaericus canreally he Sars ’ Tr. clavifrons. If, however, this be the case, it would belong to Cgphaspisclavifrons.

4. Tr. semilunaris, Fig. 9, according to Boeck’s conjecture, (/. c. sub No. 10,) is only asmall individual of Phacops caudatus. (See ante, p. 94.)

5. Tr. dentatus, Fig. 10, is a large caudal shield, with a many-jointed axis, and threelarge lateral ribs curved backwards (the figure indicates 15 rings, and an oval terminaljoint); the ribs project over the margin of the shield in the shape of obtuse spines. Boeckadds (7 c. sub No. 7), that the semicylindrical glabella, which is rounded at the anteriorpart, has three lateral furrows, and that the posterior angles of the shield terminate inspines like the lateral lobes of the body rings. This species, therefore, is decidedly aPhacops of the division B d, and approximates to Phac. arachnoides. From these state-ments there appears now to be scarcely a doubt that it belongs to Dr. Loven’s newgenus Cgbele.

I likewise only received the work of F. A. Romer, mentioned at the conclusion of thebibliography, very recently. The author describes in it the following Trilobites :

1. Brontesflabellifer, p. 37, Tab. II, Fig. 1.

2. Br. signatus, ibid. p. 37, Figs. 2, 3; citing also Phillips-, Palaeozoic fossils, Tab. LVII,Fig. 255 ; a caudal shield of a shorter, more circular, form.

Br. (?) glabratus, ibid. Fig. 6. The central piece of a cephalic shield possessing theshell, but otherwise without satisfactory characters.

4. Calgmene Jordani, ibid. Fig. 4, certainly only a specimen of Phacops latifrons , I havea well-preserved specimen of this species lying before me (from the collection at Halle),which was found in the ground of the monastery at Michelstein, near Blankenburg . Romeralso refers to this specimen (p. xviii of his work).