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APPENDIX.

3.

The descriptions and representations of the following species appear to me to be whollyunavailable for systematic arrangement; I merely enumerate them for the sake of com-pleteness, and will not venture upon any conjectural construction.

Asaphus Cawdori, Muuchis. Sil. Syst. ii, 655, PI. VII, Fig. 9 . Munster, Beitr. iii,38. 1, Tab. V, Fig. 8.

Asaphus subcaudatus, Murchis. ibid. Fig. 10; probably only a larger individual of thepreceding species.

Asaphus diurus, Green, Sill. Americ. Journ. 1839, vol. xxxvii, p. 40. A species relatedto As. selenurus, therefore a Phacops, with a double-pointed end of the caudal shield. (Seeante, p. 95.)

Asaphuspusillus, Munster, Beitr. iii, 39. 2, Tab. V, Fig. 9 .

Asaphus brevis , ibid. 39. 3, Fig. 10.

Asaphus grandis , ibid. 39. 4, Tab. IX, Fig. 1; a fragment of a caudal shield, which isprobably different from Sars ’ species of the same name. (See p. 109.)

Paradoccides brevimucronatus, ibid. 40. l,Tab. V, Fig. 12, seems to be a Lichas laciniatus;but, according to Dr. Beyricli ( Bohm. tr. 16), it is a Cheirums.

Bumastes franconicus, ibid. 42, Tab. V, Fig. 7. Cephalic and caudal shield without anyspecific characters.

Bumastes planus, ibid. 43. 2, Fig. 18 , a larger, more compressed individual of thepreceding species. Trinucleus (?) Nillsoni, ibid. 46. 5, Tab. V, Fig. 25; Trinucl. (;)Otarion, Tab. VI, Fig. 26, and Trinucleus intermedius, ibid. V. 116, Tab. X, Fig. 10, arefragments that cannot be distinctly recognized, but they are hardly Trinuclei. Accordingto Dr. Beyrich, they are parts of the cephalic shield of Bronteus ( Calymenc ) furcata,Munster, Beitr. V, 113. 2, Tab. X. Fig. 9; it has a semicircular, granulated, caudalshield, with a many-jointed axis, and seven lateral ribs that are slit to one half of theirlength.