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REPORT ON ZOOLOGY, MDCCCXLIII.

latus (id.)- Gray, with brown transverse bands; 41 inch. D. 31; A. 32;P. 14. Tahiti . S. crinitus (id.) Gray, belly and opercular spot black, twocirrhi above the eyes, no anal fin, pectorals very small; 31 inch. Patagonia.

PLECTOGNATHI.

Gymnodontes.— Diodon fuliginosus, De Kay. Olive-green above, orangebeneath, covered with triangular spines; three spines above each eye, caudalfin lanceolate; 2 inch. D. 14; P. 22 ; A. 8. D. verrucosus (id.) With round-ish scuta, from which spring flexible spines; 11 inch. D. 11; P.22; A. 10.New York Harbour.

Under the name of Acanthosoma, De Kay (1. c.) distinguishes a new genus,which differs from Diodon. in this, that the dorsal, caudal, and anal fins areunited. One species, A. Carinatum (Diodon carinatus, Mitch.), 1 inch long.D. ; C. + ; A. 52 ; P. 12.

Tetrodon aerostations, Jenyns (1. c.). Resembling lineatus, Bl., but wantingthe lateral line; back and upper part of sides spotted; 2$ inch. D. 11;A. 10; P. 11. T. implutus (id.). Olive colour, with white circular spots;nares tubular, forked; 5 inch. D. 10; A. 10; P. 16. Indian Ocean .T annulatus (id.). Dark brown above, with black circular spots ; nares cylin-drical, with two lateral openings; 9 inch. D. 8; A. 7; P. 15. Galapagos Islands . T. angusticeps (id.). Dark green above, two eirrhi in the middle ofthe baok, nares tubular, with two lateral openings; 9 inch. D. 8; A. 7;P. 15. Galapagos Islands .

Sclerobermi.— Ostracion undecim-aculeatus, Smith (Illust. South Africa ,10). Quadrangular; five spines on the back, six on the sides of the abdomen.Cape of Good Hope .

Proin the genus Ostracion De Kay separates a genus, Bactophrys, in whichhe places 0. Yalei, Storer, and 0. sexcornutus, Mitchill, besides a new species.The body is triangular, with strong spines in front of the anus, directedbackwards; spines above the eyes. In the new species, L. camelinus, thebaok is elevated into a spine, besides eight spines; 3j inch. D. 9; P. 10;A. 10.

Batistes fuliginosus, De Kay. Caudal fin doubly emarginate ; a single spinebetween the first and second dorsal fins; 12 inch. D. 2. 1. 28 ; P. 14; Y. 7;A. 26. New York Harbour.

Monocanthus setifer, De Kay. Some of the anterior rays of the dorsal finelongated into filaments; 7 inch. D. 1. 33; P. 13; A. 33. New YorkHarbour.

Aleuteres velutinus, Jenyns. Light brown, with four darker longitudinalbands, rough; 8 inch. D. 2. 33; A. 31. George’s Canal.