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Show 474 EXPLANATION (6. Operculum. y. Suboperculum. J'. Intet·operculum. •· Postmandibulary. ~· Mandibulary. &. Os Hyoides bearing the branchial rays. Plate VII represents new species of ordinary genera. Fig. 1. Diodon antennatus, Cuv., so called from the circumstance of its bearing several fleshy filaments on the fore part of the head, at a.a.a. as well as on other parts of its body, which are independent of its spines. Its colour is a russet grey, with dark russet spots, arranged symmetrically. Fig. 2. Batistes geographicus, Peron. So named from its spots. It belongs to the first division of my Monocanthi. Fig. 3. Batistes penicilligerus, Peron. So called from the ramose tentacula with which its body is bristled. It belongs to the third division ofmy Monocanthi. Plate VIII. We have left here certain species of fishes, which, at the time of the publication of our first edition, formed new genera or subgenera. Fig. 1. Myletes macropomus, Cu v. One of the three· speci~s of American Myletes mentioned in the note to that genus. Thts one is distinguished by the largeness of its opercula. Fig. 2. Hydrocyon brevidens, Cuv. This species, which is from Brazil, is also mentioned in a note to the genus under which it is placed. Its specific character consists in being striped longitudinally with blackish. Fig. 3. Pristigaster. A subgenus of the family of the Clupere . This species is entirely silvery. Fig. 4. Sudis gigas. An extremely large Brazilian species remarkable for its bony scales :rnd the shortness of its tail. Plate IX. Two species of Sternoptyx, the first of which, Sternoptyx diaphana, has hitherto only been known fr?m a bad figure by Hermann. The second is new, and was discovered in the vicinity of the Azores by M. Olfers. The Gymnarchus senegalensis is a new species of a genus recently discovered in the Nile by M. Rifaud. Plate X, Fig. 1, .Notarchus. A new genus of the Gastero· poda Tectibranchiata. OF THE PLATES. 475 Fig. 2. Pleurobranchus luniceps. A new species of the genus Pleurobranchus. a. the penis; b.b. tentacula; c. the anus; d.d. the foot which everywhere projects beyond the body. ~ig .. 3. The animal of an Anomia. a. part of the muscle ~h1ch 1s connected with the third valve; b. the foot; c. a portion of the muscle which unites the two large valves; d.d. the mantle; e.e, the shell. Fig. 4. The Sigaretus with its fleshy mantle envelopinr,. and eoncealing its shell. 0 Fig. 5. The animal of a Tridacna. a. a fibrous bundle analogous to the tht·eacls of the Muscle, by which the Trirlacna attaches itself to rocks; b. aperture for the entrance of water; c. opening corresponding to the anus; d. transverse muscle. . Fig. 6. A reduced sketch of the beautiful Polyclinum diazona, <hscoverecl by M. de La Roche, and recognized by M. Savigny .:~.s .one of the compound Ascidire. END Of' VOL. II . |
