TABLE OF THE PLATES. Xvil 



PISCES. Vol. II. Page 



Plate 38. ler. Fig. 3. — Trachinotus pampaxus, Cuv.* , . . 129 



Pate 38. quar. Fig. 1. — TETR.\PTERrs Indicus, Cuv. . . . 128 



Fig. 2. — Skeleton of the Tetrapterls belone, Ra. . 128 



Plate 39. Fig. 1. — Xiphias gladius, Lin. (The Commou Suord-F;f.h) . 127 



Fig. 2. — Same Fish, but of a younger age^ . . . 127 



Fig. 3. — Tetrapturus belone, Raf. ' . . . 128 



Fig. 4. — Hi.sTiuPHORUs pllchellus .... 128 



Plate 39. ter. Fig. 1. — Rhyinchichtys pelamidis, Cuv.f . . . 94 



Fig. 2. — Nandus jiARMon.^Tvs, Cuv.J . . .94 



Fig. .3. — Scomder colias, Gm. {The Mediterranean Mackerel) . 125 

 Plate 40. Fig. 1. — Naucrates Indicus. A new species, which aiiproaches 



closely to the Scomber ductor, Lin. . . . 129 



Fig. 2. — MAST-iCEMBEMs MACLLATis. It is RhyuchoLclella maculata 



Reinvvaidt. ... . igQ 



Fig. 3. — Seriola RivoLii § . . .... 13U 



Fig. 4. — Head of the Elacate Ati.antica ; Centronutus spiuosus, 



Mitchell . . . . . 129 



Fig. 5. — Head of the Rhynchobdella ARAL , . . 130 



Fig. 6. — Head of the Mastacembelvs armatis; Macroguathus 



armatus, Lacep. . . . .130 



Fig. 7.— Head of the NoTACANTHLs nasus, Rl. . . , I3(j 



Plate 40. bis. Fig. 1. — Bovrhtls diacanthls, Cuv.|| . , .94 



fifth of its length, its thickness one-third of its height. Its head one-fourth lets 

 high than long, is a fifth of the total length. 



* A new species found near Brazils, and other parts of South America. 



t It is to the researches of M. Dussuniier, thai we owe the knowledge of this 

 singular little fish, which he found in the stomach of a Tropical Bonita in the Indian 

 sea. It belongs to the group of Perches with eight rays to the gills and to the ven- 

 trals, consequently it is near the Holocentri ; but it constitutes a new genus, known 

 by a prolongation of the carrina of the cranium in a point which advances beyond 

 its mouth, almost the same as in the Lepidoleprus. The preoperculum has a 

 projecting spine towards its angle; but the angle of the operculum has only very 

 short spines, as in the Myripristis. We as yet only know one single species of this 

 genus, which we have named Rhynchichtys pelamidis. 



+ There must be added to the division of^ Percoides with a single dorsal and six 

 branchial rays, a fish very common in the lakes of Bengal ; it is the Cuius uandus 

 of Buchanan. The description given by this author, however, leaves us too manv 

 doubts to be able to fix with correctness the place of this sjiecies; butM. Du.-suiuiei' 

 to whom science is so much indebted, has recently brought to Europe a nandus as 

 fresh as if it were just out of the water ; which enables us to give a detailed and exact 

 description of it. This fish we shall now make the type of a genus, to follow imme- 

 diately after the Doules, p. 91. It is characterised by a very protractile mouth 

 furnished with fine short toft teeth, like the pile on velvet, in the two jaws, the palate 

 and vomer. The preoperculum and interopcrculum have their edges finely 

 indented. The spine of the operculum is so small that it is difiicult to perceive ir. 

 The protractibility of the upper jaw of this fish gives it an appaaiance quite difierent 

 fiom the Doules, and makes it more resemble a Mendole with a shortened body. 

 This affinity is increased, as the Mendoles, like this fish, have some teeth in the 

 palate, but fewer in number, and very few in the vomer. However the Nandus 

 cannot be placed in the family of the Menides, on account of the indentations of the 

 operculum. We know but one kind of them — the Xandus marmoiatus. 



§ A species which approaches closely the Sciiola cosmopolitaof Cuvier. It was 

 presented to the Cabinet Du Roi by the Duke of Rivoli. 



II We sought for a long time to know what the jugular fish could be, ligureU in the 



