140 MTTRiENID^. 



s-x. Messina. Xamcd L. diaphanus by Dr. Kaup. 

 y-ft. Nice. Purchased of Mr. Wright. 

 y. Australia. From the Haslar Collection. 



/3. Forms of L. niorrisii showing signs of a inore advanced development. 



In these, the snout is somewhat less obtuse, somewhat more 

 pointed and produced. 



(la. The body is compressed, the chorda dorsalis without ossifica- 

 tions, showing mei"ely segmentations : — Leptocephnlus hihronii, Kaup, 

 Apod. p. 149, fig. 12 ■ and Leptocepliahis gegenbauri, Kaup, Apod, 

 p. 149. fig. 11. 



a. Messina. Named L. hihronii by Dr. Kaup. 



b. Mediterranean. Named L. gegenbauri by Dr. Kaup. 



/3/j. The body has become more cylindrical in consequence of the 

 devclopnieut of the muscular system ; yet the chorda dorsalis is stiU 

 cartilaginous : — LepAocephalus kdUikeri, Kaup, Apod. p. 148, fig. 10 ; 

 Leptocephalus punctatus, Kaup, Apod. p. 148, fig. 8, 



a. Messina. Named L. kolUkeri by Dr. Kaup. 



b. Mediterranean. Purchased. 



b. Indian Ocean and Archipelago. 



Helmiclithya oculus, Peters, Moiiatsher. Ak. Wiss. Berlin, 180G, p. 525, 

 fig. 4. 



Body rather thick, in consequence of the development of the mus- 

 cular system ; chorda dorsalis cartilaginous, but with the neural 

 arches distinct. Snout obtusely rounded, short. Eyes large. Pec- 

 toral fins developed ; vertical fins very low. Vent near to the 

 middle or the total length. Jaws with minute teeth, 



Amboyna ; Madagascar. 

 a. Madagascar. Presented by Dr. J. E. Gray. 



2. End of the tail prolonged into a tapering 2>oint. 

 Leptocephalus acuticaudatus, Kaup, Apod. p. 151, fig. 16. 



Body compressed, its depth being more than the length of the head, 

 which is rather small. End of the tail prolonged, tapering. Snout 

 o])tusely rounded. Pectoral fins. Teeth none. 



Malabar. 



B. Pectoi-al Jins none. 



Leptocepbalichthys hypselosoma, Bleek. Act. Soc. Sc. Indo-Keerl. i. 



Manado, p. 69. " 

 Leptocephalus hypselosoma, Bleek. Atl. lehth. Mur. p. 124, pi. 37. 



fig. 5. 



Body compressed, rather short, of moderate depth. Head small. 

 Snoiit obtuse. Pectoral fins none. Jaws toothless. 

 a. Type of the species, in very bad state. Celebes. Erom Dr. 

 Bleeker's Collection. 



