134 (iOBIID^- 



2. Amblyopus gracilis. 



Amblyopus gracilis, Ciiv. 8f Val. xii. p. 106. 



gracilis, Sleeker, Verhand. Batai\ Genootsch. xxii., Blcnn. en Gob. 



p. 38. 



D. -A. A. 47-49. 



47-49 



The length of the head is contained ten times and a half or eleven 

 times and a half in the total length, or four-sevenths of the distance 

 between the root of the ventral and the vent. Pectoral veiy short ; 

 dorsal and anal fins more or less continuous with the caudal, and 

 enveloped in thick skin ; caudal rather short. The lower jaw with 

 small barbels. Body naked. 



Coast of Pondicherry. Estuaries of Surabaya. 



a. East Indies. Presented by G. R. Waterhouse, Esq. 

 6, c. From the Haslar Collection. 



3. Amblyopus bracbygaster. 



The length of the head is one-ninth of the total (without caudal 

 fin), and only a little less than the distance between the base of the 

 ventral and the vent. Body subcylindrical anteriorly, compressed 

 posteriorly, not very elongate, its greatest depth being one-fourteenth 

 of the total length (the caudal fin included). Teeth strong (about 

 sixteen in the upper jaw and six in the lower) ; skin of the chin 

 folded, and with short barbels. Eyes invisible. The vertical fins 

 are enveloped in thick skin ; the dorsal and anal are separated from 

 the caudal by a deep notch ; caudal rhomboid, of moderate length ; 

 pectoral short, not quite half the length of the ventral. 



East Indies. 



a. Adult. From the Collection of the Zoological Society. 



6, c. Adult. East Indies. Presented by G. K. "Waterhouse, Esq. 



inches, lines. 



Total length 14 



Height of the body 1 



Length of the head 1 5 



Distance between the base of the ventral 



and the vent 1 7 



Length of the caudal fin 1 1 



Total length of the smallest specimen .... 6 



The anterior series of strong teeth is separated from the band of villi- 

 form teeth by a narrow interspace covered by the mucous membrane. 

 The pharyngeal bones are provided with teeth so minute, that they 

 may be felt rather than seen ; the upper phaiyngeals are obtusely 

 ovate ; the two lower ones are separate from each other, and form 

 together a triangle. The setiform lamellae on the concave side of the 

 branchial arches are very short, and not toothed. There are four 

 gills ; a slit behind the fourth ; pseudobranchiae none. 



