156 On Freshicater Fishes from British Neio Guinea. 



I have named this species after Prof. Max Weber, in 

 recognition of his work on the fishes of New Guinea. 



Perhaps the most nearly allied species is R. goldii, ]\[acleay, 

 from the same locality, which has been stated by both 

 Macleay * and Perugia f to have six spines in the first dorsal 

 fin, a number found in only one of the specimens described 

 above ; moreover, in R. goldii the black lateral band is said 

 to run above and below the eye. 



The skeleton is extremely similar to that of more typical 

 Atherinidte, and the skull, pectoral arch, and vertebral 

 column present few features of special interest. The vertebra? 

 number 35, 20 preecaudals and 15 caudals. The pelvic 

 bones are suspended from the third and fourth pair of 

 ribs ; the last eleven pairs ot ribs meet ventrally and support 

 the basalia (interhKraals) of the anal fin, as in the Ophio- 

 cephalidas. 



Eleotris {^Caulichthys) moncldoni. 



Depth of body 3| in the length, length of head 4;^. 

 Breadth of head 2 in its length. Snout a little shorter than eye, 

 the diameter of which is 4 in the length of head and a little less 

 than the interorbital width. Mouth small, oblique, the lower 

 jaw slightly projecting, the maxillary not extending to below 

 the eye. Head covered with scales, which become much 

 smaller anteriorly. Scales 29/12. Dorsal VI, I 8 ; origin 

 of spinous dorsal equidistant from exti-emity of snout and 

 base of last soft ray ; second spine the longest, a little longer 

 than the third and g the length of head ; soft fin highest 

 anteriorly, the first branched ray a little more than § the 

 length of head, the last ^ length of head. Anal I 10. Pec- 

 toral nearly ^ the length of head ; ventrals as long, not 

 extending to the anal. Caudal truncate. Least depth of 

 caudal peduncle twice in its length. Each scale of the body 

 yellowish, with a broad dark brown margin ; dark edges of 

 the scales forming a narrow blackish bar on the base of 

 pectoral ; vertical fins blackish, the caudal with small light 

 spots. 



A single specimen, 73 mm. in total length, from Agajambo, 

 presented to the British Museum by (J. A, W. Monckton, 

 Esq. 



Closely allied to E. guentheri^ Blkr., which has a longer 

 snout and larger eye. 



* Proc. Linn. Soc. N. S. Wales, viii. 1883, p. 269. 

 t Ann. Mus. Genov. (2) xiv. 1894, p. 548. 



