814 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



uiul 10 l)i't\vo(Mi the liittcM- iind iniddlo of holly; pharvng-eal teeth 5- 

 widtli of hoiid. i'i in its length; snout, 41 in head; eye, 3i; intei-orh 

 s])ac('. '1\\ pectoral, 1|; ventral, Itf. 



liodv ratluM- short, deep rli()nd)()id, and compressed. Head small, 

 compressed and l)luntly pointed; upper prohle of head concave over 

 the eves; snout less than eye. rounded al)ov(> and l)luntly pointed; eyfi 

 ratliei- hii'o'e. anterior; mouth small. ohli(pie. the maxillary protractiki 

 and I'cariiiny Ixdow the nostrils, hut not to the ant(>rior edge of eye: 

 lips rather thin; pharyngeal teeth compressed, with a narrow grindinjii 

 surfac(^ the sides serrate, and the tips slightly hooked; nostrils clos( 

 togetlier on the snout in front of (\ve; interorhital space and top oi 

 head hi-oad and slighly convex. Gill openings rather large; gill-i'akeri^' 

 small and weak; pseudobranchial present. Intestine long, with man\ 

 coiu'olutions. Pei'itoneum hiack. 



Fig. 1. — I'sKiDoi'ERiLAMPrs typus. 



Scales rather small, and all more or less very narrowly imhricatedS 

 so that they are much deeper than long; no pectoral Hap; ventral Ha] 

 present. 



Origin of dorsal nearer l)ase of caudal than tip of snout, the anterioi 

 rays th<> highest, the base of the tin about equal to the head, and the thirc 

 rudimentary ray stronger than the others; anal beginning about mid- 

 way between origin of pectoral and base of caudal, or a little before the 

 middle of base of dorsal, and its base a trifle more than head withoiil 

 snout; caudal emarginate, the lobes pointed; pectoral reaches to withii' 

 a short distance of ventral; origin of ventral well before that of tlu 

 dorsal, or nearer tip of snout than base of caudal, and reaching within 

 a short distance of origin of anal. Caudal peduncle compressed, and 

 its least depth a little over 2 in head. Lateral line slightly decurved 

 and continuous. 



