DR. GUNTHER ON THE FISHES OF CENTRAL AMERICA. 437 
STi gyi este sg eve Recetas ae pale ho oni n ta waite a 54 
ene thuotathegn cadre tet actetusens cic. fclSee) si svn sciienaacias 16 
With OtetnerinCalumemaameacrp rs saci sa x sels scioadomanliekiclddece 14 
Men thpot tae Mea dy wecase soe nehits 4 paras 50s «lin seles opie once 10 
Diamctero tt heleye ten seeuc ect sith ac feacinc0 5h laFeesact ence 1 
Benethy of te Camda, onc cavehwsesiecscevsesssseasscnveas 8 
Ofsihewvemtr alle tim pase ot sclactact od sscioe seen ssencch 7 
93. THALASSOPHRYNE RETICULATA. (Plate LXVIII. fig. 2. 
Ginth. Proc. Zool. Soc. 1864, pp. 150, 155. 
Deyaj24s (ACA <Vud2. Po 16. 
The length of the head is two-sevenths of the total length (without caudal). ‘The 
teeth on the palate are in a single series, very short, obtuse, incisor-like. Pectoral 
very large, extending backwards to the sixth anal ray. Head, body, and fins brown. 
with a network of yellowish lines; vertical and pectoral fins with a white margin. 
In other respects this species agrees with 7. maculosa; so that we may refer to the 
description of that species given above. : 
Three specimens were found by Messrs. Dow and Salvin on the Pacific coast of 
Panama . the largest is 13 inches long. 
In this species I first observed and closely examined the poison-organ with which 
the fishes of this genus are provided. Its structure is as follows :— 
1. The opercular part.—The operculum is very narrow, vertically styliform, and very 
mobile; it is armed behind with a spine, 8 lines long in a specimen of 10} inches, and 
of the same form as the venom-fang of a snake; it is, however, somewhat less curved. 
being only slightly bent upwards; it has a longish slit at the outer side of its extremity, 
which leads into a canal perfectly closed, and running along the whole length of its 
me 
Fig. 1. Hinder half of the head, with the 
venom-sac of the opercular apparatus in _ 
situ. * Place where the small opening 
in the sac has been observed. a. La- 
teral line and its branches. 6. Gill- 
opening. c¢. Ventral fin. d. Base of 
pectoral fin. ¢. Base of dorsal fin. 
Fig. 2. Operculum, with the perforated 
spine, 
interior ; a bristle introduced into the canal reappears through another opening at the 
