1885.] NATURAL SCIENCES OF PHILADELPHIA. 55 



5. Thaiassophryne reticulata. 



Thalassopliryne reticulata Giinther, Proc. Zool. Soc. London, 1864, 150 

 155 (Panama); Giinther, Fish. Central America, 1869, 437, pi. 68, 

 fig. 2 (Panama); Jordan & Gilbert, Proc. U. S. Nat. Mus., 1882, 626 

 (Panama). 



Habitat. — Western Coast of Central America ; Panama. 

 This species is known to us only from the accounts of Dr. 

 Giinther and Professors Jordan and Gilbert. 



2. PORICHTHYS. 

 Porichthys Girard, Proc. Acad. Nat. Sci. Phila., 1854, 141 (notatus = 



margaritatus). 



This genus is remarkable for the development of its mucous 

 pores, or " lateral lines." The number of vertebrae in Porichthys 

 is much greater than in Batrachus, and the skull is somewhat 

 different. 



Analysis of Species of Porichthys. 



Common Characters. — Dorsal spines two ; opercle very small, 

 its posterior part developed as a strong, single spine ; suboper- 

 culum feebly developed, narrowed and not ending in a spine ; 

 no scales on body; spines solid, without venom glands ; several 

 lateral lines on sides of head and body, composed of pores and 

 shining spots, some of these accompanied by cirri ; canine teeth 

 present; vertebras 12 + 31; frontal region depressed, forming a 

 triangular area below level of temporal region, its median ridge 

 very low. Branchiostegals 6 ; interorbital area short, wide, and 

 with shallow grooves. Air bladder more or less deeply divided 

 into lateral parts. Pyloric appendages none. 



a. Abdomen with two longitudinal series of pores, none of them 



accompanied by shining bodies ; vomer with one canine tooth 



on each side. Color above brown, sides and belly silvery; 



dorsal fin with four oblique dark bands ; posterior half of the 



caudal blackish, or with blackish spots; anal with two 



blackish spots posteriorly. Head 4f in total length. 



D. 11-34 ; A. 33. Porosus. 6. 



aa. Abdomen with four longitudinal series of pores ; each of 



which is accompanied by a shining silvery body ; four rows 



of pores on sides of body. Color dark brownish above, 



below with brassy reflections ; dorsal and anal with dark 



margins, a dark blotch below eye. Head 3| in length. D. 



11-37 ; A. 33. 



