338 GOBIES OF THE PHILIPPINES 



Key to the genera of Trypauchenidse. 



a 1 . Ventrals completely united, forming a funnel-shaped disk; teeth slender, 



in several rows, the outer ones enlarged Trypauchen. 



a 2 . Ventrals with notched tip or separated to base. 

 6 1 . Ventrals separated to base; teeth as in Trypauchen. 



Trypauchenichthys. 

 b 2 . Ventrals united but notched posteriorly. 



c 1 . No canines Ctenotrypauchen. 



c 2 . Canines present in both jaws Amblyotrypauchen. 



Genus 75. TRYPAUCHEN Cuvier and Valenciennes 



Trypauchen CUVIER and VALENCIENNES, Hist. Nat. Poiss. 12 (1837) 

 116. 



The entire fish is strongly compressed laterally, the body 

 elongate, tapering from before backward, the head rather short 

 but deep, with a very heavy, deep lower jaw which is more or 

 less protruding; above opercles is a deep blind pit not com- 

 municating with gill cavity ; the eyes lateral, minute, in shallow 

 pits, covered with skin and more or less invisible; teeth in two 

 or three rows in each jaw, the outer row enlarged; the dorsals 

 continuous, the sixth spine of first dorsal separated by an in- 

 terspace from the anterior five and from second dorsal ; the 

 anal and second dorsal many-rayed, confluent with caudal ; ven- 

 trals united to form a disk; without spines; scales small, cy- 

 cloid; the gill openings wide, the isthmus broad. 



170. TRYPAUCHEN VAGINA Bloch and Schneider 



PLATE 26, FIG. 3 



Trypauchen vagina BLOCK and SCHNEIDER, Syst. Ichth. (1801) 73, 

 No. 20 ;| CUVIER and VALENCIENNES, Hist. Nat. Poiss. 12 (1837) 115, 

 pi. 351; GUNTHER, Cat. Fishes Brit. Mus. 3 (1861) 137; DAY, Fishes 

 of India (1878) 320, pi. 68, fig. 2; SEALE, Philip. Journ. Sci. D 9 

 (1914) 77; RENDAHL, Arkiv Zoologi 16 (1924) 30. 



Dorsal VI, 1-40 to 49; anal, I, 40 to 48; there are 72 to 76 

 scales in a longitudinal series in my specimens, 80 to 85 accord- 

 ing to Day. 



The entire fish strongly compressed, the dorsal and ventral 

 profiles tapering posteriorly from just behind head to base of 

 caudal, the depth 9 to 9.2 in length ; the head appressed dorsally, 

 with a bony median ridge, short, deep, and heavy anteriorly, 

 the depth 5 to 6.25 in length; the snout convex, short, 3.7 to 

 4 in head; the eyes invisible, covered with skin, their presence 

 indicated by a dark spot in the bottom of the shallow orbital 

 pit; the width of the high bony interorbital ridge about f the 



