NATURAL SCIENCES OP PHILADELPHIA. 195 



August 30th. 



Mr. Lea, President, in the Chair. 



Present thirty-one members. 



The following papers were ordered to be printed in the Proceedings : 



Description of a type of GOBIOIDS intermediat3 between Solinse and 



Tridentigerinae. 



BY THEO. GILL. 

 EVORTHODDS Gill. 



Body elongated, anteriorly subcylindrical, slowly declining to the caudal. 

 Scales regularly imbricated, extending forwards to the eyes ; those of the sides 

 with pectiniform borders ; those of the anterior part of the back cycloid Head 

 thick, abbreviated, subquadrate in profile, above transversely convex, anteri- 

 orly truncated. Eyes large, approximated and wholly in the anterior half of 

 the head. Mouth moderate. Tongue thick and stout, but not wide, anteri- 

 orly free, and with the margin entire. Teeth uniserial, compressed, straight, 

 with parallel borders and emarginated crowns ; those of the lower jaw nearly 

 horizontal. Dorsal fins entirely disconnected ; the first with anterior rays 

 slightly filamentary, the second oblong. Caudal and pectorals rounded. Ven- 

 trals infundibuliform, with the interspinal membrane low. 



This genus is well distinguished by its dentition, and appears to thus con- 

 nect the true Solince, whose teeth are acute, with the Tridenligerince, in which 

 they are tridentiform. The sub-family of Tridentigerince includes two genera, 

 both of which are peculiar, as far as is known, to the Pacific ocean. In Tridenti- 

 ger, Gill, there is behind the row of tridentiform teeth of each jaw, a row of 

 simple acute ones. In Trkenophorus,* Gill, simple teeth only are behind the 

 tridentiform ones of the lower jaw. Both of those genera also differ from 

 Evorthodus as well as from each other in the form of the head. 



EVORTHODUS BREVICEPS Gill. 



The body regularly declines from the first dorsal to the end of the second ; 

 at the former point, the height is a sixth of the extreme length, and the least 

 height is an eleventh of the same. From the dorsal to the snout, the outline 

 is evenly curved. 



The short head constitutes about a sixth of the extreme length ; its greatest 

 breadth and width are nearly equal to each other, and each bears a proportion 

 to the length of about thirteen to seventeen. 



The eyes are situated entirely in the anterior half of the head ; the diameter 

 of an orbit equals a third of the head's length; the interorbital space is 

 narrow. 



The mouth is extended very little backwards. 



The anal fin commences under the second or third ray of the second dorsal, 

 and has (sometimes) one more ray than that fin. 



The caudal, when expanded, has a rounded margin, and forms a fourth of 

 the total length. 



1 1 



Dvi, 1, 9-A1, 10-0 5,7,8, 6, P 17, V, I, 5+5-J-l. 

 1 1 



The color is light brown with irregular blackish blotches along the sides ; at 

 the base of the caudal fin are two black spots, one above the other, alternating 



* The word Tricenophorns having been previously used by Rudolphi for a genus in 

 Helminthology, it is proposed to substitute for the ichthyic genus, ihe name of Trianopho- 

 richlhys, and for the species that of T. trigonocephalies. 



1859.] 



