222 HELLER AND SNODGRASS 



We have not seen Miiller's figures of E. vermicular is, but his de- 

 scription is so meagre that the two species can be only approximately 

 compared. The coloration is very different, there being in our speci- 

 men no trace of the blackish-brown color of the Philippine form. 



Named for President David Starr Jordan of Stanford University. 



The type was the only specimen taken. 



MEASUREMENTS OF THE TYPE OF Encheliofhis jordani. 



Petrotyx gen. nov. 



Characters. Body not greatly attenuated or compressed; snout 

 blunt, obtusely rounded ; lower jaw included ; teeth small, blunt ; 

 in broad bands in both jaws and on palatines ; in a diamond-shaped 

 patch on vomer ; opercular bones without spines or sharp angles . 

 Vertical fins long, united, caudal not differentiated ; ventral composed 

 of two rays, united for half their length. Snout and the tip of mandi- 

 ble with short thick cilia. Lateral line single, wanting posteriorly. 

 Scales cycloid; present everywhere except on tips of the fins, margins 

 of the jaws, and tip of snout. Gills four, a slit behind the last ; gill- 

 rakers few, short and thick, armed with minute teeth ; pseudobranchiae 

 small. Branchiostegal rays eight. Head without evident muciferous 

 canal openings. Air-bladder large, rounded posteriorly. Six pairs 

 of pyloric caeca. Allied to Catcetyx. 



PETROTYX HOPKINSI sp. nov. 



Pl. XVIII. 



Type. Cat. No. 6344 Leland Stanford Jr. University Museum. 

 Barrington Island. 



Diagnosis. Head five times in length; depth slightly greater; 

 maxillary long, extending much behind eye ; eye small, eight times in 

 head; gill-rakers short, stout, one 4- two; scales one hundred and 

 thirty-five in a series from base of pectoral to end of last vertebra ; 

 dorsal rays one hundred and five ; anal eighty -two ; caudal ten ; ven- 



