216 



HELLER AND SNODGRASS 



MEASUREMENTS OF Gobius gilberti. 





ARBACIOSA TRUNCATA sp. nov. 



Pl. XIV. 



Gobiesox zebra GILBERT, in part, Proceedings United States National Museum, 



xxni, 1890, p. 452 (Duncan Island). 



Type. Cat. No. 6341 Leland Stanford Jr. University Museum. 

 Tagus Cove, Albemarle. 



Diagnosis. Incisors broad, the median ones of both jaws even- 

 edged, truncate ; a single enlarged canine behind the incisors ; dorsal 

 and anal fins with six or seven rays ; eye large, one and one half times 

 in interorbital width ; vertebrae thirty. Color, light olive-yellow, 

 vermiculated and spotted above with darker; a blackish humeral 

 spot ; four pinkish transverse bands on dorsum in life. 



Description of the Type. Head three and one third in length ; 

 depth six and two thirds ; eye five in head ; interorbital three and three 

 fourths; disc one and one fourth; D. 6; A. 7. 



Horizontal profile of body narrow, head little wider than rest of body, 

 opercles bulging somewhat on sides ; snout rounded. Dorsal profile 

 low, rising slightly to middle of back; ventral profile horizontal. 

 Mouth small, terminal ; both jaws armed with six broad incisors, the 

 four median ones above and the two median ones below truncate, 

 unnotched, their edges even ; lateral teeth tridentate with rounded 

 lobes, the middle lobe projecting above the lateral ones ; both jaws 

 with an enlarged, somewhat recurved incisor separated by a slight 

 diastema from the posterior incisors. Gill-raker short, slender, seven 

 on lower limb of arch. Opercular spine strong. 



Dorsal fin beginning slightly in advance of anal ; both fins short, 

 similar, rounded, their anterior rays highest. Pectoral short, rounded, 

 with broad bases, length two and one half in head. Caudal fin broad, 

 rounded, length one and one half in length of disc. 



