GILSEKT ANi) StARKS — flSHES Ot" PANAMA feAY 

 Measurements in Hundredths of Length without Caudal. 



191 



Length in mm 



Length of head 



Length of snout 



Length of maxillary 



Diameter of orbit 



Interorbital width 



Greatest depth 



Depth of caudal peduncle 



Length of first dorsal spine 



Length of second dorsal spine 



Length of third dorsal spine 



Length of fourth dorsal spine 



Length of twenty-sLxth dorsal spine. 



Length of first anal spine 



Length of second anal spine 



Length of longest anal ray 



Length of caudal fin 



Length of ventral fin 



Length of pectoral fin 



337. Hypsoblennius piersoni sp. no v. 



Plate XXXII, Fio. 60. 



Resembling H. gentilis and H. gilberti, but with shorter spinous dorsal and much longer soft 

 dorsal and anal. 



Head 4; depth 5. D. IX, 25; A. II, 24; P. 16; V. I, 3.* 



The form is elongate, with very bluntly rounded snout, the mouth subinferior, as in the other 

 species mentioned. There is a slender nasal tentacle, longer than in its nearest relatives. The orbital 

 tentacle is as long as diameter of eye; above a short basal stalk, it is finely dissected to form five or six 

 slender filaments, one or more of which may be branched. The mouth is very small, largely trans- 

 verse, reaching posteriorly to a vertical midway between front and middle of pupil. No posterior 

 canines. Gill-opening extending below to opposite lower edge of pectoral base; from this point, 

 the margin of the branchiostegal membrane can be traced across the throat, but it is nowhere free. 



* In six specimens of H. gilberti from San Diegn, the fin-formula stands: 



Dorsal XII, 17 XII, 18 XU, 18 XI, 19 XII, 19 XII, 19 

 Anal II, 18 II, 19 U, 19 II, 19 II. 19 II, 20 



In one speciruen of H. gentilia from San Dtego, we find D. XII, IG; A. II, 18. 



