GILBERT AND STAKKS — FISHES OF PANAMA BAY 

 Measitrciiioits in Ifundrcdths of Length 'a<ithoiit Cauda/. 



113 



Species 



Locality 



Length without caiuhil in mm 



Head 



Depth 



Eye 



Preorbital (least depth) 



Interorbital (bone) 



Snout 



Maxillary 



Pectoral 



Third dorsal spine 



Second anal spine 



Ventral 



Caudal 



Caudal peduncle (height) 



HUACIIVSOMllS 



Pan:i 



La Paz, 

 L.C. 



TAIUUNUS 



Galapagos 

 Islands 



216 



3ii 

 42t 



8 

 III 



8 



i7i 

 12J 

 36 



13 

 6i 



22 



31 

 9 



Family GERRID^. 



210. Eucinostomus californiensis {Gill). 



Diaptents dowii GiLL, 1863, p. 162. 



We found this species very common at Panama, and carefully selected a 

 series of about twenty specimens, with a view to exhibiting all the variations to which 

 it is subject. We have also a large number of specimens from other localities. 



Our extensive series seems to prove E. dowii to be invalid. It is alleged to 

 differ from this species in having the maxillary groove " linear " instead of " broad 

 and semi-oval "; in having the scales 5-47-10 instead of 6-44-13, and in having the 

 " spinous dorsal blackish at the margin " rather than " fins immaculate." 



Our specimens show all intermediate stages of the maxillary groove, from 

 linear to broadly U-shaped. In some individuals the groove is as wide at the anterior 

 or open end as at the middle, but in most of them it is more or less constricted ante- 

 riorly by the encroachment of the scales on each side. In one specimen the groove 

 is wholly closed in front by the meeting of these scales. The scale-formula in our 



