97 FISHES OF SINALOA. 469 
162. Menticirrus simus Jordan. 
This species was described from specimens obtained 
by Dr: Gilbert at Mazatlan. A single very small one was 
obtained by us in the surf north of the city. 
163. Menticirrus panamensis (Steindachner). 
Taken by Dr. Gilbert at Mazatlan; not seen by us. 
164. Menticirrus elongatus (Giinther). VERRUGATA. 
This species is very common in the surf on the sandy 
beaches about Mazatlan. Specimens were also obtained 
by Dr. Gilbert. Elsewhere it has been recorded only 
from Chiapam, whence came Dr. Giinther’s original 
types. 
Family GERRID. 
165. Eucinostomus californiensis (Gill). Mojarra 
CANTILENA. (Dapteris californiensi’s and gracilis 
Gill. ) 
Excessively common in the estuary, being by far the 
most abundant species, not excepting the White Mullet. 
It is rarely used as a food on account of its small size, its 
length when adult ranging from five to ten inches. The 
second interhemal bone in this species is developed in a 
very singular manner, being short, much expanded and 
hollow, the broadly open upper end being occupied by 
the posterior part of the air-bladder, the structure being 
the same as in the genus Ca/amus, but more highly de- 
veloped, the bone being shorter and. more largely ex- 
cavated. This structure is seen also in FAucénostomus 
gula, harengulus, and probably others. As Gerres gula 
(= argenteus )is the type of the genus EHucznostomus, this 
structure may be held to define that genus as distinct from 
Gerres. ‘There can be no question as to its generic im- 
portance. In Gerres proper, the second interhamal is 
