48 



CALIFDllNIA ACADKMY OF SCIENCES 



> in Hundredths of length without Caudal. 



Species 



Locality 



Length wiihout caudal, 

 in mm 



Head 



Depth 



Orbit 



Maxillary 



Snout 



Greatest lcn_i;;th from pre- 

 opercular ridge to gill- 

 opening 



Number of dorsal rays.. 



Number of anal rays 



Number of scales 



CETENC.RAULIS MYSTICETUS 



Panama 



149 

 36 



31 



8 



21 



4 



14 

 15 

 22 



42 



153 

 36 

 30 

 7J 

 21^ 



4 



15 

 15 

 23 

 40 



144 



37 



31 



7i 



22 



4 



15 

 15 

 23 

 43 



«45 



37 



29 



8 



2>i 

 4\ 



14 

 15 

 22 



43 



152 

 35i 

 3oi 

 7i 

 21 



4 



15 

 14 

 22 



42 



CETENGRAULIS EUENTULUS 



South Atlanlit 



104 



33 



32 



9 



20 



5 



12 

 15 

 23 

 41 



90. Cetengraulis engymen Gilbert d- Pierson. 



Cetengraulis cngymcn Gilbert & Pierson (Jordan and Kvtrmann, 1898, p. 2815). 



This species differs from C. mysticclus in the much narrower union of the gill membranes, the 

 less numerous gill-rakers, and in the longer snout. Head 3 to 3.3 in length; depth 4 to 4.9; eye 4 in 

 head; dorsal 14 or 15; anal 20 to 23; vertebrae 41. Body compressed, fusiform, not so deep as in 

 vtysticetus or cdcntulus. The dorsal and ventral outlines are about equally and regularly curved in the 

 larger specimens; in the smaller specimens the ventral contour is more nearly straight. Belly trenchant, 

 but not carinate nor serrate; caudal peduncle moderate, its depth being contained 1.5 times in its 

 length. Head similar to mysticctus; the snout longer, contained 5.5 to 7 times in head, li times in 

 eye (the snout is contained 8 to 9 times in head, in mysticctus). Both jaws bear minute teeth, those on 

 the maxillary largest. Rranchiostegal membranes united for only | to J of the distance between tip 

 of mandible and mandibular articulation; wholly free from the isthmus. Ti]5 of manditilc directly 

 beneath the anterior border of orbit. Gill-rakers long, nine-tenths diameter of eye, 20 to 30 on the 

 upper limb, 25 to 30 on the lower limb; in five examples as follows, 25-(-30, 27-I-25, 30-(-26, 25-I-30, 

 23-I-29 to 20-I-25. 



The origin of the dorsal is midway bet\veen base of median caudal rays and a point \arying 

 between front and middle of the eye. Insertion of anal below the posterior fourth or third of the dorsal, 

 its length equaling the distance from the jX)sterior border of the eye to insertion of pectoral. The 

 pectoral is short, 2^ to 2^ in head, failing to reach the insertion of the ventrals by half or nearly half 

 its length. Caudal deeply forked, its median rays 2\ to 3 times in head. 



Color uniformly silvery, with a distinct, well defined lateral silvery Ixuid, extending from up[>er 

 angle of gill-op)ening to base of caudal; its greatest width cfjuals the diameter of orbit, becoming 

 narrower on caudal peduncle. 



Length 38 to 57 mm. 



