48 



CALIFOKNIA ACADEMY OF SCIENCES 

 Measurements in Hundredths of Length ivithout Caudal. 



Species 



Locality 



Length without caudal, 

 in mm 



Head 



Depth 



Orbit 



Maxillary 



Snout 



Greatest length from pre- 

 opercular ridge to gill- 

 opening 



Number of dorsal rays.. 



Number of anal rays 



Number of scales 



CETENGRAULIS MYSTICETUS 



Panama 



149 

 36 



31 

 8 



21 

 4 



14 

 15 



22 



42 



153 

 36 

 30 



211 



15 

 15 

 23 

 40 



144 



37 



31 



i\ 

 22 



4 



15 

 15 

 23 

 43 



145 

 37 

 29 



8 



2li 



14 

 15 

 22 



43 



152 

 35i 

 3oi 



7i 

 21 



4 



15 

 14 

 22 



42 



CETENGRAULIS EDENTULUS 



South Atlantic 



106 

 34 



3ii 



8 

 20 



5 



12 



14 

 24 

 39 



96 

 33 

 33 

 9 

 20 



5 



12 



14 



24 

 40 



lOI 



33 



33 



8 



19 



5 



12 

 15 

 23 

 41 



109 



33 



34i 



8i 

 20 



5 



1 1 

 15 

 23 

 40 



104 



33 

 32 



9 



20 



5 



12 

 15 



23 

 41 



90. Cetengraulis engymen Gilberl <k Pier son. 



Cetengrarilis engyme^i Gilbert & Pierson (Jordan and Evermann, 1898, p. 2815). 



This species differs from C. mysticctus 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 

 mysticctus or edentuhis. 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, i^ 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. Branchiostegal membranes united for only | to | of the distance between tip 

 of mandible and mandibular articulation; wholly free from the isthmus. Tip of mandible directly 

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

 upper Umb, 25 to 30 on the lower limb; in five examples as follows, 25-J-30, 27-|-25, 30-f-26, 25-I-30, 



23-J-29 to 20-)-25. 



The origin of the dorsal is midway between base of median caudal rays and a point varying 

 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 posterior 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 band, extending from upper 

 angle of gill-opening to base of caudal; its greatest width equals the diameter of orbit, becoming 

 narrower on caudal peduncle. 



Length 38 to 57 mm. 



