PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 153 



with irregularly undulating horizontal lines, to form a graceful, irregular 

 network). 



Scales arranged in 40 transverse and 11^ longitudinal rows. In H. 

 sardina 40 (38-42 according to Giinther); in ^. callolepis 38, as nearly 

 as can be ascertained from specimens partly denuded of scales, and 10^ 

 longitudinal rows. 



Lower jaw moderately long, its length included nearly 3 times in 

 distance from snout to origin of dorsal, and equal to half the distance 

 from tip of snout to the posterior margin of the operculum (in H. clu- 

 peola and in H. sardina equalling half length of head as measured above, 

 in S. callolepis less than half; in H. calloJepis contained about 2§ times 

 in distance from tip of snout to posterior margin of operculum, in H. 

 sardina 2J^ times, in B. pensacohv nearly 3 times). 



The maxillary extends behind the front margin of the orbit, as in all 

 species of the genus which have been examined. 



Teeth very small, inconspicuous in the jaws. A large patch of asper- 

 ities on the tongue nearly covering its upper surface (iu 11. callolepis 

 this patch is much smaller, lanceolate in form); cheeks and opercula 

 veined prominently. Gill-rakers fine, closely set, shorter than the eye, 

 about 50 on one side of the first arch (in H. callolepis they are thick, 

 stiff', wiry, not closely set, about 40 in number; in R. sardina they are 

 much the same as in H. callolepis iu shape and arrangement, and the 

 number does not exceed 42 ; in S. clupeola they are somewhat shorter, 

 and number at least 50). 



Eye large, its diameter longer than snout, contained about 3 times 

 in the length of the head (in H. sardina the length of the snout nearly 

 equals the eye, and in if. callolepis this is also the case, the diameter of 

 the eye, however, being still about ^ of the length of the head). 



Dorsal fin inserted midway between snout and base of caudal, the 

 ventral also originating at a point equidistant from snout and origin of 

 upper caudal lobe (in R. cliqieola the ventral is placed midway, while 

 the dorsal is very slightly nearer to the snout than to the base of the 

 upper caudal lobe; in R. callolepis the ventral is midway, while the 

 dorsal is nearer to the base of tlie upper caudal lobe by a distance 

 nearly equal to the diameter of the pupil of the eye ; in R. sardina the 

 ventral is nearer to the snout, the dorsal nearer to the base of the 

 superior caudal ray by a distance nearly equal to the diameter of the 

 orbit). 



There are 12 abdominal scutes behind the base of the ventral fin, as 

 is the case also with R. callolepis and R. sardina, R. clupeola having 14. 



A high shield of scales enclosing the base of the dorsal and anal 

 fins. 



D. 10; A. 17; V. 8; P. 15; C. 10 {R. callolepis ^vas D. 17; A. 17; P. 16: 

 C. 15). 



Two specimens, :N'o. 22,831 (29), were obtained by Mr. Stearns. 



