488 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



mm.; from 6.2 to 8.3 mm., the third spine is the 

 longest. The coordinates of third dorsal spine 

 length on standard length are plotted on figures 

 73 and 86. 



Anal spines. — II and I. The spines are well 

 formed at 5.4 mm. standard length (fig. 65). 

 There is some variation in comparative lengths, 

 but the second spine appears to be the longest 

 from 5.4 to 6.3 mm., and the first is longest at 

 6.9 mm. and 8.3 mm. The length of the second 

 anal spine of these specimens is illustrated in 

 figure 4. 



Dorsal soft-rays. — 21 at 8.3 mm. standard 

 length, 20 at 6.9 mm. On the specimens of 6.3 

 mm. and smaller the posterior soft-rays have not 

 formed. The second ray is longer than the first 

 on all specimens with unbroken dorsal fins. The 

 third spine of the dorsal averages a greater length 

 than the first soft-ray from 5.4 to 6.2 mm. standard 

 length; at 8.3 mm. the first soft-ray is longer. 

 The coordinates of first dorsal soft-ray length on 

 standard length are plotted in figures 73 and 86. 



Anal soft-rays. — 18 at 8.3 mm. standard length, 

 16 at 6.9 mm. On the specimens of 6.3 mm. and 

 smaller the posterior soft-rays have not formed. 

 The second soft-ray is longer than the first on all 

 specimens and has a slightly greater length than 

 the longest dorsal ray on most specimens. 



Interneural and interhemal spines. — The posterior 

 lateral projections that extend above the body 

 surface along both sides of the dorsal and anal 



soft-ray bases on larger latus and hippos have 

 not protruded above the body surface by 8.3 mm. 



Caudal. — 9 + 8 principal rays; 8 + 8 secondary 

 rays (at 8.3 mm. standard length). Only 6 dorsal 

 and 6 ventral secondary rays are present at 

 6.9 mm. — less than the adult complement of 

 latus or hippos. The number of secondary caudal 

 rays of the 8.3-mm. specimen is within the range 

 of the adult complement of latus and hippos. 

 Segmentation has begun by 5.4 mm. (fig. 65), 

 but branching has not begun by 8.3 mm. (fig. 

 68). Forking of the tail is represented by a slight 

 indentation at 5.4 mm. and is pronounced at 

 8.3 mm. The urostyle remains visible at 8.3 mm. 



Pectoral. — The full complement of rays is 

 present at 8.3 mm. but not at 6.9 mm. The 

 distal end of the fin is rounded at all sizes (figs. 65 

 to 68). The coordinate of pectoral length on 

 standard length of the 8.3-mm. specimen is 

 plotted in figures 74 and 87. 



Pelvic. — The fin is very small and incompletely 

 formed at 5.4 mm. standard length (fig. 65). 

 The full count of rays is present at 6.9 mm. 

 (fig. 67), and segmentation is present on the 

 unbranched rays at 8.3 mm. (fig. 68). 



Body depth. — At corresponding body lengths, 

 the depth at first anal spine is less than the 

 depth at pelvic. The coordinates of body depth 

 at pelvic on standard length are plotted in figures 

 9, 75, and 88. 



Head. — The nostril is not completely divided 



Figure 65. — Caranx sp. (latus or hippos) larva, 5.4 mm. standard length (Gill 7, Reg. 79). 



