no. 360C ODONTODACTYLUS — MANNING 29 



A similar disparity of size in postlarvae has been observed in young 

 specimens of 0. scyllarus. 



Juveniles of 0. brevirostris may also differ from adults in having the 

 rostral plate trapezoidal in shape rather than semicircular; however, 

 the latter shape is more usual. 



I have been unable to detect any differences between adult speci- 

 mens (TL 40 mm or more) from the western Atlantic and the Indo- 

 West Pacific. The type of Gonodactyus havanensis, a male, TL 

 20.0 mm, is illustrated in outline in figure 8. As in most small speci- 

 mens of similar size from the Indo-West Pacific, the carinae of the 

 telson are relatively well developed. The western Atlantic 0. nigri- 

 caudatus cannot be distinguished from specimens of similar size from 

 the Indo-West Pacific, and it, too, must be considered a synonym of 

 0. brevirostris. A more detailed account of the western Atlantic 

 specimens is in press. 



In 0. bremrostris the carina of the lateral tooth may lie parallel 

 with the margin, it may converge distally with the marginal carina, 

 or it may He parallel except for its extremity, which turns and fuses 

 with the marginal carina. The position of the carina is very variable, 

 as noted by Bigelow (1931) in specimens from Hawaii. 



Distribution. — Western Atlantic and Indo-West Pacific, from the 

 western Indian Ocean through Indo-Malaya to Hawaii; in moderate 

 depth, to 424 m. This species fives at greater depths than any other 

 in the genus. 



