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more than twice as broad as the posterior margin. The distance between the anterior pair of 

 spinules and the posterior margin is in proportion to the length of the telson as 0,43:1; these 

 spinules being situated even a Httle more forward than in my figure 2 a (1. c), in accordance 

 with the large size of this specimen. 



Brachium of small cheliped more slender than that of the large, the upper margin and 

 the infero-external margin terminate in an acute, pointed tooth, but instead of the posterior 

 tooth that is observed on the infero-external margin of the merus of the large cheHped, there 

 is a small, obtuse prominence. Carpal segments of the left leg of the 2°'^ pair (the right is 

 missing) 3,3 mm., o,S mm., 0,7 mm. 0,65 mm. and 1,12 mm. long; the chela is 1,8 mm. long 

 (palm 0,8 mm., fingers i mm.). In this full-grown specimen the first segment appears even very 

 slightly longer than the four following taken together. 



In the three posterior legs the ischium is unarmed. In my original description nothing is 

 said about the eggs: in this specimen they are very numerous, ovoid, i mm. long, 0,6 mm. thick. 



The egg-bearing female from Stat. 33 is 24,5 mm. long, the ova are 0,9 mm. long, and 

 the telson is more narrowed posteriorly, being 4"/3-times as long as its posterior margin is broad. 



In Syii. carinatiLS the proximal extremity of the S-like curved, outer margin of the 

 scaphocerite is produced into a spine: in the adult female from Amboina this spine is rather small 

 and directed outward, in the young male from Stat. 33 it is well-developed and directed straight 

 forward. This spine is often broken off. 



In the young specimen, long 12 mm., from Stat. 315 the rostrum reaches almost the 

 end of second antennular article, but the rostral carina only extends to the posterior fourth of 

 the carapace. The first carpal segment of the 2°<^ legs is much shorter than the sum of the 

 four following. 



Remarks. The specimen which was referred by Zehntner to this species, was 

 examined by me and no doubt belongs to this species. The rostrum that appears somewhat 

 asymmetrical, is apparently regenerated. The species, however, which was referred by Pearson 

 to Syn. carinattis, is certainly another, the second antennular article is hardly shorter than the 

 first, the telson has a quite different form etc. 



General distribution: Amboina (de Man, Zehntner). 



f 4^'. Synalpheus car hiatus (de Man) var. binongcensis de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. iii. 



Stat. 220. November 1/3. Anchorage oft" Pasir Pandjang, West coast of Binongka. 55 m. 

 Coral sand, i ova-bearing female, collected on a Coiiiatula. 



This specimen, 25 mm. long, is described as a variety, because the ovoid eggs are 

 larger, 1,2 mm. long, and less numerous than those of the female taken at Amboina, which 

 was referred to the typical species. The rostrum, reaching almost to the end of second anten- 

 nular article, is continued to near the posterior margin of the carapace, but, different from the 

 typical female from Amboina, is not notched at the limit between the gastric and cardiac regions. 

 The carinae of the orbital spines that are half as long as the rostrum, slightly convergent, 



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