Crustacean Goi'if Sicyonella, Borraddile. 2')'.) 



lobe. It now socms liiglily prol)ablo, however, that the 

 Torres Straits specimen is inimatuie*. Its length, 30 mm,, 

 is less by some 5 mm. than that of the smallest male from 

 the Indian Ocean, and it resembles the females and differs 

 from the males in having (1) the eyes less dilated, (2) the 

 third cheliped less slender and with shorter carpus, and (3) 

 the inner flagellum of the antennules only slightly thickened 

 at the base; in tlie miles, the basal part is considerubly 



1^ 



A B 



Sici/o)i(lln mnldivensis, adult male (co-typo). A. Poiasnin, seen from 

 iu front. 13. Apicil portion of same, from beliind. 



thickened and excavated on the inner and npper side, M'here 

 it bears a row of strong sjjines. The differences in the pro- 

 |)()iti<)ns of the eyes and third chelipeds are shown by the 

 following measurements (in millimetres) : — 



Indian Ocean. Torres Strait;*. 



6. 2- 6. 



Total leng-lli 30 29 '20 



Ocnlar pedimcle : 



Diameter at base -4.") -48 -34 



Dia in. of corneal area .... l-li' Tti '56 



Tliird cheliped : 



("ari)iis, k-nfjth '.\-2 2 88 2-24: 



Propodus, leiirrtli 22 208 1-0 



„ diameter -13 -18 -16 



Dactvliis, Ient,nh -02 -08 -48 



^Viiile it is thus fairly clear that ApJiarcocaris eleqans 

 must be regarded as a synonym of Sicyonella maldwensis, it 

 is to be noted also that the distinctions which 1 pointed out 



The chanpres in thepeta.9ma of <Ser^es^t's during growth have recently 

 heen described by Ste])liensen [''The Copulatory C)r<ran (Peta.^ma) of 

 Siryvdfs iif/i/(t.r ('Siiini)son), II. .1. II.," Mindesluift lor Japetiis iSteen- 

 strup, K(/jbonliavn, Iiil3, pp. 1 o (.«up. cojiyjj. 



