BKACIWTRA. 371 



Camposcia retusa, LATREILLE, 1829- A. I, p. 184. 



Locality : Pearl banks, Gulf of Manaar, one specimen. 



Description; Male, apparently adult, C.I. = 23'50. It has the broad sternum 

 (KLUNZINGER, pi. i., fig. 1) and slender cheliped described for males of this species, 

 giving them a curiously female appearance. The sternum, though broad in the male 

 of this species, is not so broad as in the female. 



Apocremnus indicus, ALCOCK, 1895 A.I, p. 188 ; A.Invest., pi. xx., fig. 1. 



Localities : Coral reefs, Gulf of Manaar, sixteen specimens ; south of Galle, deep 

 water, six specimens ; Gulf of Manaar, deep water, three specimens. 



Description: In an ovigerous female C.I. (excluding rostrum) = 7 '00. A gastric 

 spinule is present this is figured by ALCOCK, but omitted from his description. 



A post-ocular spinule is figured by ALCOCK in his ventral view of the male, but is 

 said by him in his description to be absent. The description not the figure is 

 correct for the present specimens. 



There is evidence in the present specimens that the male of this species is 

 facultatively dimorphic. The series includes what I believe to be examples of young, 

 non-breeding, and breeding males the latter I judge to be of the " low" type. 



Xenocarcinus tuberculatus, WHITE, 1847, var. alcocki, nov. -A. 1, p. 192. 



Locality : Dutch Modragam Paar, one specimen. 



Description: An ovigerous female. C.I. (excluding rostrum) = 12*50; Bost.l. 

 T-C.l. = 0'32. The present specimen agrees with A. MILNE-EDWARDS' fig. 1 (' Archiv. 

 du. Mus.,' viii., 1872, p. 253, pi. xii., figs. 1 to Ig) in character of its legs, and is fairly 

 intermediate in carapace-character between this and WHITE'S " type '-specimen in 

 British Museum which is figured by MIERS (' Zool. Erebus and Terror,' Crust., p. 1, 

 pi. iL, figs. 1 to le). It thus agrees in general appearance with ALCOCK'S figure of a 

 specimen from Andamans or from Ceylon, but the rostrum is narrower anteriorly and 

 so more conical. A close examination of the carapace surface reveals some obsolescent 

 tubercles in the position of those seen in A. MILNE-D WARDS' fig. 1, but are not 

 sufficiently developed to affect the general appearance, which is due rather to nine 

 swellings as in WHITE'S " type "-specimen ; they are not, however, so strongly 

 developed, so conical, nor so pointed as in the latter, and in particular the gastric and 

 cardiac eminences are very ill-developed. 



Remarks. No second example seems to have been described which is in agreement 

 with WHITE'S " type "-specimen, (female) of A^. tuberculatus. I have examined the 

 five British Museum specimens from Cape Howe, for which MIERS created X. depressus 

 in 1874 (reference as above), and find that they come into the series figured by 

 A. MILNE-EDWARDS; one of them in particular is well represented by his fig. 1. 

 CALMAN states (p. 34) that his Murray Island male is in fair agreement with the 

 same figure. 



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