67G 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



are appressed more closely to the margin of the carapace. The e^^es 

 have approached nearer together but are still not fused, although the}" 

 are nearly in contact with each other. The dorsal surface of the car- 

 apace shows the single posterior groove between the first and second 

 segments, the l)eginnings of the lateral longitudinal grooves, and the 



transverse grooves dividing 

 the lateral areas. Otherwise 

 the surface is smooth and with- 

 out markings. The general 

 appearance of this larva is so 

 radically different from that 

 of the adult that at tirst it was 

 supposed they were separate 

 species. But there is no differ- 

 ence to be detected in any of 

 the appendages save the swim- 

 ming legs, where, as already 

 stated, the rami have but two 

 joints instead of three. 



This, however, is only an- 

 other evidence of the larval 

 condition and not one of spe- 

 cific difference. Kroj^er, in 

 his second account of the 

 genus, called attention to the 

 very diverse modifications of 

 form among the females, 

 which he declared could be 

 referred with certainty " to 

 the different degrees of devel- 

 opment. He also inferred that 

 the females of caiidatus do not 

 reach full maturity until they 

 are at least 85 per cent of their 

 ultimate size. Such an infer- 

 ence is well substantiated by 

 the developmental forms here 

 presented. 



Another young female, the second of the larvae obtained from Cey- 

 lon, measured 3.5 mm. in length. At this stage the carapace has 

 enlarged even more, being now five-sevenths of the entire length 

 (fig. 3). The second thorax segment has widened with the carapace 

 and also shortened somewhat. It still projects with a shallow and 

 uniform curve into the posterior portion of the carapace and is nearly 



Fig. 3.— Lakva of Trebiu- 



I1.IS, 3.0 M.M. LONG. 



"Bidrag til Kundskab om Snyltekrebsene, 1863, p. 149. 



