175 



FEMALE. The largest specimen is 5-3 mm. long, 5o mm. broad and ab. 39 mm. 

 thick; the specimen represented in fig. 2a, which had laid eleven ovisacs, was 315 mm. long, 

 3-65 mm. broad and 27 mm. tliick; the 3'oung specimen drawn in fig. 2 b, was 1-7 mm. long 

 and broad. The anterior part of the frame of the head (fig. 2 d) rises somewhat above the 

 skin ill front of it; it is tolerably narrow in the middle, broader towards the base of the 

 antenniilae; the foremost lateral angle of the frame is strongly produced and forms a con- 

 sideralde, tolerably broad and not quite short, outstanding, rounded projection, a large part 

 of which, however, is covered by the soft skin. A good deal of the lateral borders and of 

 the short hindmost part of the fi-ame is likewise covered by soft skin similar to that of the 

 surroundings, and on each side, where the lateral and the anterior parts meet, we see, more- 

 over, two good-sized cliitinous parts beneath the skin. On the other hand, the long list which 

 in Ch. mirabile runs outward and backward from the centre of the exterior side of the 

 fi'ame, is altogether wanting. The two pairs of small rings in the skin in fi-ont of the 

 rostrum are advanced to close beliind the anterior part of the frame; the sub-median pair 

 are larger, the more lateral pair much narrower than in the preceding species. The anten- 

 nul* are a little longer than in Cli. mirabile, and have longer seta. The antenn<e are 

 also longer than in the last-mentioned species, distinctly 3-jointed, the basal joint short, the 

 two next joints about sub-equal in length, the terminal seta longer than the tliird joint. 

 Mouth-border fairly broad. Maxillae good-sized, larger than in Ch. mirabile. Maxillipeds 

 rudimentary, yet somewhat larger than in the preceding species and otherwise of the same 

 structiu-e. The liindmost part of the sub-median skeleton consists on each side of a tolerably 

 narrow, posteriorly somewhat expanded list; as in the preceding species a long and robust 

 branch proceeds anteriorly from the exterior side outward just behind the base of the maxilla. 

 In front of the antennula, before and outside the foremost free lateral angle of the frame, 

 and thence more or less backward outside its lateral margins, we see in the adult specimens 

 a number of faii'ly short or short setae (fig. 2d), obliquely outside the lateral angle some 

 very long setae; fig. 2 a, moreover, shows a fairly broad stripe furnished with scattered 

 setae running from each lateral angle somewhat forward and strongly outward along the 

 ventral siuface of the animal towards its anterior outline. Younger specimens (fig. 2 b) not 

 only have setae — some of them very long — on these last-mentioned parts (fig. 2 e), but 

 also a number of similar setae on the sides and on a small part of the ventral smface, as 

 well as a few scattered setae on the back, whereas the greater part of the ventral side is 

 naked. The trunk-legs are very distinct in the smaller specimen represented in fig. 2 b, but 

 in the larger animal (fig. 2 a) I have not been able to find any. The lateral margins of the 

 genital area (fig. 2f) differ somewhat in shape from Ch. mirabile, being geniculate in the 

 centre, so that only their foremost half tm-ns inward. As in the preceding species, the 

 genital area sends forth from its posterior central part two strongly diverging, tolerably 

 short lists, between which, in the half-grown as well as in the adult specimens, we find the 



