109 



outside the articulation of these appendages. The trunk is closely covered all over with 

 the peculiar membranous hairs which are mentioned above as having been found on the anterior 

 part of the trunk and on the genital area of the one specimen of S. elegantula. — Two still 

 smaller specimens — the smaller one only - 34 mm. long and '19 mm. broad, — are very like the 

 last-mentioned specimen, which shows that these three very young animals differ very much 

 from the older ones in the hair-covering of the head and — particularly — in that of the 

 trunk. As a matter of course, the genital area is not developed in these small specimens, 

 but the animal mentioned as measuring - 41 mm. shows that, at least sometimes, this area 

 does not develop its final shape till some time after the animal has lost the hair-covering 

 that was characteristic of it when young. For want of ampler material I cannot decide 

 whether this course of development is the rule in this species. 



MALE. A large specimen is 24 mm. in length. It is somewhat more clumsy than 

 the male of S. elegantula, but on the whole closely resembles this species, as e. g. in the 

 shape of the median frontal plate, which, however, is a little shorter, and in the legs, the 

 long terminal setae of which are longer than each leg; but the anterior pair of trunk-legs 

 seem to be smaller, compared with the basal joint of the maxillipeds, than in the afore- 

 mentioned species; the caudal stylets are hardly so long. — The smallest male found is 

 only 45 mm. long, but it seems to be just hatched, for the frontal plate is bent downward, 

 the rostrum backward and the antennulse turn backward (comp. p. 60). 



OVISACS. Are pretty large, but occasionally show great difference of size, being 

 shortly oval or sub-globular. 



LARVA. A single hinged specimen was found, but is lost. 



POST-LARVAL DEVELOPMENT. Nine pupae have been found, all closely 

 covered with hairs (fig. 4 c — 4e); the smallest 115 mm., the largest -25 mm. in length. As 

 for more particulars, I refer to the detailed account on p. 59 — 60. 



HABITAT. The marsupium of CoropMum crassicorne Bruz. from Denmark. In 

 one specimen were found one pupa and the smallest above-mentioned female; in another the 

 smallest female but one and one male; in a third specimen a young female and a hinged 

 larva; in a fourth the largest female but one, one male and four ovisacs of very different 

 size; in a fifth specimen a small female; in a sixth animal the largest female, one pupa and 

 two males, both fixed by a frontal thread, one of them being an adult, while the other was 

 the above-mentioned, recently hatched individual. In a seventh specimen four ovisacs were 

 found, no female, but the anterior halves of two males, which had evidently been destroyed 

 before the host was caught. Finally, in an eighth specimen, two ovisacs and seven pupae, 

 two of which were situated each on one side of the marsupial plate of the sixth (right) leg, 

 one on the gill of the penultimate (left) leg, one on the inner side of the basal joint of the 

 posterior left leg. 



