108 



LARVA and POST-LARVAL DEVELOPMENT. Unkno\vn. 



HABITAT. The marsupium of Paratylus Swammerdamii (M.Edw.) from Denmark. 

 Found only in five specimens. Two of these contained only one adult female each, the third 

 had an adult female and a male, the fourth one male and seven ovisacs. The fifth spe- 

 cimen contained no female, but thirteen ovisacs, but whether all these belong to one single female 

 which has fallen out, cannot be decided ; some of the sacs contain almost fully developed larvae. 



3. Sphseronella danica n. sp. 



(PI. II, fig. 4 a— 4 e; pi. XIU, fig. 2 a.) 



FEMALE. The largest specimen was -88 mm. in length, -76 mm. in breadth. 

 Shape of the body much the same as in S. chinensis. It will be to the purpose to begin 

 with a description of this specimen. The most proximal part of the basal joint of the maxillae 

 is hairy on its inner side; there is moreover an area densely covered with hairs in front of, 

 and a similar one behind the base of the maxillipeds. A part of the trunk behind the head 

 is furnished with a number of fine, simple hairs, the remainder of it is naked. The genital 

 area (fig. 4 a) is somewhat broader than long, the greater part rather solidly cliitinised; the 

 genital apertures at moderately long distance from each other; the caudal stylets far fi'om 

 each other, but not very far from the posterior margin of the area; between and behind the 

 genital apertures the area is furnished with normal, fine hairs, and so is the skin extending 

 from the area to somewhat behind the caudal stylets. — A much smaller specimen, only 

 "45 mm. long, has a comparatively large head, and its trunk is a little longer than broad. 

 Distribution of hairs on the head as in the large specimen; the trunk seems to be quite 

 naked, and the genital area, which was not cut off, is well developed and — as far as can 

 be judged — seems to agree with that of the large specimen (a spermatophore was also 

 attached to it). — In a somewhat smaller specimen, -41 mm. long, which was dissected, 

 the hairs behind the base of the maxiUipeds were wanting, the trunk was hairy anteriorly 

 as in the largest specimen , but the genital area was not developed (pi. XIII, fig. 2 a) , the 

 more solidly chitiuised part being represented only by a rather small area surrounding the 

 entrances to the receptacula seminis (one of these is indicated by a dotted line). The genital 

 apertures themselves are as in the adult animal, but the caudal stylets are situated close 

 behind them, and the surface between and behind these apertures extending beyond the stylets, 

 is furnished with normal hairs. — Another specimen wliich is even a little smaller, measuring 

 ■407 mm. in length, deviates in many respects from the preceding animals. The body is a 

 nearly elongate oval; the head wliich takes up a good deal more than one third of the 

 whole length, and which is very large, has, in addition to the hairs found in the large 

 specimen in front of and behind the base of the maxillipeds, conspicuous tufts or stripes of 

 hairs on the inner side of the base of the maxillae and on the skeleton in front of and 



