107 



OVISACS. Of medium size (fig. 2 c), only slightly differing in size. 



LAEVA. Only one specimen was found, it was hinged. Its cephalothorax is very 

 broad and thick ; the condition of the contents seems to indicate that the larva was developing 

 into a male (comp. above, p. 60). Except in this clumsiness of shape, it agrees entirely 

 with the larva of S. antillensis (pi. Ill, fig. 2 e). 



HABITAT. The marsupium of Gheirocratus Sundevalli (Eathke) from Denmark; 

 till now found only in four specimens. In one specimen were found: one adult female, two 

 males and six ovisacs; in the second: one adult female and four pupae; in the third: one 

 adult female, one male and ten ovisacs; finally, in the fourth: one adidt female, three males 

 (one of them hinged to the base of the hindmost gill), six ovisacs and one larva hinged on 

 the base of the pemdtimate gill. 



EEMAEKS. The above-described difference in the hair-covering of the adult females 

 appears remarkable to me. The female is larger, the male longer and more slender than in 

 any of the following species. 



2. Sphaeronella Atyli n. sp. 



(PL II, fig. 3 a— 3 b.) 



FEMALE. The largest specimen was -99 mm. in length, a specimen with seven 

 ovisacs only -66 mm. Shape like the preceding species. Two specimens have been dissected, 

 and the skeleton of their heads (fig. 3 a) was found to want all the hair-tufts described 

 in the afore-mentioned species, so as to leave only the tuft of hairs at the base of the 

 maxillulse, which is a distinguishing mark of the group. The trunk naked except a belt 

 behind the head , which is covered with numerous , but exceedingly fine and short hairs. 

 The genital area (fig. 3 b) considerably broader than long, the solid chitine forms a ring, 

 the larger part of which is rather broad, as well as a median list; anterior and posterior 

 margins considerably concave; moderately long distance between the genital apertures; the 

 caudal stylets are situated far from each other and at a long or very long distance from the 

 area; genital area and its surroundings naked, except the usual, narrow arch outside each 

 genital aperture. 



MALE. Length 22 mm. More like the male of S. chinensis (pi. Ill, fig. la) 

 than like that of the preceding species. The body is clumsier than in this species, the 

 median frontal plate is shorter, with converging margins and rounded anterior angles. The 

 trunk-legs more slender than in S. elegantula; the terminal seta on the branch of the 

 anterior legs shorter than the leg, that on the inner branch of the posterior pair slightly 

 longer than the leg. 



OVISACS. Comparatively larger than in the preceding species, differing little from 

 one another in size. 



14* 



