158 



much like those of the preceding species, only the penultimate joint and the long terminal 

 seta are comparatively a little shorter. Maxillulae as in the preceding species. Basal joint 

 of the maxillae as in S. clecorata, second joint distally provided with a number of tolerably 

 long, stiff setae, third joint has at its inner margin four processes, the outermost of which 

 is much longer than the others and conspicuously longer than the curved end of the joint. 

 Abdomen as in the two preceding species ; the setae of the caudal stylets somewhat exceeding 

 half the length of the body. 



POST-LABVAL DEVELOPMENT. Unknown. 



BABITAT. The marsupium of EudoreJJa truncatula (Sp. Bate) from Denmark. In 

 a large material I found only four infested specimens; one of them has no special locality, 

 whereas the three others were taken in the Kattegat on the cruises of the »Hauch«, two of 

 them at Stat. 383 (fourteen fathoms), the third at Stat. 387 (seventeen fathoms). In one 

 specimen (from Stat. 387) occurred: only one female and one male; in another (from Stat. 383): 

 one female, two larvae (intruders) and about twenty-four of the host's own eggs; in a third 

 specimen (from Stat. 383) were detected: one female, one male, three mutually adhering ovisacs 

 and one of the host's own eggs. In the fourth specimen were discovered: an oblong lump 

 consisting of about a score of firmly adhering ovisacs, partly covering a female which was 

 lying towards the front, further: a male and a disturbed ovisac, the larvae of which were 

 breaking out. 



30. Sphaeronella insignis n. sp. 



(PI. IX, fig. 4a— 4g; pi. X. fig. la-lh.) 



To begin with, I will observe that I have assigned to this species specimens from 

 two species of the genus DiastyJis, viz. D. Jcevis Norm, and D. cornuta Boeck. However, 

 from each of these species I possess only one female, one male and some fall-grown larva?. 

 To the differences between the two females I can attribute no value, and the differences 

 between the two males from the two species of hosts are not greater than those which I 

 have found in other forms of the family between specimens taken on the same species of 

 hosts ; between the larvae there is no difference. However, in order to present the deviations 

 found, I give three double sets of figures, and point out the differences in the corresponding 

 text; but, in spite of the scantiness of my material, I really do not doubt that it is the 

 same parasite which lives in both species of hosts. 



FEMALE. A specimen (from B. Jcevis) was 116 mm. long, -88 mm. broad (fig. 4a), 

 and somewhat flattened. The head is not defined from the trunk, and it agrees very closely 

 (fig. 4 c) in all details with the preceding species. The antennulae (fig. 4 c from D. Jcevis, 

 fig. 4f from D. cornuta) scarcely offer any characteristic, and the same remark applies to 

 the mouth. The branches of the maxillulae, at least in the specimen from D. Jcevis, is some- 

 what longer than in S. dispar; additional branch wanting. The maxillae a little smaller 



