CRUSTACEA MALACOSTRACA. III. 31 



14. Haploniscus spinifer n. sp. 

 (PL II, figs. 3 a-3 h.) 



Description. This species is so closely allied to //. bicuspis, that it is sufficient to point out 

 the differences. — The antennulse with only 4 joints in the flagellum (fig. 3 a). The antennae have the 

 process on third joint nearer to its base (fig. 3 c) than in H. bicuspis; in both sexes the last joint of 

 the peduncle has an oblong tooth or acute process above at the distal end (figs. 3 a— 3 b), and the 

 flagellum has only n joints. — The median lamella of the male operculum (fig. 3 f ) is only about half 

 as long again as broad at the base, the proximal part of the outer margin somewhat convex without 

 the incision found in H. bicuspis, and the terminal part of the lamella has its lateral margins convex, 

 without any protruding angle. 



Two adult males from the same place (Stat. 22) differ considerably from one another; one is 

 shaped as the male figured of H. bicuspis (fig. 2 a), but its postero-lateral processes are much larger 

 (fig. 3 d), each being half as long again as the posterior margin between them. The other male looks 

 almost like a female, as the lateral margins of the body are more convex, and the animal consequently 

 broader in proportion to length, furthermore the antennulae and antennae are distinctly more slender, 

 and the postero-lateral processes (fig. 3e) much shorter, being even shorter than the margin between them. 



The largest male measures 2-8 mm. from the front margin to the end of the very long postero- 

 lateral processes. No female with marsupium was secured. 



Remarks. The process at the end of the autennal peduncle is the best character between 

 //. spinifer and H. bicuspis, as the latter species has no trace of any process. A second allied species 

 without any process at the end of the antennal peduncle is H. rctrospinis Richardson, of which I have 

 examined co-types from the U. S. Nat. Mus. 



Occurrence. Taken by the "Ingolf at three stations, all in the warm area. 



Davis Strait: Stat. 36: Lat. 6i°5o' N., Long. 56°2i' W., 1435 fath., temp. 1-5°; 4 spec. 



South of Davis Strait: Stat. 22: Lat. 58°io' N., Long. 48°25' W., 1845 fath., temp. 1-4°; 4 spec. 



South-West of Iceland: Stat. 78: Lat. 6o°37' N., Long. 27°52 f W., 799 fath., temp. 4-5°; n spec, 



but most of them very young. 



Haploniscus armadilloides n. sp. 



(PI. II, figs. 4 a— 4 d). 

 Female. Body about two and a half times as long as broad, rather convex, and the major 

 part nearly semi-cylindrical; the general appearance reminding one of a minute Anna dillo. — The sides of 

 the head somewhat expanded outwards and forwards, so that the anterior margin, which has its median 

 part somewhat convex (figs. 4 a — 4 b), is conspicuously concave between the middle and the broadly 

 rounded antero-lateral angles. The frontal plate (fig. 4 b) is a rather broad triangle with the apex 

 acute and each lateral margin sinuate. — Antennulfe about as long as the head; flagellum shorter than 

 the peduncle, 3-jointed (fig. 4 b). — Antennae short, reaching about the posterior angle of first thoracic 

 segment; the first joint could not be made out; the process on third joint is extremely long, slender, 

 acute, projecting outwards and a little forwards from the anterior side of the joint, and reaching to 

 near the end of fifth joint; flagellum a little shorter than the peduncle, 7-jointed. 



