84 



duced below the emargiiiatioii to a sharp corner; 5th pair rather large, much 

 more broad than deep, and exhibiting on the middle a very conspicuous trans- 

 versal unilioniforni eminence. Last pair of epimeral plates of metasome not 

 produced at the infero-lateral corners and nearly rectangular. First segment 

 of urosome without any dorsal projection, but slightly impressed at the base. 

 Eyes inconspicuoiis in spirit-specimens. Supeiior antennae, about the length of 

 the 5 anterior segments of mesosome combined; 1st joint of the peduncle elon- 

 gated, more than twice as long as the other 2 combined and of uniform breadth 

 throughout; flagellum of rather coarse structure, about twice the length of 

 the peduncle and composed af aboiit 25 joints, the 1st of whicli is by far the 

 largest; accessory appendage scarcely Vs as long as the flagellum, very narrow, 

 almost setiform, and composed of 6 articulations subequal in size. Inferior an- 

 tennae a little longer than the superior, last joint of the peduncle longer than the 

 preceding one, flagellum more slender than tliat of the superior and composed of 

 about 23 articiilations. Anterior gnathopoda with the propodos about twice as long 

 as the carpiis, oblong oval, palmar edge very oblique and scarcely defined below, 

 dactylus about half the length of the propodos. Posterior gnathopoda with the pro- 

 podos a little broader than the carpus and about lialf its length. Basal joint of the 

 last pair of pereiopoda broadly oval, more than twice as large as that of the ante- 

 penultimate pair. Last pair of uropoda with the inner ramus a little shorter than 

 the outer, terminal joint of the latter rather small. Telson fully twice as long 

 as broad at the base, gradually tajiering, with 2 pairs of dorsal denticles, 

 cleft extending far l:>eyond the middle, very narrow, fissure-like. Colour wliit- 

 ish. Length of the only specimen procured 11 mm. 



BemarJcs. — I have been in some doubt about the sex of the specimen 

 examined and, having not found any distinct incubatory lamellae, have signed 

 it on the plate as a male, thus believing the calceolse of the antennae to be 

 a jieculiar masculine character. The Rev. Mr. Stebbing has, however, on the 

 plate representing his species Tryphosa antennipotens determined the specimen 

 as a female, though it has the antennae provided with calceolse in exactly 

 the same manner as the Norwegian specimen. It would thus appear that in 

 this genus, as is the case with Ichnopus, both sexes are provided with those 

 peculiar appendages. From the Challenger species the present form is easily 

 recognized, not only b}' the peculiar wmboniform eminence of the 5tli pair of 

 coxal plates, but also by the absolute want of an}^ dorsal projection of the 1st 

 segment of the urosome. 



Occurrence. — The above described specimen was collected many years 

 ago at Hvitingso, west coast of Norway, from a depth of about 150 fathoms. 



Distribution. — Skagerak (Gunliilds Expedition), 1 specimen collected 

 at a dei)th of 400 to 420 fathoms. 



