205 



binecl, inferior edge straight and horizontal, posterior expansion broadly 

 rounded at the tip. Last segment of metasome produced at the end dorsally 

 to a gibbous projection, pointed at the tip; epimeral plates of same segment 

 nearly transversely truncated at the lateral corners, superior angle acutely 

 produced, inferior nearly right. Superior antennae with the 1st joint of 

 the peduncle scarcely longer than the other 2 combined, flagellum half as 

 long again as the peduncle and composed of G articulations, the 1st of which 

 is the largest, though scarcely as long as the 2 succeding ones combined ; 

 accessory appendage very small. Inferior antennae about the length of the 

 superior, last joint of the peduncle somewhat larger than the penultimate one. 

 G-nathopoda with the propodos rather narrow, tapering distally, and scarcely 

 longer than the carpus. Last pair of pereiopoda considerably shorter than 

 the preceding pair, basal joint not attaining the length of the remaining part 

 of the leg, oblong in form, slightly expanding distally, infero-posterior corner 

 evenly rounded off. Last pair of uropoda with the rami lanceolate and 

 unarmed. Telson oval in form, but little longer than it is broad at the 

 base, cleft somewhat open and not extending to the middle. Colour 

 uniformly milk-white, without any pigmentary markings. Length of adult 

 female 8 mm. 



Eemarh'x. In its general habitus, the present species shows an 

 unmistakable resemblance to the arctic form figured by Dr. Stuxberg as 

 Steyoceplialus Kessleri, and I am therefore disposed to regard both as con- 

 generic. The Norwegian species is however easily distinguishable from that 

 form, not to speak of its far inferior size, by the want of any distinct 

 rostral projection, by the peculiar gibbous prominence of the last segment 

 of metasome and the apparently different form of the epimeral plates of 

 same segment; finally, by a somewhat deviating shape of the 4th pair of 

 coxal plates and of the last pair of pereiopoda. From the other Norwegian 

 Stegocephalidae it is moreover readily recognized, when alive, by the uni- 

 formly milk-white body. 



Occurrence. I first detected this pretty form at Folgero, west coast 

 of Norway, where a few specimens were taken from a depth of 120 fathoms, 

 among living Loplielia prolifera. Quite recently I have met with the same 

 form in the Trondhjemsfjorcl, at Redbjerget, under quite similar circumstances. 

 Out of Norway it has not yet been recorded. 



