236 



Mouth-parts: Labrum concave, without teeth in the dissected specimen. Palpus 

 conical, rather blunt, with long bristles at the point and on one margin. Mandible 

 with three teeth and an inner angle divided into two somewhat pectinated points. 

 Maxilla I has the lower corner of the front edge blunt. A little notch is situated in 

 the upper half of the front edge. The first spine is strongest, and smaller ones are 

 situated at the lower corner. Maxilla II with the front edge without a notch, and with 

 a continuous row of bristles. A posterior lobe with bristles is differentiated. Behind 

 this lobe is a small maxillary lobe (not indicated in the figure). 



Number of segments of the cirri of the Holotype 

 Cirrus I II III IV V VI 



Caudal 

 appendage 



Segments 6 8 11 12 12 12 12 12 12 13 13 14 i 



Cirrus I much shorter than the other cirri, with rami of unequal length. The shorter 

 ramus is about one-third of the longer. 



Cirri II-VI have rami of equal length. Cirrus II is somewhat shorter than the 

 following. Cirrus VI with three pairs of spines on the front edge of the segments. 



The caudal appendage is single-jointed, without any traces of bristles. It is of the 

 same length as the proximal segment of the protopodite. 



Compleynental male. On the inside of both scuta a complemental male was found. 

 One of these is figured (Fig. 4,/). It is difficult to make out the finer details as the 

 male is enclosed in a part of the mantle. The male is of the sack-like type without 

 any traces of valves. Near the one pole the two prehensile antennae are situated. 

 At the opposite pole a small lobe is difi^erentiated. From this part a long projection 

 is formed, on the top and sides of which are some bristles. This is of interest as the same 

 is found in S. gibberum (Nilsson-Cantell, 1921, p. 184, text-fig. 25,/). The contours 

 of the testis can be traced. The sack is provided with muscular bands as in other 

 males, but these are only indicated in this figure. The surface is covered with very 

 small spines. 



Scalpellum magnae-carinae, n.sp. 



St. 187. 18.iii.27. Neumayer Channel, Palmer Archipelago. 64° 48' 30" S, 63° 31' 30" W. 

 259 m., m. Gear DLH. One specimen, destroyed. 



St. 190. 24. iii. 27. Bismarck Strait, Palmer Archipelago. 64° 56' 00" S, 65° 35' 00" W. 315 m., 

 m. r. Gear DLH. Two specimens, one selected as holotype. 



Holotype. Zoological Department of the British Museum. 



