io6 DISCOVERY REPORTS 



Remarks. The adult male is not in a sufficiently good condition to give accurate 

 measurements. It agrees with the immature specimen in most respects. The transverse 

 body ridges on the second and third segments are more massive and are higher than the 

 ocular tubercle. The chela is greatly reduced so that the chelophore is shorter than the 

 proboscis. A fourth spine is present on the propodus of each walking leg (Fig. 55 c) 

 and the setules are arranged in distinct longitudinal bands on the three long segments. 

 Segments 2-6 of the oviger measure 4-4, 3-6, 4-0, 4-4 and 2-5 mm. respectively; the 

 terminal segments are represented in Fig. 55 Z). The right palp is sUghtly abnormal near 

 the tip ; segments 7 and 8 seem to be fused together. 



This species appears to be related to A. stylirostris, from which it can easily be 

 distinguished by (i) the shape of the proboscis, (2) the longer claw and much larger 

 spines on the propodus, (3) the larger chelophore, and (4) the much shorter fourth palpal 

 segment. 



Distribution. Palmer Archipelago and off Oates Land. 



Ammothea stylirostris, n.sp. (Figs. 56 and 57). 



St. 39. 25. iii. 26. East Cumberland Bay, South Georgia, from 8 cables S 81° W of Merton Rock 

 to 1-3 miles N 7° E of Macmahon Rock, 179-235 m.; gy. M. Large otter trawl: i ? (holotype) and 

 I immature specimen with well-developed chelae. 



Description of holotype. Trunk of rather compact build ; intervals between lateral 

 processes increasing posteriorly. Transverse body ridges rather prominent, each rising 



Fig. 56. Ammothea stylirostris, n.sp. Holotype. Lateral view of body 

 with chelophore and palp: x 5. 



in the centre to a low, rounded point. Cephalic segment nearly as long as the sum of 

 the three posterior segments, considerably expanded on a level with the ocular tubercle ; 

 a low rounded lobe projecting over the base of each scape. Ocular tubercle almost half 

 as high again as wide, tapering abruptly to a point distally. Anterior twice as large as 

 the posterior pair of eyes (Fig. 56). 



Proboscis approximately two-thirds as long as trunk, straight, widest at base, which 

 is surrounded by a prominent collar, and gradually narrowing distally; presumably 

 adapted for probing. 



