96 DISCOVERY REPORTS 



ii. Proboscis styliform ; chelophore not exceeding one-third of proboscis 

 [fourth palpal segment the longest]. 



a. Palp longer than proboscis and segment 4 almost twice as long as 2 ; 

 two small proximal and one median spine on ventral margin of 

 propodus; claw less than half of propodus; cephalic segment 

 almost equal to the sum of the three succeeding segments 



A. stylirostris , n.sp. 



)3. Palp slightly shorter^ than proboscis and segment 4 almost half 



as long again as 2; two proximal spines on ventral margin of 



propodus, the longer at least half of main claw which again exceeds 



half of the propodus ; cephalic segment equal to the sum of the two 



succeeding segments A. sp.? St. WS 216 



h. Proboscis equal to or longer than trunk [straight, pyriform or sub- 

 cylindrical]. 



i. Palpal segment 2 almost half as long again as 4; numerous long, fine 

 hairs on walking legs; chelophore at least half as long as proboscis 



with long slender scape A. meridionalis, Hodgson 



ii. Palpal segment 4 equal to or longer than 2 ; setules but no hairs on 

 walking legs; chelophore not exceeding one-fourth of proboscis in 

 adults, scape short and stout [2-4 spines on proximal ventral margin 

 of propodus, the longest not quite half of main claw]. 

 a. Palpal segment 4 equal to, or rather longer than, 2 (1-1-45 • i) 



A. glacialis (Hodgson) 



j3. Palpal segment 4 almost twice as long as 2 A. caroli?iensis, Leach^ 



{A. graiidis, Pfeffer) 

 and A. gibbosa, Mobius 

 H. Transverse body ridges low, without median processes [proboscis longer than 

 trunk, pyriform ; chelophore not exceeding one-third of, palp longer than, proboscis ; 

 second tibia the longest segment ; auxiliaries two-thirds of main claw, which is half 

 of proboscis; species of small size]. 



A. Abdomen sub-vertical, in contact with posterior border of third segment; 

 3-4 small spines on proximal ventral margin of propodus, the longest rather 

 more than one-third of main claw A. claiisi, Pfeffer 



B. Abdomen oblique, separated by a short distance from posterior border of third 

 segment ; 5 small spines on proximal ventral margin of propodus, subequal and 

 about one-fourth of main claw A. australis, Hodgson 



Ammothea striata (Mobius) (Fig. 47 b). 



Leionymphon striatum, Mobius, 1902, p. 183, pi. xxvi, figs. 7-12. 



Ammothea striata, Bouvier, 1913, p. 124, figs. 75-77 (nee A. striata'^. Caiman, 1915, p. 55). 



St. 167. 20. ii. 27. Off Signy Island, South Orkneys, 60° 50' 30" S, 46° 15' W, 244-344 '^■'■> 

 gn. M. Large otter trawl: i S, largely overgrown with Polyzoa and Alcyonidium. 



Remarks. This species retains the chelate chelophore in the adult, as figured by 

 Bouvier (1913, p. 125, fig. 75).^ The scape is not quite half the length of the proboscis 



^ Palp not quite normal — may be longer or at least equal to proboscis in A. sp.? St. WS 216. 



" There is very little difference between A. carolinensis and A. gibbosa (see Bouvier, 1913, pp. 123, 129 

 and Caiman, 1915, p. 52). A. clausi and A. australis also are very similar; future investigations may result 

 in uniting the two forms in either or both of these cases. 



^ See Caiman, 1915, p. 56, on this point; the specimen is mature. 



