240 "TERRA NOVA" EXPEDITION. 



eight small spines on the first margin and the inner hinder distal corner produced into 

 a strong spine. The sixth joint has a single row of eight spines on the front margin, 

 and two prominent spines on the outer hinder margin. On the seventh joint there is a 

 small secondary spine near the tip of the dactylus. 



. There are four pairs of incubatory lamellae in the female, and the exopod of the 

 first pleopod of the male is modified as I have described it under the genus Antarcturus 

 (pi. VIII, figs. 1, 2). 



This species comes very near to A. glacialis, Bedd., but the latter has no pre-ocular 

 sjDines on the antero-lateral corner of the head, and the spines arming the body are 

 smaller, finer and much more numerous. 



I have compared my specimens with those identified as A. furcatus by Beddard 

 from the "Challenger" collections, and find the following differences. In the 

 " Challenger" specimens the spines of the body are more erect, especially the two promi- 

 nent ones on the cephalon, and on the abdomen there is a specially prominent spine 

 about half-way down on each side which is conspicuously larger than the rest. In my 

 specimens there is no outstanding spine of this kind on the abdomen, and Studer shows 

 none in his figure. Moreover, both Studer's figure and the present specimens agree in 

 the flattened outwardly spreading form of the cephalic horns. On the other hand, 

 the " Challenger " specimens agree with mine and with Studer's figures in the general 

 details of the armature of the body, the position of the spines and their general arrange- 

 ment. The present specimens are in closer agreement with Studer's figures than the 

 " Challenger " specimens, and the only really vital difference is in the length of the 

 terminal spines of the metasome, which are longer than Studer shows and more nearly 

 resemble those figured by Beddard in A. glacialis. 



A. furcatus is nearly as common in this collection as A. j^olaris, but in Antarctic 

 waters at any rate appears to be a deeper water form with the maximum of distribution 

 at about 200 fathoms. Studer's specimens were from Kerguelen, and the " Challenger " 

 records it from two or three localities near there, and from one place in the Southern 

 Ocean at a depth of 1,675 fathoms. 



44. Antarcturus franhlini, Hodgson. 



Arctiirus franMini, Hodgson, 1902, p. 250. 



Antarcturus franhlini, Hodgson, 1910, p. 38, pi. V, figs. 2, 3 ; Richardson, 1913, p. 10. 



Occurrence. — Station 314, 5 miles N. of Inaccessible Island, McMurdo Sound, 

 222-241 fathoms, bottom fauna, three males and three females, 18-25 mm. 



Station 318, hole in the ice between Cape Evans and Inaccessible Island, 

 95 fathoms, bottom fauna, one male, 16 mm. 



Station 355, 11° 46' S., 166° 8' E., 300 fathoms, bottom fauna, two females, 20 mm. 



Bemarks. — A smaller species than the last, and having the centre of its distribution 

 in deeper water. Unlike A. polaris, the two sexes are quite different in external aspect, 

 so much so that Hodgson at first described each sex as a separate species. 



