922 MR. F. E. BEDDARD ON ISOPODA COLLECTED [DpC. 1, 



unfortunately only represented by a fragment, dredged near the 

 Antarctic ice-barrier from a depth of 1950 fathoms. 



Tiie head and tlie first four segments of the thorax (all that is 

 left of tlie specimen) are suliequal in lengtii ; each of the four tho- 

 racic segments is furnished with a long slender spine ia the dorsal 

 median line ; the last three segments have in addition a pair of more 

 laterally jdaced spines, whicli are absent from the first segment of 

 the thorax but present upon the head, and situated a little way 

 behind the articulation of the antennae. On the epimera were also 

 two or three long spines. The ventral side of the body is compara- 

 tively smooth ; each of the segments, however, has a minute median 

 spine nothing to compare with those on the dorsal surface, which 

 equal or exceed in length the diameter of the body. 



Station 157, 1950 fathoms. 



ACANTHOCOPE, uov. gen. 



Two individuals, apparently representing as many species of a 

 Munnopsid from the southern hemisphere, I regard as the type of 

 a new genus. 



The characters of the genus may be stated in the following 

 words : — 



General form of the body oval ; no marked difference in breadth 

 between the anterior and posterior regions of the thorax. Anterior 

 segments of the thorax increase progressively in length ; the pos- 

 terior segments of thorax subequal ; epimera of all the thoracic seg- 

 ments from the second onwards enormously elongated into curved 

 siclsle-shaped spines. The abdominal segment is oval, with a long 

 terminal spine nearly twice its own length and two pairs of lateral 

 spines, one more anterior, the second overlying the articulation of 

 the uropoda ; from the inferior surface of the abdominal segment, 

 beneath the articulation of the latter, arises another pair of long 

 spines. Antennae with the two basal joints short, and furnished 

 with one or two long lateral spines. Mandibles divided into several 

 tooth-like processes; molar process stout and powerful, with a blunt 

 edge suitable for crushing ; palp small and three-jointed. First 

 two pairs or first pair only of legs shorter and more slender than the 

 rest, the two or three following pairs subequal and not greatly elon- 

 gated. Posterior thoracic appendages natatory. Uropoda long, 

 styliform, 3- or 5-jointed. 



1. AcANTHOCOPE SPINICAUDA, H. Sp. 



A single male specimen was dredged between Kerguelen and Aus- 

 tralia at a depth of 1 800 fathoms. 



It measures about 7 milliTu. in length, inclusive of the telson 

 spine. 



The general form of the liody is oval ; the first four segments of 

 the thorax are short, gradually increasing in length up to the fourth ; 

 the three posterior segments are together twice as long as the four 

 anterior ; all the thoracic segments, -with the exception of the first, 

 are furnished with long spiniform epimera ; on the first four thoracic 



