102 MR. F. E. BEDDARD ON ISOPODA COLLECTED [Feb. 2, 



seventh thoracic segment and the abdominal shield is a narrow 

 free abdominal segment, which is ridged like the posterior segments 

 of the thorax. The abdominal shield is almost circular in its 

 outline anteriorly ; posteriorly it terminates in a triangular-pointed 

 extremity ; the posterior region is slightly serrated. 

 Kerguelen, 120 fathoms. 



2. Pleurogonium serratum, n. sp. 



This species, like the last, is represented by a single female example 

 measuring 3 millim. in length. 



The head is small and almost enclosed by the following segment 

 of the thorax ; the frontal margin is straighter than in the last 

 species, and the articulation of the antennae is not so near to the 

 posterior boundary of the head ; the hinder margin of the semi- 

 circular notch which lodges the antennae is prolonged outwards into 

 a longish pointed process, which extends laterally nearly as far as 

 the epimeron of the first thoracic segment. The thoracic segments 

 are so like the last species that no special description is needed. The 

 most characteristic and obvious difference between the two species is in 

 the abdominal shield, which has, however, the same general shape in 

 P. serratum as in P. albidum ; in the former species the lateral 

 margin as far back as the articulation of the uropoda is strongly 

 serrated ; there is no trace of any such serrations in P. albidum 

 except along the posterior extremity of the caudal shield behind the 

 uropoda, in which situation they are absent in P. serratum. 



Kerguelen, 120 fathoms. 



3- Pleurogonium minutum, n. sp. 



The third new species of this genus is represented by a single 

 female example, dredged oflF Tristan da Cunha. It measures about 

 1 millim. in length. 



The general shape of the body is like that of the other species. 

 The epimera of the thoracic segments are not prolonged into spines 

 as in the last two species, but are rounded in the four most anterior 

 segments and truncated in the posterior thoracic segments. The 

 abdominal shield is oval, tapering posteriorly ; anteriorly the margins 

 of the abdominal shield are serrated, but the serrations are not nearly 

 BO marked, nor do they extend over so great an area as in P. serratum. 

 In the two last species the antennae are twice the length of the 

 antennules ; in the present species they are longer, but only half 

 as long again : in this respect therefore Pleurogonium mmutum is 

 more typical, that is to say it agrees more closely with the northern 

 forms described by Sars. 



Off Tristan da Cunha, 100-150 fathoms. 



ACANTHOMUNNA, UOV, gCH. 



Thie genus is like Munna in outward form, and is furnished with 

 a pair of eyes elevated on stalks as in that genus ; the thoracic limbs 

 are entirely like those of Munna except that they terminate in a 



