CRUSTACEA MALACOSTRACA. III. 



179 



which he gave a long diagnosis. But I do not believe that he would have established this family, 

 if he had possessed an extended knowledge of the numerous and partly peculiar genera of the Sphsero- 

 midse, and now, after my paper from 1905, I think it superfluous to discuss the question on the affi- 

 nities of Bathycopca and its place in the system. It can scarcely be questioned that either his family 

 Anciniidse must be cancelled or, what in my opinion would be very unfortunate, the Sphseromidse as 

 limited by me be divided not into two or three but into a good number of families. 



122. Bathycopea typhlops Tattersall. 

 (PI. XIV, figs. 7 a— 7 1 ; PI. XV, figs. 1 a-i e). 



1904. Bathycopca typhlops Tattersall, Rep. Brit. Assoc, (nomen nudum). 

 11905. — — Tattersall, Isopoda, p. 12; PI. Ill, figs. 1 — 13. 



1905. Ancinella profunda H. J. Hansen, Quart. Journ. Micr. Sc. Vol. 49, Pt. I, p. 132. 



Tattersall published a good figure and a very elaborate description of this animal. Some parti- 

 culars may yet be mentioned here. 



Eyes generally wanting, but in a male I found an eye composed of three well developed facets 

 on the right side a little from the antero-lateral margin, but no left eye. — Tattersall described the 

 antennulse, but he did not observe that the flagellum shows sexual difference, and he evidently described 

 those of the female. He said that the peduncle has four and the flagellum seven joints, but this mode 

 of counting is incorrect, as more than three joints cannot be ascribed to the peduncle in any Isopod. 

 Thus we get eight joints in the flagellum, but in the female (fig. 7 b) I found nine, the eighth being 

 very short, seventh and eighth very slender, the ninth extremely thin. In the male (fig. 7 a) the anten- 

 nulse are conspicuously longer than in the female; the flagellum has eleven joints, and the three distal 

 shaped completely as in the female. — The flagellum of the antennae is similar in both sexes; Tatter- 

 sall stated it to be five-jointed, but in ovigerous females and adult males (fig. 7 a) I found nine joints, 

 the three distal very slender and small. 



Tattersall wrote: "Labrum produced somewhat acutely into a process underlying the rostrum". 

 This I cannot understand. Labrum (fig. 7a,/) is transverse, very movable and, as might be expected, 

 without any trace of process. — What Tattersall mentioned as "a spine serrated distally on one edge" 

 on the mandible is in reality the peculiar molar process (fig. 7 d), and it is not articulated to the cor- 

 pus viandibulcE. 



The prehensile hand of first pair of legs (figs. 7 i and 7 k) does not seem to show any constant 

 sexual difference. The hand on second pair (fig. 7 h) in the male is interesting; sixth joint is very 

 oblong and on the lower margin armed with some four processes shaped as thick spines with extremely 

 fine hairs at the end and a conspicuous seta inserted before the end; seventh joint is long, consider- 

 ably curved, of about the same breadth to the rounded end and without claw. 



Last abdominal segment at the base considerably less broad than the broad but very short 

 anterior section of the abdomen; the upper surface of the last segment has a raised semicircular ridge 

 laterally rather remote from, but subparallel with, the lateral margin, and at the median line a little 

 longer from the posterior end than from the anterior margin; parallel with and rather near to the 



23* 



