4S4 TACI'; SKOC.SHKItC 



circle. Tlio anterior injirjjin ttK) is evenly and boldly roiiiuU'd. Seen from li r 1 o w ((i;^. 2) 

 the shell is narrow and oviform, with its greatest bn>adtli just heliind the middle; the posterior 

 end is somewhat more broadly roiuuleii than the anterior end; the side contours are evenly 

 curved. Seen from inside: Medial bristles: On the rostrum there are rather few or 

 a moderate number of bristles, of which those that are situated nearest to tiie anterior margin 

 of the shell show signs of being arranged in a sparse row ruiiiiint; somewhat within and alxait 

 parallel to the anterior margin of the shell; the rest are scattered. Most of these bristles are of 

 moderate length, a number, especially amongst those situated farthest in, are more or less short. 

 In the incisur there are simihirly rather few or a moderate number of moderately long bristles, 

 some of which are scattered on the anterior wall of the incisur, and some arranged in a close, 

 distinct row running somewhat within and ahdut parallel to the ventral margin of the rostrum. 

 On the part just behind the incisur there are rather few or a moderate numl)er of scattered 

 bristles, of which those situated farthest in are more or less short, the others moderately 

 long. Along the ventral margin of the shell to the spine-bearing list there is a single sparse 

 row of rather short bristles. Almost parallel to and half way between the posterior 

 margin of the shell and the spine-bearing list a distinct row of moderately long bristles runs; 

 this row, which extends along the whole of the spine-bearing list, is rather close ven- 

 trally, but becomes more and more sparse dorsally, and the bristles become shorter at 

 the same time (fig. 3). The spine-bearing list has 29 — 37 hyaline spines varying somewhat 

 in size. There are usually no bristles between the ventrally situated of these spines; there is 

 usually one short bristle between each of the others, but sometimes there is no bristle even 

 between these latter spines. There are no broad pores at all between the list and the 

 posterior margin of the shell. 



First antenna (fig. 4): — This has seven joints, but the third and fourth joints 

 are rather slightly separated from each other, especially on the lateral side of the limb. These two 

 joints together form a joint considerably shorter than it is high and somewhat shorter than the 

 total length of the fifth and sixth joints. The distal boundary of the fourth joint is rather decid- 

 edly concave. The anterior bristle of the second joint is somewhat longer than the anterior side of 

 this joint. The third joint has six anterior bristles, of which nos. 5 and 6 are situated at the 

 side of each other. Of these bristles nos. 1, 2 and 4 are armed ventrally with long, stiff secondary 

 bristles; bristles nos. 3 and 6 also have long secondary bristles, but these are considerably fewer 

 and perhaps somewhat shorter and weaker than those on the three former bristles; bristle no. 5 

 has short hairs. The longer of the two postero-distal bristles on the fourth joint was somewhat 

 shorter on the type specimen than on the Naples specimen and about as long as the total length of 

 the fifth to the sixtb joints. The stem of the sensorial bristle of the fifth joint is about as long 

 as the total length of the third to the fifth joints; it has six sensorial filaments. The end joint 

 has six bristles; the d-bristle is represented only by a verruciform process. The a-claw, which 

 is very weakly pectinated dorsally, is somewhat longer than the total length of the anterior sides 

 of the two next to the distal joints. The f-bristle has four sensorial filaments; the c- and 

 g-bristles have five distal filaments. Pilosity: The first joint ^has short hairs, though only 

 sparsely, dorsally, especially on the outside, and ventrally, especially on the inside. The second 



