REPORT ON THE CTRRIPEDIA. Ill 



This species is represented by half a dozen specimens. Unfortunately they suffered 

 from the alcohol having somewhal evaporated. I believe thai they can be easily 

 distinguished fnmi the other nearly related species, as well by the form of the scutum 

 and tergum as by that of the immovable valves. 



In the scutum I did not observe a brace of a first articular ridge. Thecurve described 

 by the third articular ridge is not, by far, so strongly marked as in Verruca gibbosa. 

 Hence the part enclosed between this ridge and the tergal margin is relatively small. 

 The apex is pointed and slightly beaked. 



The tergum has the apex very blunt ; that part of the occludent margin which runs 

 from the apex to the scutal margin is relatively loug, and runs nearly parallel to the 

 basal margin. This causes the whole valve to have an almost regular rhomboidal shape. 



The carina is rather small ; its apex as a rule projects freely. Its lateral margin runs 

 almost parallel to the same margin of the rostrum, and so the shell acquires a quadrangu- 

 lar shape. 



The rostrum is comparatively large, slightly convex, with the basal and upper margins 

 parallel to each other. The two valves articulate together by means of two teeth and 

 two excavations, present as well at the rostral margin of the carina as at the carina] 

 maro;in of the rostrum. 



The immovable tergum is much larger than the immovable senium. Both valves 

 are almost regularly triangular and convex. Both have the apices bluntly pointed. The 

 immovable tergum cousists of a middle portion and two lateral portions which almost 

 resemble alse, the immovable scutum has a middle portion also; this is, however, rela- 

 tively broader ; the lateral portions form a series of rays, which are very narrow. 



This species lives attached to black coloured horny hollow tubes, which, perhaps. 

 were once inhabited by Annelid worms. The basal edges of the immovable valves are 

 slightly rectangularly inflected, so as to form a ledge round the base. This ledge in the 

 middle of each valve is rather more strongly developed than at both extremities. 

 Hence the margin round the base appears slightly undulating. As this species was repre- 

 sented by numerous specimens, I was enabled to compare also the structure of the animal 

 with that of Verruca e/iltlinsn. Though in general a great conformity was observed, there 

 can be no doubt, I believe, that the two species are really different. The following dif- 

 ferences can be pointed out as of greater importance. 



Mouth. — The labrum has the teeth more numerous and also a little more distinct ; the 

 palpi are slenderer; the hairs on the palpi are not only present at the extremity and on 

 the outer margin, but also on the surface. The mandibles (PI. XI. fig. 10) have three 

 teeth, the third in the outer margin is furnished with notches, and hence looks serrated. 

 The teeth on the inferior angle are not so regular as in Verruca <jih!><>s<i .• they are fewer 

 in number and they present much more strongly marked differences as to their size. The 

 maxilla^ (PL XL fig. 11) have the notch not so wide as in Verruca gibbosa ; the spines 



