The Cumacea of the Puritan Expedition. 425 



Camiìylaspis vitrea n. sp. (pi. 28 figs. 28 — 34), 



Descri])tiou of sub-adult Female (figs. 28 and 29Ì. Total 

 length 4.7 mm. 



The carapace considerably exceeds half the total length aud 

 is mudi elevated posteriovly. As in C. macrophthalma Sars the 

 side of the carapace bears two oblique keels, which, however, are 

 bere elevated into laminar crests. At about Y4 the length of the 

 carapace from ito hinder raargin the upper lateral keels are con- 

 nected with each other aerosa the dorsal snrface by a straight 

 transverse keel and from the junction on each side a short keel 

 ranning downwards and backwards joins the lo wer lateral keel. 

 The transverse keel and the two short conneeting keels form three 

 sides of a roughly quadrangular area sloping downwards aud back- 

 wards, the posterior side of which is formed by a ridge running 

 just above the hinder margin of the carapace and forming, when 

 viewed from above, two broadly rounded lobes divided by a median 

 uotch. x\nteriorly the upper lateral keels curve inwards towards 

 the pseudorostrum without forming any distinct angle as they do in 

 C. macrophthalma. The short vertical ridge which in the species 

 named connects the two lateral ridges anteriorly is present, though 

 less prominent than the others. The posterior (luadrangular area 

 mentioned above and the areas between the lateral keels on each 

 side are distinctly concave. The portion of the dorsal surface in 

 front of the transverse keel is nearly fiat and does not rise above 

 the upper lateral keel as seen from the side. There is no eye and 

 the ocular lobe is represented by a short and narrow process in 

 front of which the pseudorostral plates meet for about Ve of the 

 length of the carapace. The pseudorostrum is long, rather 

 acutely pointed as seen from the side, with the dorsal outline 

 slightly convex. The antennal notch is obsolete and the antero- 

 lateral angle obtuse. Ali the keels of the carapace are finely 

 serrated. 



The first three leg-bearing so mit es bave trans verse crests 

 dorsally; the last two bave each a pair of cristiform teeth on the 

 dorsal surface. 



The abdominal somites (fig. 30) are ornamented with thin 

 longitudinal ridges or crests which are tinely and somewhat irre- 

 gularly serrate. The first four somites bave paired dorsal, lateral 

 and ventro-lateral ridges. On the tifth somite the arrangement of 



