224 l.'ECOKDS OF THE AUSTRALIAN MUSEUM. 



The figure of L. tmirrayl indicates radial ribs divergent along 

 the median line, a featui-e not mentioned in the description. 

 Partly in reliance on this, and partly prejudiced against the 

 Australian habitat by the European species reputed to have oc- 

 curred with it, Limea accUnis was distinguished as new. Having 

 now recognised several of the "Challenger" 164 B niollusca and 

 confirmed their Australian habitat, we would withdraw L. 

 ardinis as a piobable synonym of L. inutTnyl, and follow the 

 description of the latter wJierc it conflicts witli the illustration. 



Ll.MOPSIS EKECTUS, Sp. nov. 



(Plate xxxviii., figs. 14 and 1-^). 



Shell small, solid, nearl}' equilateral, less oblique than usual, 

 comparatively higli and short. Colour wlut_>. Sculpture : about 

 twenty concentric reverse-imbricating folds, the inner weaker and 

 more wide spaced, crossed by faint radiating riblets. Hmall pits 

 and interlocking tubercles are set round the inner bevelled margin 

 but ascend only half way from the ventral edge. The teeth are 

 disposed in two series, parted by a blank space, anteriorly about 

 seven, nearly perpendicular, posteriorly about six, passing from 

 oblique to horizontal. Area extremely deep, with a narrow 

 median chondrophore. Height 4 nun. ; length 3-7 mm. 



The unusual depth of the area, and diverse inclination of the 

 anterior and posterior teeth, difi'erentiate this from other Aus- 

 tralian species. 



Two separate and worn valves from two hundred and fifty 

 fathoms. 



POROMYA UNDOSA, S}). noV. 



(Plate xxxviii., figs. 16 and 17). 



81iell small, oblong, moderately inflated, anterior end rounded 

 ventral margin produced, posterior end rather square, dorsal 

 margin rather straight. A low oblique wave ridge, preceded by 

 a shallow hollow, runs from the umbo to the posterior \entral 

 angle, where it projects. Umbo prominent, inflated, the space in 

 front of it deeply excavate. Abrasions exhibit a smooth nacreous 

 white shell beneath the tliin pale yellow epidermis. The latter 

 carries dense minute warts, increasing in size towards the margin. 



