230 



Chione (Timoclea) hormophoba. 



Shell solid, ovate-oblong, inflated; truncately rounded in 

 front, truncated behind, Yentral margin arched, post-dorsal 

 margin strongly arched, antero-dorsal margin straight, surface 

 ornamented with numerous concentric lamellae thickened and 

 recurved, becoming erect and thin towards the posterior and 

 anterior margins ; the interstitial spaces with numerous 

 flattish radial ridges, about equal in breadth to the intervening 

 sulci, which are continued on to the bases of the concentric 

 folds and to the free margin of the frills on their undersides. 

 Lunule cordate, not much impressed under the umbo and 

 indistinctly margined. Umbo is in the anterior fifth, large 

 incurved and directed forwards. Inner margin of valves, 

 excepting that of the post-dorsal region, is minutely crenu- 

 lated. Posterior cardinal tooth in left valve is quadrate and 

 bituberculated on the crown. 



Greatest length, 65 ; greatest hreadth at about 15 mm. 

 behind the umbo, 57 ; thickness, 48 millimetres. 



Locality. — Table Cape. E. M. Johnston (a left valve). 



C. hormophora has a closely allied species in a common fossil 

 at Muddy Creek, and near Morgan, which I name. 



Chione (Timoclea) dimorphophtlla, 

 Which differs in its more regularly rounded front-margin, 

 in the less inflated and more posteriorly placed umbo ; in the 

 more impressed and concave lunule, and in the relatively 

 different dimensions. 



Length, 58 ; hreadth, 45 ; thickness, 32 millimetres. 



Lima Jeffreysiana. 



Syn. — Lima subauriculata, Tenison- Woods (iion Mont.). 

 Species dedicated to Mr. Gwyn Jeffreys, F.E.S., the eminent 

 conchologist, in acknowledgment of his assistance in its elabo- 

 ration. 



Shell thin, elongate-ovate with nearly straight sides, sub- 

 equilateral by the slight obliquity of the hinge line, ventricose. 

 Surface ornamented with distant, acute, longitudinal ribs and 

 close-set, undulate, concentric stride; the rays are very con- 

 spicuous on the middle and anterior parts, but become indis- 

 tinct towards the posterior border; the intercrossing of the 

 medial ribs and the concentric striae form blunt imbricating 

 serratures ; the concentric striae merge into strong folds 

 towards the anterior border. Auricles of moderate size, 

 equal, sharply angular. Umbos elevately and acutely produced. 



Length, 23 ; hreadth, 15 ; thickness, 16 millimetres. 



Localities. — Table Cape. E. M. Johnston. Yorke Penin- 

 sula, Aldinga, Eiver Murray Cliffs, Muddy Creek and Schnapper 

 Point, Hob son's Bay. E. Tate. 



