180 



which supported the external ligament ; in the left valve the 

 cardinal tooth is obliquely transverse, and the posterior pit is* 

 broad; there is a short ligamental ridge, as in the right valve. 

 The umbonal rib, which is confluent with the cardinal tooth, is 

 short, and extends vertically across the interior to near the- 

 ventral margin. The anterior adductor impression is almost 

 margined in front of the umbonal rib ; the posterior adductor 

 impression is a little nearer the posterior end than to the- 

 umbo. The pallial line is broken up into large spots, and there- 

 is no sinus (at least none is observable in the two examples, in 

 which the pallial spots are clearly traceable). 



This genus has an external resemblance to Saxicava, whilst 

 its dentition agrees with Panopaea; from both of which it differs 

 by its closed valves and internal septa. The discontinuous 

 pallial line is a character belonging to Saxicava, and to some 

 species of Panopa?a, but in both those genera it is sinuated. 



Capistrocardia fragilis, spec. nov. Plate xix., figs. 14a — 14&. 



Shell small, thin, translucent, transversely elongate-oblong. 

 Umbones depressed, approximate, near to the anterior margin. 

 Anterior margin rounded ; dorsal margin sloping backwards,, 

 forming an obtuse angle with the posterior margin, which is 

 straight or slightly convex outwardly ; ventral margin straight, 

 save for a broadish post-medial inflexion. The umbonal ridge, 

 extending to the post-ventral margin, is moderately raised and 

 roundly angulate. 



The exterior surface of the valves is smooth and concen- 

 trically distantly striate ; a few lamella? appear towards the- 

 margins. 



Dimensions. — Antero-posterior diameter, 11*5 ; umbo-ventral 

 diameter, 5 millimetres. 



Locality. — Gastropod bed of the middle Murravian, near- 

 Morgan. Ten examples (R.T.). 



FAMILY SOLENIDiE. 

 Solen sordidus, spec. nov. Plate xix., fig. 2. 



This species is so very like S. Sloanii, inhabiting the coast of 

 New South Wales, that a detailed description is unnecessary. 

 It differs by its straighter dorsal line and being a little nar- 

 rower ; in S. Sloanii the length is five and a-half times the- 

 width ; in S. sordidus it is six times. The actual dimensions- 

 are — Length, 425 ; breadth, 7 millimetres. 



Locality. — Muddy Creek. 



The species has the dentition of Solen and not of Ensis. 



