BIVALVIA. 149 



12. Cardita oblonga, J. Soioerhy. Tab. XXII, fig. 14, a, b. 



Venericardia oblonga, J. Sow. Mill. Conch., t. 289, fig. 2, 1821. 



Spec. Char. C. Testa transversa, oblonga, crassimcidd, subquadrangulari, valde inaqui- 

 laterali ; radiatim costatd, costislS — lb, elevatis, tuberculosis ; umbonibus depressis ; lunula 

 parvd, cordiformi; car dine crassiusculo. 



Shell transverse, oblong, subquadrangular, thick, strong, very inequilateral ; costated 

 with 13 — 15 tuberculated ribs; beaks depressed; kumle small, heart-shaped, depressed; 

 hinge moderate. 



Length, x^ths of an inch ; height, \ an inch. 



Localities. Barton, Hordle, Highcliff, Bracklesham {Edwards). 



This is a pretty species, and abundant at Barton. The umbo sometimes extends 

 beyond the pedilateral margin, and the hinge is quite at the extremity of the shell ; the 

 ventral margin in some specimens has a slight curve inwardly, with the impression of 

 adductors large and distinct ; the ribs are covered with nodules, and they are about as 

 wide as the depressed spaces between them. 



Mr. J. Sowerby, in ' Min. Conch.,' says that it occurs in Prance, but I have not been 

 able to ascertain its locality. 



In two or three of these oblong species there is a small distinct denticle on the pedal 

 side of the hinge in the left valve, with a depression for its reception in the right ; this is 

 immediately above the impression of the pedal muscle. Fig. 18, Tab. XXII, represents 

 what I at first thought might be specifically distinct, the umbo projecting beyond the 

 margin, with more depressed and rounded ribs, which are less tuberculated ; but I believe it 

 to be only a variety {C. oblonga, var. transversa). It is from the Fluvio-marine at Hordle. 



Fig. 10, Tab. XXII, represents another form, probably, of this species; it had in MS. 

 the name C. serratina. It is not so tumid as the normal form, it is less transverse, and 

 the costae are more regularly nodulous. I think it is only a variety It was found at 

 Mead End, Headon Hill, and Barton. 



Fig. 11, Tab. XXI, represents a small specimen in Mr. Edwards's cabinet, which at 

 one time I thought might be a distinct species ; but having only one specimen, and that, 

 perhaps, distorted, I have considered it as a variety {C. oblonga, var. trapezoidalis). It is 

 from High Chfi", Barton. 



13. Cardita patjcicostata, Sandberger. Tab. XXII, fig. 6, a, b, c. 



Cardita paucicostata, Sandb. Concli. d. Mainz. Beckens, p. 337, t. 24, f. 6, 1863. 



Spec. Char. C. Testa rotundato-trigonuld, crassd, convexiusculd, costatd, costis paucis, 

 elevatisy nodosis, distantibus ; subinaquilaterali ; lunula brevi, concavd ; wnbonibus obliquis 



