132 PATAGONIAN EXPEDITIONS 1 PALEONTOLOGY. 



ture, but until we know the interior of the shell and the hinge, it is im- 

 possible to say whether there are closer relations to any of them. 



Fam. CARDIID^. Fisch. 



Gen. CARDIUM L. 

 57. CARDIUM PHILIPPII v. Ihering. 



PI. XXVII, Fig. 6. 



1887 C. multiradiatum Philippi, Tert. & Quart. Verst. Chiles, p. 178 (pro 



parte, non C. miiltiradiatnm Sowerby). 



1897 C- philippiiv. Ihering, in: Rev. Mus. Paul., v. 2, p. 49, pi. 6, f. 40. 

 1899 C. ph. var. paiiciradiata v. Ihering, in: N. Jahrb. Miner., etc., v. 2, 



P- IS- 



Shell large, subglobular, with about 45 radiating ribs, of which i or 2 

 near the anterior end are large and geminate. The other ribs are high 

 and smooth, those of the posterior end finer and tuberculate. 



Remarks: Our specimens are all badly preserved, but they agree, espe- 

 cially those from Santa Cruz, with v. Ihering's species, which is, according 

 to v. Ihering, different from C. multiradiatum of Sowerby. They seem 

 to correspond to the variety paiiciradiata. Our best individual shows 

 only one geminate rib anteriorly. 



Two casts from Lake Pueyrredon, 600' above base, show distinctly 2 

 larger geminate ribs. One of them is very small (about as large as the 

 following species), but it is distinguished at once by the smaller number 

 of ribs. 



The casts from Arroyo Gio are doubtful : only traces of the ribs are 

 seen, which seem to correspond to this species. 



Record of specimens : Mouth of Santa Cruz River, 2 right valves, and 

 several fragments ; Arroyo Gio, 2 casts ; east end of Lake Pueyrredon, i 

 cast; Lake Pueyrredon, base of Tertiary, i cast; Lake Pueyrredon, 600' 

 above base, 6 casts. 



Distribution : Suprapatagonian beds of Jegua quemada, and Patagonian 

 beds of Santa Cruz (v. Ih.); Santa Cruz (Phil.). 



