October, 1S44.] 97 



own marl pits, at the Grove, with the P. Mortoni, but more rarely. 

 I have fragments of larger specimens than the one described ; from 

 these fragments it is probable that both valves are convex, one a 

 little more so than the other. 



I have dedicated this species to our learned herpetologist, Profes- 

 sor Holbrook, of Charleston, S. C. 



Genus TEREBRATULA. 



Terebratula canipes. Specific character. Larger valve, pear- 

 shaped, convex ; beak rather large and prominent ; seven plaits ex- 

 tending from the anterior, and part of the lateral margin to about 

 two-thirds of the shell towards the beak, three of these occupying 

 the middle, and two others, less prominent, each of the sides: mar- 

 gin deeply toothed by the plaits. Length 1| inches, width 1 3-8 

 inches. 



I found a single valve in the limestone thrown out for agricul- 

 tural purposes at the Plantation of Dr. J. G. Prioleau, in St. John's 

 Parish, S. C, about five miles south of Black Oak, on the Santee 

 Canal. It was associated with fragments and casts of various 

 species which could not be determined with certainty, with the ex- 

 ception of "Pecten calvatus," (Morton,) "Ostrea panda," (Morton,) 

 and " Scutella Lyelli," Pileus sinensis, (nobis.) 



The marl on this property is conveniently obtained from the 

 bottom of a small creek, which is often nearly dry, and as it varies 

 in hardness, the deposit has been examined at different spots within 

 a half mile. At one of these places, about 200 yards from that at 

 which I found this Terebratula, the Scutella pileus-sinensis is cu- 

 riously abundant and perfect, and is almost the only fossil which 

 can be determined. In a few cart loads thrown out, and not used 

 from being too hard, thousands of this fossil are visible. 



Unfortunately, the rock is generally too hard to permit their re- 

 moval ; occasionally a good specimen may be procured, but gene- 

 rally they are broken in the effort to separate them. 



Genus SCUTELLA. 

 Scutella pileus-sinensis. — (Mandarin's hat.) Specific character: 

 Orbicular; posterior margin slightly truncated, with two slight in- 

 dentations opposite the posterior ambulacra; margin thin, least so 

 anteriorly. 



