ON THE SUB-WEALDEN EXPLORATION. 25 
Lye., and another species which is apparently new. We have also observed 
some specimens of a small elongated ribbed Astarte which appears to be new. 
In the Sixth Report Astarte aliena, Phil., was mentioned, and in the 
Seventh Report Astarte Autissiodorensis, Cotteau. More careful examination of 
a greater number of specimens has shown that these names cannot be retained. 
The small ribbed Astartes of the boring'vary a little in size and in the number 
and character of their ribs ; but it seems preferable to regard them all as slight 
varieties of the Astarte Mysis of De Loriol. The ribs are always less in 
number than in the true Astarte Autissiodorensis. 
Considerable difficulty has occurred in naming the Cardiums. The French 
palwontologists have founded several species upon what most English paleon- 
tologists would regard as simply varieties of the original Cardiwm striatulum 
of Sowerby. In the higher part of the boring the Cardiums are large, 
and may with tolerable certainty be referred to C. striatulum. In the lower 
part, both in the Oxford and Kimmeridge Clays, the shells are smaller. 
MM. Sauvage and Rigaux have described similar shells from the Kimmeridge 
Clay of the Boulonnais as Cardium lepidum. It may perhaps be advisable 
to retain this name, regarding the shell, however, as a variety of C. striatulum 
and not a distinct species. 
The following is a list of all the fossils hitherto observed. Those species 
which occur in both the Oxford Clay and Kimmeridge Clay are marked 
with an asterisk. 
List of Fossils from the Kimmeridge Clay. 
Serpula. Attached to Cardium at 842 and 847 feet. 
Cidaris Boloniensis, Wright. At 397 feet. 
Discina Humphrisiana, Sow. At 569 and 570 feet. 
D. latissima, Sow. Common. 
*Lingula ovalist, Sow. Common. 
Arca. Species not determined. Tolerably abundant. 
Avicula. Rather rare. 380, 420, 438, 456, 952 feet. 
Astarte Hartwellensis, Sow. It is not easy to distinguish fragments of this 
shell from Thracia depressa. 
A. ovata, W. Smith. At 570 feet. 
A. Mysis, D’Orbigny. Common. 
Astarte, new sp. 463 feet. 
*Qardium striatulum, Sow. Common, especially in the higher part. 
*(. striatulum, var. lepidum, Sauvage et Rigaux. 813, 814, 817, 818, 
898, 913, 925 feet. 
Corbula. 784 feet. 
Gryphea nana, Sow. 430, 900, 902 feet. 
G. virgula, Defr. Several crushed specimens at 913 feet; a perfect form 
at 950 feet. 
Hinnites? 478 feet. 
Leda. 494 feet. 
Leda, allied to L. Dammariensis, Duv. 415, 511 feet. 
Lima. 380, 804 feet. 
Incina. 415, 465, 493 feet. 
+ There is a Lingula in the Oxford Clay, which is distinguished from Z. ovalis only by 
its size, it being always small, whilst L. ovalis varies much in size. Mr. Dayidson pro- 
poses to distinguish the Oxford-Clay she]l by a new specific name. 
