370 Prof. Germav on the Pel lif actions of Osterdoeddigen. 



Two specimens were collected of a small Cerithhimy quite 

 smooth, and half an inch in length ; and amongst the casts 

 were some which appeared to belong to this genus. 



Casts of the genus Fasciolaria were found in great abun- 

 dance, all of wliich, however, appeared to belong to one or two 

 species also found m a fossil state, and which, in the state of 

 casts, would be ranged with Bnccinites. Some casts likewise 

 occurred, which were most probably derived from a Pijnda. 

 Turbinated shells in the state of casts were not unfi-equently 

 found, which originated in all probability from species of the 

 genus J//5//5, and which presented three fossil shells of smaller 

 species, one of them with its volutions from left to right. 



Amongst Bivalves, the Osfracitcs occupied the first place 

 with respect to their abundance. Single valves of a very thick- 

 shelled oyster occurred frequently, the diameter of which some- 

 times measured about five inches, and which may perhaps 

 belong to Ostren hiaurimlaia Lam. Smaller species also oc- 

 curred, in part regularly grooved ; but no specimens were met 

 with of die mantle pcdens or of Cristacites. The very strength 

 of this shell {Ostrea) appears to have effected its preservation, 

 for scarcely any casts of it were found ; casts of bivalves were 

 rare in proportion* 



A small, elliptical, finely-ribbed Tcrebratida, with a perfo- 

 rated beak, and internal cartilage still preserved, perhaps be- 

 longing to Terchratula radiuta Lam., was found in some spe- 

 cimens. A small concentrically striated shell was more fre- 

 quently met with, the beak of which was not perforated, and 

 which did not exhibit its cartilage, but was provided with a 

 notch in the beak, below the hinge, through which the muscle 

 of attachment had probably passed. This species appears to 

 belong to a peculiar genus hitherto unknown. 



The genus Area yielded two species, one of the breadth of 

 half an inch, finely decussated, the margin not crenulated, and 

 the hinge very narrow; and one, a fourth of the size, with di- 

 stinct excentric ribs and toothed margin. Two or three small 

 species of Pectunculus occurred, but not in specimens suffi- 

 ciently distinguishable. 



Cockles were rare: some imperfect specimens were found, 

 however, which undoubtedly belonged to the genus Cardium. 

 Some casts appeared, by their outlines, to belong to Tellina. 



Of Veneres^ occurring so frequently amongst fossil shells 

 at other places, two species only were found here, and those 

 not rare ones ; the one a lai'ger, of about four lines diameter, 

 with fine distant concentric stree, and another of half the size 

 mare distmctly and more closely striated. Two species of 

 the genus Venericardia Lam. were found pretty frequently, 



both 



