NEOZOIC INVERTEBRATES 109 



Clavellithes ? sp. 

 Locality. Upper beds, 3373. 



An imperfect gastropod fossil which has the aspect of a Clavellt- 

 thes is among the specimens collected. 



Chrysodomus sp. 



Locality. Upper beds, 3375. 



A specimen which appears to be the internal cast of a Chrysodo- 

 mus was collected. The upper part of the spire and most of the canal 

 are missing. On the upper of the two whorls present there appears 

 to have been a single strong carina, somewhat wavy or nodulous, and 

 a little above the middle of the whorl, forming a sloping but very 

 marked shoulder ; on the second or body whorl there are three feebler 

 spiral ridges below the shoulder, and about equidistant. The canal is 

 recurved and was apparently short. The height of the body whorl, 

 from the beginning of the canal to the suture, is 27, and the diameter 



35 mm - 



This shell is of the type of Chrysodomus liratus Martyn, and of- 

 fers an example of the persistence of a particular type in a given region 

 which is very interesting. 



Rimella? ? sp. 



Locality. Upper beds, 3373. 



A fragment of a gastropod which recalls the surface of Rimella 

 simplex Gabb, from the Californian Eocene, is among the material 

 collected, but the generic determination is far from being certain. 



Cassis sp. 



Locality. Lower beds, 3377. 



The canal and back of the body whorl of a Cassis somewhat resem- 

 bling the C. shubutensis from the Eocene of Shubuta, Miss., are visi- 

 ble in a piece of shale from the locality above mentioned. The speci- 

 men is more elongated thanC. shubutensis^ is covered with finer spiral 

 sculpture, and exhibits five rather feeble nodulations on the shoulder 

 of the whorl ; presumably the whole shell had ten or twelve of these. 

 The length of the portion preserved is 17, and the diameter 11.5 mm. 



Cerithium? sp. 



Locality. Upper beds, 3373. 



Two fragments of what is probably a Cerithioid shell are preserved. 

 They have rounded whorls with deep sutures, the upper whorls with 

 feeble sculpture, the basal whorl with six or more strong spiral ribs. 

 There is no evidence of axial sculpture of any strength. The shell 



