194 CONTRIBUTIONS 



T. Stokesii* Plate 6. Fig. 207. 



Description. Turbinolia cuneate, granulate, with twenty- 

 four longitudinal furrows ; furrows on each side ten, two 

 of which are incurved and extend nearly to the base on 

 each edge two, slightly curved and extending nearly to 

 the base ; base emarginate ; star elliptical ; lamellae rugose. 



Diam. 5-20ths, Length 7-20ths, Breadth 7-20ths, of an inch. 



The segment is a magnified view. 



Observations. This is a beautiful species, resembling 

 very slightly in outline the T. crispa^ (Lamarck). It is, 

 however, more cuneate, and the situation of the furrows 

 is different. The furrows on the sides of the Stokesii 

 are marked," and from the edge of the star converge nearly 

 to a point below the centre on each side. Anxious to dis- 

 cover if any of the Turbinolm possessed the same character 

 with some of the Lunulites, (the enclosing in the calcare- 

 ous matter a grain of sand as a point of commencement 

 of growth, or as a balance) I first opened specimens 

 of the Maclurii without success ; then specimens of the 

 Stokesii and Goldfussii, in both of which the grain was 

 found ; several pharetra were next examined, but in none 

 was it to be seen. Having but a single specimen of the 

 nana, I could not submit it to an examination. 



* I have placed on this species the name of the late secretary of the 

 Geological Society of London, distinguished for his activity in promot- 

 ing the knowledge of natural science. 



t See Goldfuss, vol. 1, p. 15, fig. 7. 



