328 



Sketch of the Geology of 



gures 



natural size. 



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In the same place I found two species of Mya» Only 

 a single valve of one species was noticed ; which ap- 



Mya 



The other is much 



smaller, and bears a strong resemblance to the Nucula 

 above described. It is renresmtprl hpln-ixr nf tViP 



natural 



size. 



two 



of another small bivalve, which resembles a Saxicava. 

 But I have not been able to separate the valves so as to 

 examine the hinge. The specimens are somewhat in- 

 jured ; but a drawing of the most perfect is here given of 

 the natural size. 



C 



At the same locality I noticed likewise a very small 

 species of Bulla ; but 1 obtained only one or two speci- 



norly, and in the truncation, which is so decided as to give an emar- 

 ginate appearance. The carinated fossa is Tery marked. The fold is 

 tiearly as distinct as in a Telli^a. , 



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