386 PTEROPODA. 



We owe the discovery of this curious addition to our 

 Fauna, to Mr. M'Andrew who, iu June 1848, dredged 

 several specimens along with the preceding species in sixty 

 fathoms of water, fifteen miles to the south of Mizen Head, 

 south of Ireland. 



Its nearest ally appears to be the Spinalis Bulimoides of 

 D'Orbigny. 



S. Jeffreysii, Forbes and Hanley. 



Shell subdiscoid, spire much depressed, lip very acute, mu- 

 cronated. 



Plate LVII. fig. 8. 



This curious shell is easily distinguished from its British 

 congeners by its very much depressed spire. It is very 

 minute, very thin, fragile, and transparent. There are 

 three whorls, the outermost of which is large in proportion 

 and gently rounded ; the second is slightly elevated above 

 it, and the third very slightly above the second, so that its 

 termination forms a somewhat acute apex. The surface of 

 the whorls is quite smooth. The mouth is elliptically ovate ; 

 its outer lip is thin and gently curved ; the inner terminates 

 in an acute, rather short, canaliculated, somewhat curved 

 Cauda or mucro. 



The only specimen we have seen is contained in the 

 cabinet of its discoverer, Mr. Gwyn Jeffreys, who found it 

 on the shores of the British channel. It is nearly allied 

 to the Spirialis rostralis of Eydoux and Souleyet, a species 

 said by them to be very common in the ocean, and occur- 

 ring in myriads. 



