384 PTEROPODA. 



S. Flemingii, Forbes. 



With the body whorl very ventricose; the spire of four whorls, 

 but not forming half the length of the shell. 



Plate LVII. fig. 4, 5. 



Chkmn. Conch. Cab. vol. ix. pt. 1, p. 129, pi. 113, f. 972, 973 (?). 

 Fusus retroversus, Fleming, Mem. Worn. Soc. vol. iv. p. 498, pi. 15, f. 2. ; 



British Animals, p. 349 ; Treatise on Mollusc. Animals (from 



Encycl. Brit.), pi. 12, f. 45. — British Marine Conchology, 



p. 201. 

 Sctea stenogyra, Philippi, Moll. Sicil. vol. ii. p. 1G4, pi. 25, f. 20 (probably). 

 Peracle Flemingii, Forbes in Brit. Assoc. Beport, for 1848, p. 249. — Jeffu. 



Ann. Nat. H. vol. xx. p. 16. 



This very minute shell — it is not very much larger than 

 an ordinary pin's head — was discovered by Dr. Fleming", 

 and, from its striking resemblance to many species of the 

 genus, was considered by him as a reversed Fusus. It is 

 very thin, transparent, shining, smooth, of a clear horn 

 colour, and more or less iridescent when living, of a 

 porcelain white when dead. Its general outline is not 

 unlike that of a boy's peg-top. The body-whorl is very 

 ventricose, and short in proportion to its breadth ; it 

 exceeds in vertical length the entire pyramidal spire, 

 which is composed of four very narrow, well defined 

 whorls, that terminate in an extremely small, but blunt 

 or even depressed point. These volutions are rounded, 

 but are so far subangulately flattened above, as to appear 

 obtusely subscalariform. The base is rounded, but is still 

 a little depressed, that is to say, the attenuation is rather 

 abrupt. The mouth is narrow and ear-shaped ; it occupies 

 at least half the length of the shell, but is not equal to 

 half the basal diameter ; it is attenuated and effuse at the 

 bottom, and not truncated, as it seems in our engraving. 



