102 PYRAMIDELLID.E. 



animation ; it readily creeps up the deepest glasses, and, 

 however often brushed down, starts again with unabated 

 vigour" (Clark). 



It is the Turbo albidus of Adams's work on the Mi- 

 croscope (from Walker's figure), and Turritella Clealan- 

 diana of Leach. The latter writer was of opinion that 

 " unicus is a very improper name for a species." Surely 

 no shell has a better claim than the present to be con- 

 sidered alone of its kind, or unparalleled, which is the 

 the meaning of the name. It once belonged to the 

 genus Turbo, afterwards to Turritella, then to Chemnitzia 

 (or Odostomia) , since to Aclis, and it was last trans- 

 ferred to Rissoa. Our dainty Ariel has long served 

 many masters, and perhaps it is time that he should 

 have his liberty. Should such an emancipation take 

 place, and a new genus be required for the distinction of 

 this unique species, Graphis might be a suitable name. 



2. A. as'caris*, Turton. 



Turbo ascaris, Turt. Conch. Diet. p. 217. A. ascaris, F. & H. iii. p. 219, 

 pi. lxxxviii. f. 8. 



Shell forming an elongated and slender cone, rather solid 

 for its size, semitransparent, and somewhat glossy : sculpture, 

 strong spiral ridges, of which there are 5 on the body-whorl, 

 and three or four on each of the other whorls ; the uppermost 

 ridge on each whorl is placed at some little distance from the 

 suture ; the base of the shell is smooth ; some slight and fiex- 

 uous longitudinal striae or wrinkles may be detected by using 

 a Coddington lens : colour milk-white : spire tapering to ap- 

 parently a fine point: whorls 8-9, convex in the middle, but com- 

 pressed or sloping on the upper part of each towards the suture ; 

 they enlarge rather suddenly : suture deep and rather oblique : 

 mouth exactly oval, effuse below : outer lip slightly flexuous, 

 incurved above, more or less thickened near the edge, so as 

 occasionally to form a varix in an earlier stage of growth : 

 inner lip somewhat thickened and adhering to the pillar, re- 



* A tapeworm. 



