162 PYRAMIDELLID^. 



rest of the shell is as usual in the typical form. The 

 Milford specimens appear also to be intermediate. 



The variety is the Turritella indistincia of Fleming, 

 T. interrupt a of Totten^ and Eulima decussata of Mac- 

 gillivray. 



29. O. RUFA^, Philippi. 



Melania (afterwards Chemnitzia) rufa, Phil. Moll. Sic. i. p. 156, t. ix. f. 7. 

 C. rufa, R & II. iii. p. 245, pi. xciii. f. 4. 



Body of a clear pale-azure colour, irregularly aspersed with 

 snow-white flakes : snout extending from the conjoined ten- 

 tacular membrane to a little beyond the foot, and forming a 

 sort of head- veil ; it is long, flat, and bilobed : tentacles short, 

 broad, very little folded, and diverging ; tips rounded : ojes 

 placed on the inner bases of the tentacles : foot large, mode- 

 rately long, aurieled in front, tapering behind to a point when 

 at full stretch, but rounded when at rest. (Clark.) 



Shell forming an attenuated cone, moderately solid, opaque, 

 and glossy : sculpture^ narrow and shallow longitudinal ribs, 

 from 20 to 30 on the body- whorl ; they are nearly straight, 

 and never reach the base, being sharper and more distinct on 

 the upper whorls ; their interstices are crossed, and the base 

 encircled, by rather broad impressed lines, of which there are 

 from 8 to 10 below the periphery, and 4 to 6 above it ; these 

 lines, when magnified, appear double, or sometimes composed 

 of several threads ; the whole surface is covered with micro- 

 scopic and close-set striae in the line of growth ; nucleus 

 quite smooth : colour pale-fawn or tawny, with frequently a 

 narrow reddish-brown or orange band round the middle of 

 each whorl: spire greatly elongated, tapering to a rounded 

 point which forms the nucleus ; this is remarkably prominent 

 and exposes the reversed and compact spire of the embryo, 

 which bends downwards on the first regular whorl in various 

 directions: ivhorls 10-13 (exclusive of the nucleus), convex 

 although more or less compressed, and gradually enlarging; 

 the last occupies from a third to a fourth of the shell : sii- 

 ture narrow and deep, slightly oblique : mouth irregularly 

 rhomboidal, acute-angled above and expanded below ; length 

 from a fifth to a sixth of the spire : outer lip somewhat con- 

 tracted, very little incurved below the periphery : inner lip 



* Keddish. 



