F. & H. iii. 



354 NASSID/E. 



4. N. pyg'mjEa*, Lamarck. 



RaneUa pygmaa, Lam. An. s. V. vii. p. 154. N. pygmcea, F. & ! 

 p. 394, pi. cviii. f. 5, 6, and (animal) pi. LL. f. 2, as N. varicosa 



Body more slender and invariably of a much lighter colour 

 than that of N. incrassata ; the pallial tube and tentacles are 

 longer ; the anterior processes of the foot are larger and more 

 recurved ; and the tail is not only forked, but has two long 

 and pointed diverging filaments. (Clark and F. & H.) 



Shell not so stout and thick as the last species, of a more 

 delicate texture, and decidedly glossy : sculpture as in N. incras- 

 sata, but the ribs are finer ; there are from 15 to 22 on the 

 body- whorl, 15 or 16 on the penultimate whorl, 12 on the next, 

 becoming gradually less upwards ; the labial rib is larger, 

 and one or more of the whorls are varicose, or have extra labial 

 ribs denoting previous periods of growth or repose ; the spiral 

 ridges or striae are likewise fewer, never exceeding 12 on the 

 body-whorl, and 6 on the preceding whorl ; points of cancel- 

 lation granular, instead of elongated tubercles ; basal ridges 

 fewer and stronger : colour uniform yellowish-white with a 

 tawny tinge ; the labial rib and varices are nearly white and 

 very conspicuous ; mouth purplish-brown throughout (there 

 being no basal spot as in the last species) ; apex never purple 

 or pink, although sometimes ambercolour : spire less abrupt : 

 tuhorls evenly rounded, instead of angulated : suture not quite 

 so deep : mouth less contracted : canal broader : outer lip not 

 so much compressed above ; inside fluting more prominent and 

 tooth-like : inner lip thicker at the edge ; plaits fewer, and 

 not so wrinkly: pillar having a sharper fold : operculum more 

 deeply serrated on the inner edge. L. 0-45. B. 0*225. 



Habitat : Coralline zone on the South Devon, Dorset, 

 and Cornish coasts ; Connemara (Alcock) ; Bantry Bay 

 (M f Andrew, fide Thompson) ; Dublin Bay (Kinahan) ; 

 co. Antrim (Waller). Brick-earth on the Nar, West 

 Norfolk (Rose) ; Belfast deposit, with N. incrassata 

 (Grainger) . Norway, with the last species, 10-40 f. 

 (Danielssen and Asbjbrnsen) ; Bohuslan(Loven) ; and,with 

 the same, 4-100 f. (Malm); French coasts of the Atlantic 

 and Mediterranean (Lucas, fide Lamarck and others) ; 



* From its pigmy size as a Ranclla. 



