SOLIDULA-ACT^EON. 147 



very thin and sharp, white. Length '85 inch. Breadth *37 inch. 

 (Kirk). 



Wellington, New Zealand. Collected by Mr. C. Hollsworth. 



Bucdnulus gracilis KIRK, Trans. N. Z. Institute xiv, p. 268, 

 1881. 



This shell is easily distinguished from Bucdnulus Mrki Hutton, 

 {the type of which is in the Colonial Museum), by the greater num- 

 ber of whorls, its more elongate and less robust appearance, and by 

 the greater number and closer proximity of the spiral grooves. 

 {Kirk). 



S. HUTTONI Kirk. Unfigured. 



Whorls 6, with numerous fine spiral grooves. Columella with 

 double fold, but more prominent than in the preceding species. 

 Spire very short, giving a decidedly robust appearance to the 

 shell. Ground color, white with longitudinal brown wavy lines. 

 (Kirk). 



Waikanae, New Zealand. 



Bucdnulus huttoni KIRK, Tr. N. Z. Inst. xiv, p. 26S. 



Genus ACTJEON Montfort, 1810. 



Acteon MONTF., Conch. Syst. ii, p. 314. Action A. ADAMS, P. 

 Z. S. 1854, p. 58. Not Adceon Oken, l8l5,=Elysia Risso. Torna- 

 tella LAMARCK, Extr. du Cours de Zool. du Mus. d'Hist. Nat., etc., 

 p. 117, 1812 ; Anim. s. Vert, vi, p. 219, 1822. KEEVE, Conch, [con. 

 xv, and of other authors. Speo Risso, Hist. Nat. Eur. Merid. iv, 

 p. 235, 1826. Con/. PHILIPPI, Archiv. fiir. Naturg. 1841, p. 55, pi. 

 5, f. 10 (animal). SARS, Moll. Reg. Arct. Norv., p. 280, pi. xi, f. 1, 

 {dentition), and pi. xviii, f. 57 (operculum). 



Shell oval, spirally striate, with conical spire and impressed or 

 channelled suture. ' Aperture long, half the shell's length or more, 

 narrow above, broadly rounded below, the outer lip simple and acute ; 

 columella twisted into a strong, simple spiral fold. Parietal wall with- 

 out folds or teeth. Operculum corneous, shaped like the aperture, 

 few-whorled with nucleus near the basal margin. . Type A. torna- 

 tilis L. 



Animal having the cephalic shield squared in front, produced 

 behind in two triangular appendages, in front of the bases of which 

 the eyes are situated. Radula wide, with many longitudinal rows 



