516 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Zaphysema tunicata (C. B. Ad.). 



Woods opposite Cedar Hill, near Mandeville; Kendal road; ridge 

 near Lincoln; Somerset. 



This is Helix tumida Pfr. not Gmelin. 

 Zaphysema tenerrima (C. B. Ad.). 



Woods opposite Cedar Hill; Somerset. 



Proserpinula margaritella n. sp. 



Wesley Mount Church, near Williamsfield. 



Proserpinula infortunata (Bland). 



Helix infortunata Bid., Annals and Lvc. Xat. Hist, of N. Y., VI, 1S54, 

 p. 78; 1855, p. 149. 



Woods opposite Cedar Hill, and at Kino- Edward's Hotel; Somerset. 



Bland in 1854 transferred this species from Proserpina to Helix 



on the ground that in it the internal partitions are not absorbed, as 



they are in the Proserpinidce. In 1855 he 

 stated, on the authority of the Hon. Edward 

 Chitty, that the animal "is the same as of 

 Helix." Albers (Die Heliceen, 1860, p. 77) 

 instituted the new group Proserpinula which he 



Fig. 2. Central and ranks as a subgenus of Sagda, placing in it the 



lateral teeth of P. S p ec [ es discoidea C. B. Ad. and opalina C. B. Ad. 



(= infortunata Bid.). Tryon in Vol. II of the 

 Manual of Conchology, p. 201, considers Proserpinula a section of 

 Zonites. 



The radula of a decayed specimen we have examined was imperfect, 

 only the central and lateral teeth being preserved. These are of the 

 type found in Thysanophora, Sagda and Zaphysema. The central has 

 a short, wide basal-plate, the mesocone projecting well beyond it, side 

 cusps well developed. The laterals (at least 11 on each side) are 

 similar but asymmetrical by suppression of the entocone (Fig. 2). 

 P. infortunata is oviparous, the egg-capsules rather large, with calca- 

 reous shell. 

 Thysanophora turbiniformis (Pfr.). 



Sterridge's place, 3 miles southeast of Mandeville; Lower Santa 

 Cruz road; Somerset. 



Thysanophora subpyramidalis (C. B. Ad.). 



Woods opposite Cedar Hill; Lower Santa Cruz road; ridge near 

 Lincoln, Somerset. 



Thysanophora depressa (C. B. Ad.). 



Benmore, Mandeville; Cedar Hill; Lower Santa Cruz road; Som- 

 erset road. 



