308 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Raleta diflfers from tlie latter only in having a narrow central 

 pit, its right valve with a strong conical tooth falling into the 

 large pit before the tooth in the left valve." 



Realiii, 18-10. In 1841 the type cited as " i? -? n.s. " ; therefore 



still a nomen 7iudnm at that date. 



Risella, 1840. 1842, p. 60. " Rixella is like Littorina, but the shell 

 is top-shaped, the whorls keeled, and the mouth rather square." 



Scaphura, 1840. 1847. Scaphula. 



Senilia, 1840. 1842, p. 81. "The Senilia have very thick shells, 

 covered with a smooth olive periostraca ; tlie hinge teeth are all 

 e(pially transverse." 



Sidulch 1840. 1842, p. 70. "The Scarahis, like Ranella, forms half 

 a whorl between each period of rest, the thickened and retiexed 

 parts of the lips forming an edge to each side of the shell. The 

 8idul(e have a sharp internal ridge to the outer lip." 



Slrigella, 1840. 1847. StHqilla. 



Styliger, 1840. 1847. Stylifer. 



Talonia, 1840. 1842, p. 76. See note under Barnia. 



Talopia, 1840. 1842, p. 57. See note under Camitia. 



Tania, 1840. 1842, p. 60. "The genera 2'ania, Anculosa ,and lo 

 have the mouth of the shell truncated in front of the axis, as in 

 Achatina, the former having a turreted, the second an ovate 

 short, and the latter a fusiform shell with a large mouth." 



Tapada, 1840. In 1847 given as a synonym of Catitateus, Kisso, 1826. 



Teihija, 1840. 1847. Tdhys. 



Thaira, 1840. 1847. 2uira. 



T/iaiotia, \S-10. 1812, p. 57. "In Ziziphinus, Cantharidns, and 

 Thalotia the mouth is oblong and simple and the axis of the shell 

 is covered by the inner lip; the former is top-shaped, the 

 Cantharidi are ovate and green within." 



Thecathera, 1840. 1847. Thecacera. 



Thicolia, 1840. 1842, p. 56. " The Thicolm chiefly differ from the 

 latter [^Phasianella] in the animal being less ornamented with 

 beards." In the Proc. Zool. Soc, 1847, Gray spells this name 

 Thicolea, and cites it as intended for Tricolea, Risso. 



'Tomala, 1842. 1842, p. 78. See note under Raleta. 



To7iichia, 1840, p. 123. 1840a, p. 126. "The Tonichia has the 

 upper surface of the mantle bald and cartilaginous, and the under 

 covered with a very hard striated skin." 



Torinia, 1840. 1842, p. 60. "■ Tor mi a differs [from Solarium'] in 

 having a nearly orbicular operculum, which is very convex and 

 marked with a spiral ridge looking like a pagoda," 



IValia, 1840. In 1847 the type f^iven as V.pusilla. 



Tripteres, 1840. 1847. Triptere. 



Tugonia, 1842. 1842, p. 78. " The Tagonia have the same kind of 

 process, but the shell is ovate, ventricose, with a large gape on 

 its short hinder slope." 

 Turbonel/a, IS-iO. 1847. ? Ttirbonilla. 



Velletui, 1840, p. 128. 1840a, p. 132. "The Velletioi differ in the 

 animal and shell being reversed, like the Physcey 



