nS VERMEtUS. 



y. spiRORBis, Sowb. PI. 51, fig. 50. 



Planorbiform, white, smoothish, whorls not in contact. 



? Cape of Good Hope. 

 Y. ANNULATUS, Dauclin. PI. 51, figs. 51, 52. 



Irregularly- spiral, transversely lamellate. 



West Indies, on Shells. 



Yar. CORRODENS, (I'Orb. (fig. 51). Having a peripheral carination, 

 forming a tooth-like projection at the mouth. This is var. 

 dentifera of Mcirch. 



Yar. IRREGULARIS, d'Orb. (fig. 52). Brownish black, irregularly 

 contorted, transversely rugosely plicate. This is var. glome- 

 rata, Morch. 



Yar. TROCHicoLA, Morch (unfigured). 



Y. OLOMERATUS,- Bivona. PI. 51, fig. 53 ; PI. 52, figs. 55-58. 



Conglomerated, tubes cylindrical or subangulated, contorted, 

 transversely undulately rugose. Mediterranean Sea. 



MiJrch has vars. crustans and tubulosa = annulata. Lam. 

 (fig. 58). 



V. cristatus, Biondi, is the young of this species. Yaillant 

 remarks that Daudin's species is smaller than V. annulatus, Lam., 

 and corrodes the surface upon which it is attached ; as Daudin lias 

 priority he proposes for tlie Lamarckian species V. annulariuvi. 



Monterosato has substituted the name petrsea, because of Ser- 

 pida glomerata, Linn.; he adds a var. minor. 



Embr3'onal whorls smooth, projecting in the centre of the shell, 

 and not unlike a very small Amnicola. Has more regular whorls 

 and wants the tooth-like process of the carina in the aperture of 



V. annulatus. 



Doubtful and Unfgured Spiecies. 

 Serpula costalis and S. iNFUNDiBULUM,of Chenu's Illust. Conch. 

 Y. ALBIDUS, Carp. Mazatlan. 



Y. STRAMONiT^. Morch. ? Guinea. 



Y. ANGULiFERA, Monts. Ti'ijjoH. 



Y. PLANORBis, Dkr. PI. 52, fig. 59. 



Planorbiform, somewhat solid, white, carinated, transversely 

 sublamellate, whorls in contact. 



Japan, slightly immersed in the surface of 



Vermetus imbricatus, Dkr. 



