328 M. O. A. L. MORCH's REVIEW OF THE VERMETID.E. [Nov. 12, 



Operculum crassiusculum superne planum, lira arctlspirali, peri- 

 pheria membranacea, centra puncto impresso annulo obsoleto 

 circumdato ; inferne margine peripherico angusto bipartito, 

 parte interna sanguinea, parte externa jlavescente, centra mam- 

 milla latiuscula parum prominente. 



Diam. li millim. {coll. Cuming). 



Hab. Ins. Philippm.,on/fa^Jo^i«OOTwa,Chemn., slightly corroding. 



Var. y. LEMNISCATA. 



T. tenuiuscula, anfr. primi planorbiformes, anfr. ultimi lemnisca- 



tim contorti. 

 On the same shell as the preceding. 



Var. h. SPIRALIS. 



T. tenuis castanea fascia spirali lata alba, latviuscula, anfr. alio 

 super alium decliviter et spiraliter incumbentibus, striis incre- 

 menti obsoletis, lira spirali obsoletissima. 



On the same shell as the two preceding varieties. 



Five or six specimens agreeing with the above description differ 

 entirely in the manner of contortion from that known in the other 

 species ; but the transition to the planorboid varieties seems to me 

 so striking, that I do not dare to include it in another genus or spe- 

 cies. The striae of growth are bent in the same way as in the pre- 

 ceding, but are very rarely slightly foliaceous. It is deeply cor- 

 roding. 



V ar e. solidissima. 



T. crassa parum immersa planorboides vel lemniscatim contorta, 

 alba, in anfr. ultimo angulo laterali linea badia notata ; lamince 

 incrementi obsoletcB antice excavates, interstitiis scepe foveatis . 



Diam. aperturse fere 2 m. , 



Operculum solidum crassum atro-purpureum ; superne convexum 

 fere hemisphcericum, lirula arctlspirali obsoleta ; inferne mar- 

 gine peripherico elevato angusto incrassato sanguineo ; im- 

 pressio muscularis coneaviuscula, centra mammilla valida cylin- 

 drica prominente, vertice plana dilatato. Op. superne fascia 

 peripherica lataflava. 



Diam. fere l|^m. 



About ten specimens on Chama radiata, Lam. (Mus. Reg.). 



Var. ^, operculo dilute sanguineo. 



Operculum dilute sanguineum planum, mammilla centrali parva, 

 peripheria lamina tenui flava. 



On Turbo marmaratus, several specimens showing considerable 

 variations in colour and shape. The shells are so overgrown with 

 Nidlipo7-(S that they cannot be described. The colour is brown 

 inside, white outside. 



Var. >). IMMERSA. 



T. profundissime immersa; anfr, plani ; lirte incrementi nrcuatte 

 confertcB minutissimce. 



