VERMETUS. 183 



. Doubtful^and Unfigured Species of Thylacodes. 

 Y. CUVJERI, Risso (PL 48, fig. 19). Southern Europe. 



This unrecognized species is the type of the subgenus Lemcn- 

 tina, Risso, distinguished by the remarkably radiated metapo- 

 dium. Dr. Gray regarded it as " probably only a badly described 

 and figured Serpuloides arenarius. n 



Y. ORYZATA, and var. ANNULATUS, Morch. Panama. 



Y. RUMPHII, Blainv. (V. protensa, Dillw., V. vormium, Petiv.). 



Nab. unknown. 



Y. PROTENSUS, Gmel. Hab.' unknown. 



Y. SCABER, Gravenhorst. Hab. unknown. 



Y. NATALENSIS, Morch. So. Africa. 



Y. ERUCIFORMIS, and vars. ERYTHROSCLERA and LUMBRICELLA, 



Morch. California. 



Y. RIISET, and vars. MUHLENPFORDET, and LIMACELLA, Morch. 



West Indies. 

 Y. TURONIUS, Rouss. Definitely ascertained to be a fossil. See 



Yaillant, Nouv. Arch, du Mus., 193, 1871. 



Y. ANNULUS, Rouss. Hab. unknown. 



Y. SELECTUS, Monts. and vars. ARBOREA and RAMOSA. 



Mediterranean Sea. 



Y. MELANOSTOMUS, Morch. Zanzibar. 



Y. SIP HO, Lam. Timor. 



Y. LAMARCKII, Yaillant. Australia. 



Subgenus SIPHONIUM (Browne. 1756), Morch, 1859. 

 Y. LITUELLA, Morch. PI. 54, fig. 82. 



Variously twisted, often openly spiral, laterally attached and 

 deeply immersed, with a median carina or rib above, which is 

 more or less nodulous, and close, rugose incremental lines ; color 

 whitish or ash, often obsoletely brown clouded, early whorls 

 chestnut colored. California, on Haliotis, etc. 



It is V. ammoniformis, Serres. 



Y. AFRUM, Gmel. PL 54, fig. 83. 



Yery solid, white, corroding and attached lateralh-, spiral, 

 becoming thinner towards the aperture, with a superior rib and 

 obsolete longitudinal striae, distant incremental sulci, and close 

 arcuate incremental striae. Gaboon, W..Africa, on Chama. 



It is " Le Datin " of Adanson, 



