1861.] M. O. A. L. MORCh's REVIEW OF THE VERMETID^. 32/ 



differs in having the central mammilla conical and not cylindrical. 

 The colour of the shell is generally brown, often white with brown 

 transverse bands. Chemnitz and Carpenter regard the genus as 

 being sinistral ; but I cannot see any difference between it and the 

 other Vermeti. 



1. Spiroglyphus spiRULiFORMis, Dc Serrcs, 1855. 



" Cette espece est caracterise par le dernier tour de'tache des pre- 

 miers, qui se prolongent dans I'age adulte en un tube legcrement re- 

 courbe bien au-dela de la spire orbiculaire formee par I'ensemble de ces 

 memes tours. Diam. 0"-026 a 0028."— M. de Serves. 



Stoa spirulcsformis, De Serres, Annales des Sciences, v. p. 241, 

 t. 8 c. f. 1 . 



" La Stoa spirulaformis a ete rencontree sur la Pinna nigrina, 

 coquille decrite par Lam. comme de la mer des Indes, tandis que 

 nous I'avons re9ue de I'ile de Zanzibar. Quant a la St. spirulce- 

 formis, elle parait habiter sur les valves de quelques Modioles de 

 I'ocean Atlantique boreal, ainsi que des cotes de I'Amerique septen- 

 trionale." 



The specimen represented is most probably from Zanzibar, the 

 American locality being very likely wrong, which is not improbable 

 from the curious form of the sentence commencing with " Quant," 



I have not seen any shell corresponding to the representation 

 quoted. The first whorls appear to be smooth, in which respect it 

 differs from all the following varieties. It is stated that the speci- 

 men is represented of the natural size, and double as large as S. 

 per/orans ; but fig. 6, the natural size of the latter species, is, on the 

 contrary, represented somewhat larger. 



Var. a. SCAPHITOIDES. 



T, forma Scaphitis twanii parum immersa ; anfr. obtuse quadran- 

 gulares; anfr. juveniles bnllati Iceves castanei; anfr. sequentes 

 planorhiformes, superne planati, liris incrementi arcuatis ap- 

 proximatis regularibus ; anfr. ultitnus rectus, versus aperturam 

 solutus incurvus, latere externa piano, laminis incrementi de- 

 planatis arcuatis convexis, superne planatus, laminis incrementi 

 crassis arcuatis reductis, antice profunde excavatis, plerumque 

 duplicatis. Color badius, aperturam versus cinereus ; fascia 

 lateralis castanea. Apertura ovalis leviter contractu. 



Diam. spirse circ. 4 m., long. 8 m., diam. ap. 1 m., diam. anfr. 



Hab, Ins. Philippin., on a young specimen of Margaritifera 

 muricata. Reeve ; of the same shape as the preceding, but much 

 smaller {coll. Cuming). 



Var. /3. VORTEX. 



T. planorboides ; anfr. angulati cinerei, superne plani, linea lata 

 badia submediana, latninis incrementi irregularibus subremotis, 

 arcuatis, antice hiantibus. 



Diam. ap. 5-6 m., dm. apertura li m. 



