332 M. O. A. L. MORCh's review of the VERMETIDiE. [NoV, 12, 



Var. 5. TROCHicoLA. 



T. gracilis varie torta, planorhiformis vel scaphitoides, profundis- 

 sime immersa, badia ; anfr. plani, lirulis incrementi arcuatis re- 

 gularibus vix prominentibus. 

 Diani. ap. 1|^ m. 



Hab. St. Thomas, on Livona pica, L., very deeply corroding, some- 

 times even under the surface, but not concealed. On Tectura 7ne- 

 lanosticta, Gm., in the same manner. This variety is perhaps more 

 nearly allied to Spirogl. stramonitce, M. 



Operculum (varietatis /8) solidum crassum coriaceum, superne 

 convexum vel fere hemisphcericuin, lira arctispirali nigra ; area 

 centrali plana vel interdum imtnersa atropurpurea, annulo coc- 

 cineo circumdata, fascia latiuscula peripherica Jlavescente ; in- 

 ferne planum, liris concentricis 3-4 pulcherrimis, lira externa 

 valida ; mammilla centrali cylindrica, vertice piano ruguloso ; 

 peripheria margine elevato angusto Icevi pallide coccineo, 



Var. c. 



Operculum superne area centrali elevata convexa, atro-purpurea 

 fascia coccinea circumdata, peripheria albescens ; inferne area 

 centrali {farinosa casu ?) liris 2—3 concentricis acutis, fascia 

 coccinea circumdata ; peripheria angusta, parum elevata, bipar- 

 tita pallide flava margine albescente ; mammilla centrali di- 

 stincta. 



From a specimen attached to Fissurella barbadensis. 



8. Spiroglyphus albidus. Carp. ? 



Operculum g, et forsan f?. Carp. Cat. p. 311. 

 Bivonia albida. Carp. Cat. Mazatl. p. 307? 



'T. parva, albida ; anfr. duobus primis Icevibus, turbinoideis, sub- 

 elevatis, postea amplectatis ; anfr. normalibus subregulariter 

 spiraliter contortis, marginibus subparallelis, ad sese plerumque, 

 ad concham alienam parum, adhcerentibus ; rugis concentricis 

 plus minusve expressis, spiralibus nullis." 

 Long. 22 m.; lat. '1 ; diam. ap. "03. 



Hab. Mazatlan : extremely rare, off Spondglus (Liverpool coll.). 

 The operculum g is without doubt that of a Spiroglgphus, and 

 not that of Bivonia contorta, var. indentata, as regarded not im- 

 probable by Carpenter. The operculum f differs from all the oper- 

 cula of this genus I have seen, in being thin and concave ; but as it 

 is stated to be closely resembling the operculum oi Bivonia glomerata, 

 Phil., I do not doubt it is truly congeneric, and perhaps conspecific, 

 as the opercula of this genus are excedingly variable in shape. That 

 it cannot belong to Bivonia contorta, as regarded probable by Car- 

 penter, seems evident to me, from the original specimen of Carpenter 

 showing distinct elevated lines on the columella, which proves it to be 

 that of a Vermetus. I have never seen any elevated columellar line 

 in a Spiroglyphus. 



