344 M. O A. L. MORCh's REVIEW OF THE VERMETID^. [Nov. 12, 



distinctly over into the preceding fonns, that I do not doubt they are 

 identical. Although I have no specimens to prove that a similar 

 transition takes place between the forms called Aletes and Vermetus 

 from the west coast of America, I do not doubt that this will be found 

 to be the case on comparing larger suites of specimens. 



On the upper side of the operculum are some cylindrical bodies 

 Iving on the side ; but I suppose they are foreign bodies. The lobated 

 edge mentioned in 'Journ. de Couch.,' from a single specimen, is only 

 the effect of desiccation. 



Var. 7j. 



T. ut preecedentis, sed substantia crassa. 



Hab. Ins. St. Thomas {1. H. Riise). 



4. VERMETts (Thylacodus) contortvs. Carp. 1857. 



Bironia contorta, Carp. Cat. p. 305. no. 355. 

 "i Vermetus glomeratus, Mke. Zeitschr. 1857, p. 178. no. 4, and 

 1850, p. 165. no. 14 ; Adams, Panama, p. 21^. no. 323? 



T. soUtarin, lateraliter affixa {quondaiii), badia, tenuiuscula, irre- 

 gulariter contorta ; anfr. graciles, teretes, fere uhxque aquaJes, 

 irregulariteraliussuperaliumdecUriteretspiraliterincumbentes; 

 aiifr. primi plerumque contigui, idtiini disjuncti, lirulis longitu- 

 dinalibus approxirnatis, rvgis re/ plicis incremenli decussatis, 

 wde reticulati, intersectionibus obsoletissime nodulosis ; anfr. 

 ultimus porrectus Iceriusculus, jiaUidus, latere affixo ferrvgineo 

 rudi, irregidari ; varice manicceformi in anfr. penidtimo ; colu- 

 mella in anfr. medianis liris 3-5 disfinctis, harum tribv.s su- 

 perioribus ajjproximatis. 



Diam. aperturae 3| m. (ex specim. orig. Carpenteri). 



Hab. Gulf of CaUfomia {llus. Cuming). 



I have not seen any laminae inside, but, from the great resemblance 

 of the 3-5 spiral lirse on the columella* with those of the preceding 

 species, I believe they will be found iu other specimens. This 

 species resembles most in shape var. o of V. conicus. Dill., but is a 

 Thylacodus. The opercula, supposed by Mr. Carpenter to belong 

 to this species, are more likely those of Spiroglyphus albidus, Carp. 



Var. a. repens (Thylacodls). 



T. lateraliter affixa, irregulariter spiralis, solida ; anfr. plerurn- 

 que contigui ampliores quam in sp. prceced. ; anfr. ultimus 

 longus, rectus, repens nee solutus ; intus callo lineari lacteo. 



Diam. aperturse 4 m. 



Hab. Gulf of California, on Margaritifera (Mus. Cuming). 



In the broken end the columellar hnes are not to be seen distinctly, 

 but only a white linear keel which seems situated on the walls of the 

 whorl. 



This species is perhaps a state of F. (Petaloconchus) macro- 

 pliragma. 



* Not mentioned by Carpenter, because the shell was not opened by him. 



