SOLARIUM. 237 



umbilici crenato, corrugate-." Obs. An unmistakably young shell, 

 which 1 cannot well distinguish from a depressed form of hybri- 

 dum : the umbilicus, however, is unusually open, and the ordinary 

 infrasutural keel is not developed. 



24. cingulum (f. 55, 56), Kien. — T. S. hi/brido simillima, 

 sed multo major ; anfractus declives, baud superne tumidi, multo 

 magis expansi, vitta lata, fulva, srepius in strigis angustis ordi- 

 natim defluente, ita ut maculae Candida; magnas fere conrluentes 

 dimidium inferius confertim ornant (labrum versus color albus 

 fulvuin plerumque superat), superne picti ; basis semper pallida 

 fulva, concolor, porcis obsoletissimis circumcincta. Carina emi- 

 nens, et prae cingulis vicinis, magna : cingulum infra peripheriam 

 vel obscurum, vel angustum. Umbilici maxime coarctati cingulum 

 latissimum. Obs. Operculum circular, infundibuliform, mem- 

 branaceous ; its apex solid, mammillary, carved. 



25. lutetjm (f. 52, 53, 54), Zand: — T. subdepresso-conica, 

 lsevis, lutea aut fulva, ad cingulum suprasuturale unicum eleva- 

 tum zonamque infrasuturalem angustam, etiamque ad cingula 

 peripheric 2 (quam intervallum spiraliter striolatum angustiora) 

 albo et fusco-rufescente tenuiter articulata. Anfractus pauci, 

 rotundati. Sutura angusta. Basis rotundata, haud cingulata. 

 Crena: umbilici valde coarctati albse, latse, paucse. — Var. Basis 

 umbilicum versus rugis pliciformibus radiata. — Var. Zona obso- 

 leta; cingulum peripherics superius unice latius : basis planior. 



*** Sect. C. Torinia. 



26. perspectiviunculus,* (f. 59 to 64), Chemn. — T. figura 

 maxime varians, ssepe conoidea, nonnunquam orbiculari-subco- 



* A shell which, if not identical, must he nearly allied, is thus described by Valen- 

 ciennes in the Zoology to Humboldt and Bonpland's Voyage (vol. ii. [). 270) : — 



S. bicanaliculatum. — T. conica, subgrauulosa, albida, flammulis (multis) rubro- 

 fuscis elegauter picta ; apertura rotundata, umbilicum versus canalicidis 2 angulosis. 

 — Acapulco. 6-4 Un. 



The author remarks that the description of Heberti would mostly apply to it, but 

 that shell appears to have a coarser granulation, and three umbilical channels. The 

 belts, of which there are -1 upon each turn, and 6 upon the almost flat base, are but 

 slightly granulated. The mouth is rounded by the obsoleteness of the keel. There 

 are 2 ridges in the open umbilicus, the outer of which is the spiral keel whose white 

 grains gleam so conspicuously within it. 



Meuke, erudite, but ever obscure, has quoted two figures of perspectiviun cuius 

 (Geve, f. 275, and Chemn. f. 2708, 0) for his Euomplialus radiatus (Zeit.Malak. 1850, 

 p. 170), a shell referred I" I hat species by Carpenter, yet whose umbilicus suits not the 

 following description : — " T. orbiculata, convexo-depressa, spira planiuscula ; fusco- 

 nigra, albo radiata ; anfractibus 5, liris conspicuis dense granulato-crenatis, coufertis 

 einctis : ultimo rotundato, sulcis 2, latioribus juxta umbilicum patulum obsoletis ; 

 apertura circular], peristomatia acuti margiuibus callo tenui junctis." 5i lin. "Al- 

 lied to infundibuliformis." 



