178 KEY. K. T. Lowe's list or shells 



sulcata" instead of hicingulata, aud tlie habitat "la Nouvelle- 

 Hollande, M. MacLeay," Lamarck's diagnosis and description 

 (Hist. ed. 2. ix. 100) seem to denote this Mediterranean and 

 Canarian (Lanzarote, McAndr.) species; though Philippi's query 

 to this reference must be retained till the above discrepancies can 

 be accoTinted for. The smaller size and umbilicus distinguish at 

 once the species from S. hylridum (L.), Chemn. v. 132, t. 173. 

 f. 1702, 1703 ; though, from its Mediterranean habitat, as 

 Mr. Hanley suggests, it may very possibly have been the shell 

 primarily intended by Linnaeus (Syst. ed. 12. 1228) for his Tro- 

 clms hyhridus rather than that of the " Museum Ulricse." 



55. Trochus Eltonice, Lowe. 



T. testa parvula conica perforata laevi strigis lineolisve purpureo-fuscis 

 rubrisve obliquis eleganter picta, apice livido-cserulescente ; aiifractibus 

 planatis obsolete spiraliter costulatis v. sulcatis, ultimo ad carinam 

 subcingulato subtus planato ; striis earumque interstitiis Isevigatis ; 

 sutura simplice ; perforatione parva aperta distincta cylindrica ; aper- 

 tura depresso-rotundata ad basin columellse rectse subangulata. 



Diam. maj. 3-4 lin., min. 2|-3|; alt. 3-4. Anfr. 5-6. 



An T. variegatus, Chemn. v. 104. t. 171. f. 1661, 1662? 



Like T. exiguus, Pult., or a miniature T. zizipTiinus, L., but 

 with a distinct though small umbilicus. Shell very strong, simply 

 and exactly conical, as high as broad, very smooth and shining, 

 marbled or mottled with oblique wavy slaty-brown lines, or rose- 

 red streaks, uniting at the sutures into larger distinct equidistant 

 spots or patches on a yellowish-white ground ; the apex dusky- 

 livid. Volutions flat, with the suture simple, spirally ribbed or 

 grooved, the ribs and their interstices quite smooth and even, not 

 granulated or striated obliquely as in T. exiguus, Pult., or T. stri- 

 atus, L. ; the last volution entirely, and the others partially, some- 

 what indistinctly cingulate, or belted with a slightly raised, smooth, 

 tumid girdle at the lower angle. Base flat, with a small round 

 open perforation like a pin-hole. Aperture round, a little angular 

 only at the base of the straight oblique pillar. 



Except the synonym of Chemnitz (which is doubtful, no less 

 from the imperfection of his figiures and description than from the 

 habitat, " Cape of Grood Hope," attributed to his species), I can 

 find no notice or description at all applicable to this well-marked, 

 pretty little Troclms. It is therefore named to record the assi- 

 duity and liberality of a very zealous and discriminating shell- 

 collector (Mrs. Elton), the lady of the British Vice-consul at 

 Mogador, to whose kindness I am indebted for the acquisition of 



