MDREX. o 



paucis ; canali crassiusculo, elongato, anfractibus brevibus, ad 

 suturam subexcavatis ; aperfcura antice unidentata. — Of a 

 light pinky colour, with depressed whorls, which are hollowed 

 near the suture, where the tubercles end. Spines short on 

 the whorls, rather long on the upper part of the canal. 



6. rarispinosus, f. 2, Lamarck. — Testa griseo-fulva, spi- 

 noso-trivaricata, spiraliter lirata, inter varices trituberculata, 

 spiuis breviusculis, ad anfractus tribus, ad canalem tribus 

 brevibus ; apertura subovata dente marginali magno ; spira 

 producta anfractibus subangulatis. — I cannot possibly agree 

 that Lamarck could be thinking of any such shell as my 

 M. formosus when referring to the figure in Martini for his 

 rarispina. His description agrees better with this shell 

 than with any other. The spines are sometimes longer than 

 in our specimen. 



7. coronatits, f. 199, A. Adams. — Testa crassa fusca- 

 grisescens castaneo bifasciata, spiraliter lirata, inter varices 

 tuberculatim triplicata ; spinis paucis, ad angulum una pro- 

 minenti, infra una, ad canalem duabus. — The claim of this 

 little Japanese shell to specific distinction will be best under- 

 stood by seeing the figure or the specimen. Among the 

 long-channelled group it most nearly resembles M. rari- 

 spinosa. 



8. brevispinosus, f. 10, Lamarck. — Testa superne ven- 

 tricosa, subquadrata, sublsevigata, griseo-fulva, inter varices, 

 tuberculis senis, biseriatim dispositis munita ; varicibus bre- 

 viter quadrispinosis ; apertura oblonga, margine crenulato, 

 infra unidentato, canali unispinoso. — The body-whorl is 

 broad, and the interstices between the varices have four or 

 six tubercles in distinct rows. 



9. Macgillivrayi, f. 162, Morch. — Testa M. brevispince 

 similis, sed angustiora, spiraliter lirata. — Narrower in the 

 body-whorl than the preceding, and having a spirally ridged 

 surface. 



10. OCCA, f. 12, Sowerby. — Testa leviter spiraliter lirata, 

 inter varices quadrituberculata, glauco-fusca, anfractibus 

 brevispinosis, canali elongato, recto spinis senis gradatim 

 elongatis ; apertura oblonga, margine angulatim undato uni- 

 dentato. — This shell is known from M. rarispina by its 

 arrangement of distant tubercles between the varices and by 

 the more quadrate form of the body-whorl. 



