DESCRIPTIONS OF SIXTY-EIGHT NEW SHELLS. 221 



punicea vel carnea, labro intus denticulato, margine columellari paullum 

 reflexo ; columella quadriplicata, canali brevi, recurvo. 

 Alt. 13, lat. 9 mm. 



Hab. Persian Gulf, Gulf of Oman, near Maskat, 10 fathoms. 

 A somewhat solid, small, but well-grown Peristemia unlike any species 

 known to us, being superficially similar to a Coralliophila ; indeed, as suggested 

 by the specific name, we should imagine it would be found ultimately inhabiting 

 corals. The surface is chalky-ash, longitudinally rudely ribbed, crossed by 

 equally coarse spirals ; mouth pale pink, ovate, outer lip thickened, seven- 

 denticled within, columella four-plaited. 



MITRA {COSTELLARIA) DIACONALIS*, sp. n. (PI. C. fig. 12.) 

 M. testa fusiformi, solidula, albo-straminea, apicem versus attenuata ; anfrac- 

 tibus 12, quorum apicalestres fusco-hyalini, perlseves, casteris apud suturas 

 paullum gradatis, arete longitudinaliter costatis, costis lasvissimis, albis, 

 nitidis, interstitiis spiraliter sulculosis, nitentibus, undique hie illic stramineo 

 vel ochraceo, prascipue juxta suturas et apud peripheriam maculatis et infra, 

 depictis ; apertura anguste oblonga, intus striata, ochracea, labro tenuir 

 paullum effuso ; columella quadriplicata. 

 Long. 13, lat. 4-25 mm. 



Hah. Persian Gulf, Sheikh Shuaib Island, at 15 fathoms, among coral-sand. 

 A Costellaria allied to M. scitula, Ad. } which, however, possesses the whorls 

 more scalate and with darker maculations and shading ; it is, moreover, a 

 smaller species. To M. impressa, Reeve, known to us only by a figure, there 

 is a resemblance : this shell, however, is of a uniform dark hue, and the ribs 

 seem more incrassate. The number of longitudinal costse in our species on the 

 body-whorl is from 26 to 28. 



MARGINELLA {GLABELLA) ALCHYMISTA\, sp. n. 

 (PI. C. fig. 13.) 

 M. testa parva, fusiformi, nitidissima, subdiaphana, delicata ; anfractibus 

 quinque, lasvissimis, apud suturas paullum impressis ; apertura oblonga, labro 

 nitido, incrassato, intus supra conspicue unidentato, superficie omni dorsalite 

 laevi ; columella quadriplicata. 



Var. A. CHRYSALCHYMA, nov. 

 Testa aureo-straminea, dorsaliter, cum labro, omnino rufo-suffusa, vel spiraliter 



bizonata. 

 Long. 5, lat. 2'50 mm. 



Hab. Persian Gulf, Gulf of Oman, Maskat, 10 — 15 fathoms. 

 Var. B. LEUCALCHYMA, nov. 

 Testa major, omnino Candida, immaculata ; labrum candidum, nitens. 

 Long. 6, lat. 3 (sp. maj.). 



Hab. Persian Gulf, Gulf of Oman, Maskat, 10 — 15 fathoms; also at 156 

 fathoms, lat. 24° 58' N., long. 56° 54' E., and at 205 fathoms, lat. 24° 5' N., 

 long. 57° 55' E. 



* Diaconus, a deacon. 



t Alchymista, an alchemist. 



