new Gastropoda from the Persian Gulf, &e. 309 
perleyes, ceteris apud suturas paullum gradatis, arcte longi- 
tudinaliter costatis, costis levissimis, albis, nitidis, interstitiis 
spiraliter sulculosis, nitentibus, undique hic illic stramineo vel 
ochraceo, preecipue juxta suturas et apud peripheriam maculatis 
et infra, depictis; apertura anguste oblonga, intus striata, 
ochracea, labro tenui, paullum effuso; columella quadriplicata. 
Long. 13, lat. 4°25 mm. 
Hab. 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 macula- 
tions 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 longi- 
tudinal coste in our species on the body-whorl is from 
26 to 28. 
Marginella (Glabella) alchymista*, sp. n. 
(PISO, fies l3:) 
M. testa parva, fusiformi, nitidissima, subdiaphana, delicata; an- 
fractibus quinque, lvissimis, apud suturas paullum impressis; 
apertura oblonga, labro nitido, incrassato, intus supra conspicue 
unidentato, superficie omni dorsaliter levi; columella quadri- 
plicata. 
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. 
A very pretty, shining Gabedla, its spire more elongate 
than fustformis, Hinds, with which it has been hitherto 
confounded, and as which it is inserted in our Catalogue f, 
It is comparable with J/. alta, Wats. (Challenger? Expe- 
dition), from Cape York, N.E. Australia. 
* Alchymista, an alchemist. 
+ Proc. Zool. Soc. 1901, vol. ii. p. 425, 
