D I N E . 



Plate YI. 



Species 20. (Fig. u, b, c, !Mus. Cuming.) 



DioxE SEMILAJIELLOSA. BioH. U'stu Huhlr'ujono-ovatd, 

 ventricosiuscidd, nlbd, piirpiireo-violaceo plus minus 

 tinc.ld, coucentnce cori'u/jalo-liratd, liris ad latits mi- 

 ticuni lameUutis, per iiiart/inem postlcuvi hie iltic 

 loiiffissiiue spinosis, spiuis interdum biserialibus. 



The half-lamellated Dione. Shell somewhat trian- 

 guhirly ovate, rather ventricose, white, more or less 

 tinged with purple-violet, concentrically wrinkle- 

 ridged, ridges lamellated on the anterior side, here 

 and there very long-spined along the posterior mar- 

 gin, spines sometimes in two rows. 



Ci/therea lamellosa, Gaudichaud ; Belessert, Eecq. de Coq. 

 pi. 10. f. 3. 



Cijtherea lupanaria. Lesson. 

 Venus lupanaria, D'Orbigny. 

 Bioue lupanaria, Deshayes. 



llab. Central America. 



For reasons which are obvious I think it better to 

 abandon the foul name given to this lovely species by 

 Lesson. 



Species 21. (Mus. Cuming.) 



Dione brevispixata. Biun. testa suljlriijono-ovatd, ven- 

 tricosiusculd, alba, concentrice erecto-lirald, liris ad 

 laius aniicum lamellaiis, per maryinem posiicum brevi- 

 spinatis. 



Tub short-spined Dione. Shell somewhat triangularly 

 ovate, rather ventricose, white, concentrically erectly 

 ridgetl, ridges lamellated on the anterior side, short- 

 spined along the posterior margin. 



CylUerea brevispina, Sowcrby, Thes. Couch, p. 632.pl. 132. 

 f. 109. 



Ilab. California. 



No actual spines are developed on the posterior margin 

 of this species. 



Species 22. (Mus. Cuming.) 



Dione MULTISPINOS.a. Bion. testd subtrigono-ovatd, ven- 

 tricosiusculd, alba, 2Jvrpurascente-violaceo interdum, 

 pallida tincld, concentrice lamellato-liratd, liris ad 

 latus anticum lamellatioribus, latere postico spiuis 

 tenuibus copiose biseriutim munito. 



The many-spined Dione. Shell somewhat triangularly 

 ovate, rather ventricose, white, sometimes faintly 

 tinged with purple-\'iolet, concentrically lamellately 



ridged, ridges more lamellate on the anterior side, 



posterior furnished with a double row of numerous 



slender spines. 

 Cijiherea mullispinosa, Sowcrby, Thes. Conch, p. 632. 



pi. 132. f. 112. 

 Hab. Feru. 



A small form of this peculiar type, in which the con- 

 centric ritlges are more thinly lamellate, and the spines 

 more slender and numerous. 



Species 23. (Mus. Cuming.) 



Dione Veneris. Bion. testd subtrigono-ovatd, venlri- 

 cosiusculd, alhd, purpurascente-violaceo plus minus 

 tlnctd, concentrice lameltato-lii-atd, liris ad latus an- 

 ticum lamellatioribus, per maryinem posticum modice 

 spinalis. 



Venus's I)ione. Shell somewhat triangularly ovate, 

 rather ventricose, white, more or less tinged with 

 purple-violet, concentrically lamellately ridgetl. ridges 

 more lamellate ou the anterior side, moderately 

 spined along the posterior margin. 



Concha Veneris, D'Argenville, Conch, pi. 21. f. I. 

 Venus Bione, Linnanis. 

 Cytherea Dione, Lamarck. 

 Dione Veneris, Deshayes. 



Hab. West Indies and Central Aujcrica. 



The concentric sculpture in this form of the group is 



not obtusely wrinkled, as iwB. semilamellosa , but erect and 



lamellate throughout ; and the spines are only moderately 



developed. 



Species 24. (Mus. Cuming.) 



Dione exspinata. Bion. testa subtrigono-ovatd, ventri- 

 cosiusculd, alba, purpurascente-violaceo plus minus 

 tinctd, concentrice corrugato-liratd, liris ad latus an- 

 ticum, lamellatis, per margiuem posticum muricato- 

 tuberculalis. 



The spineless Dione. Shell somewhat triangularly 

 ovate, rather ventricose, fl'hite, more or less tinged 

 with purple-violet, concentrically wrinkle-ridged, 

 ridges lamellate on the anterior side, prickly tubercled 

 along the posterior maj'giu. 



Ilab. Central America. 



If the other alleged species of this Plate are distinct 

 from one another, so also is this. Excepting that the spines 

 are wanting, it comes nearest to B. semilamellosa. 



August, 1863. 



