forming a strong flexuous pliciform tooth at the upper end, thickened on the outer edge, depressed near the base, and forming a 

 tooth-like fold at the lowest end : both the canals very short. The outer lip of the only specimen I have seen is rather sharp, and 

 a few of the teeth extend from the inner to the outer edge, near the centre of the lip. I am not acquainted with its locality. 



OVULUM VERRUCOSUM. Fig. 10 to 12. 



O. testa ovatd, gibbosA, albd ; dorso transversim angulato ; verrucd depressd ad utramque extremitatem adjectd ; long. l r \, lat. 

 T \, poll. 



Ovula verrucosa, Lam., Anim. sans vert. VII., 367. Bulla verrucosa, nonnull. 



Testa junior marginem labii externe interne edentulum exhibet. 



Hab. in Oceano Indico. 



Desc. Shell ovate, gibbose, white, pale lilac at the extremities ; the back raised into an obtuse transverse angle ; outer lip 

 when full grown much thickened, toothed on its inner edge ; the glaze spread over the outer part of the shell at its maturity does 

 not meet in the middle of the back, the intermediate space is faintly transversely striated : two singular small flattened, white, 

 brown-edged, wart-sbaped excrescences, one placed at each extremity of the back, distinguish this species from all others. 



Not an uncommon species in the Indian Ocean, the Ceylon and Isle of France boxes generally containing several specimens. 

 It is, however, rendered interesting, as being the only shell with the singular tubercular appendages noticed in its character and 

 description. To these it is indebted for its name, and on acconnt of them Montfort distinguished it from Ovulum as a genus under 

 the name of Calpurnus. 



OVULUM ANGULOSUM. Fig. G to 9. 

 O. testa ovato-ventricosd, albd; dorsi medio transversim obtuse angulato, lineis suhprominulis cincto ; intus roseo-violaced ; 

 long. 2, lat. 1 T %, poll. 



Ovula angulosa, Lam., Anim. sans vert. VII., 367. Bulla imperialis. Dillw. 



Ovula costellata. Lam., Ann. du Mus. XVI., 1 1 0. 



Hab. " Friendly Islands." G. Humphrey. 



Desc. Shell ovate, ventricose, milk-white ; the middle of the back transversely obtusely angular, with a few raised lines ; 

 the upper extremity is not produced into a regular canal as in O. Ovum, but the lower canal is rather lengthened and truncated ; 

 outer lip much thickened, crenulated on its inner edge : inside of a delicate rose-colour. 



I possess a dwarf variety of this beautiful species, which is of a dirty brownish white on the back. It is observable that 

 Lamarck has very arbitrarily, and without giving any reason, changed the specific name from costellata to angulosa ; I cannot help 

 regretting this circumstance ; at the same time I adopt the latter name as being the more expressive.* He states that this species 

 is always smaller than 0. Ovum, I have, however, some specimens of the latter that are fully grown, and yet smaller than the 

 smallest I have seen of O. angulosum. This is a very rare species, and deservedly esteemed by collectors. 



* For the sake of avoiding an useless synonymy, it would have been desirable to have retained Dillwyn's specific name of imperialis. 

 Lamarck has, however, in this instance, as in many others, been guilty of a great oversight, in describing as new a shell that had been 

 described long before. 



OVULUM TRITICEUM. Fig. 35. 

 Lam., Anim. sans vert. VII., 368. 

 O. testd ovato-oblongd, lari, rubro-auranliacd ; labio externa albicante, intus minulissime deutieulato ; columella superne dente 

 albida, valido, subtils compressd ; long. iA, lat. ^, poll. 



Hab. . Mus. nost. 



Desc. Shell ovato-oblong, smooth, orange-red ; outer lip whitish, rather straight edged, slender, sloping from the outer 

 to the inner edge, which is very minutely denticulated ; there is a tubercular fold or strong whitish tooth at the upper end of the 

 columella, the base of which is depressed and straightened : aperture narrow at the upper extremity, wider and somewhat angular 

 at the lower. In general form this species is more lengthened than O. carneum, and it is less gibbous ; it has, however, a slight 

 angular gibbosity rather above the middle of the back. My specimens accord perfectly with Lamarck's description ; he states that 

 it is found on the coast of Africa ; my specimens, according to the late G. Humphrey, are from Japan. 



