MOLLUSC A. 29 



transparent, pinkish-yellow, with a row of semioval crimson spots round the thin free edge, 

 the remainder being covered with radiating linear spots and short waved lines of a crimson 

 colour ; siphon marbled with crimson ; foot of a delicate yellowish-pink, marked with deep 

 crimson rays. The shell is of a bright olive carnelian hue, conspicuously encircled at 

 irregular intervals with broad black lines, having almost the consistency of bands. 



2. Marginella undulata. PI. VII. Fig. 5 a, b, c. Deshayes, Anim. sans vert. vol. x. p. 451. 

 Yoluta glabella undulata, Gliemnitz, Conch. Cab. vol. s. pi. 150. f. 1423-4. Voluta strigata, DihVyn. 

 Marginella strigata, Kiener. 



Hab. East Coast of Africa ; from a sandy floor. 



This fine species was also taken alive. The tentacles, siphon, foot, and mantle are of a 

 delicate, semitransparent, yellowish ground colour, streaked and mottled with carmine, the 

 border of the mantle being richly spotted with the same. The left lobe of the mantle is 

 more produced over the shell than the right. 



The tentacles of the Marginellcs appear to vary in different species. In those observed 

 by M. Deshayes on the shores of the Mediterranean, the tentacles are described as being 

 short, whilst in this and the preceding species they are slender and elongated. It may be 

 remarked, too, that the eyes of the Marginella diadochus are more pedunculated than those 

 of M. undulata. 



3. Marginella onychina. PI. X. Pig. 25. Marg. testa ovata, subobesa, spira plano-depressa, fere 

 occulta, anfractibus superne rotundato-tunxidis, columella fortiter sexplicata, apertura elongata, labro incras- 

 sato ; albida, cinereo-grisea, confertim promiscue strigata, obscure trifasciata, labro albo. 



Hab. China Sea. 



This species might be readily confounded with the Marginella tricincta, but it differs 

 materially in form, being more depressed and rounded at the hinder extremity, with the 

 spire buried as in the Cowries, and less swollen in the middle. The streaky character of 

 the painting is also characteristic. 



3. PURPUR1TERA. 



The Parpurifera are most abundant in the Eastern Seas, and were collected in great 

 numbers ; but, as monographs of the principal genera have been only lately published, 

 little remained that was new. No Columbellm were taken but what have been already 

 figured in the ' Thesaurus Conchyliorum ;' it has, however, been thought desirable to figure 

 the living C.fvlgurans and semipunctata, the habits of which afforded some observations. Five 

 species of Terebra, differing from any of those described in Mr. Hinds' recent monograph of 

 that genus, were collected, and a magnificent addition was made to the limited genus 

 Oniscia. 



