MITKA.— riATE XXVII. 



at the upper part, smooth ; livid green, encircled with 

 brown regular lines, sometimes impressed, the inter- 

 stices between which are flaked with snow-white spots ; 

 columella five- or six-plaited ; aperture very long. 

 Deshayes, Anim. sans vert. vol. x. p. 355. 

 Imbricaria conica, Schumacher. 

 Conohelix marmorata, Swainson. 

 Mitra marmorata, Schubert and Wagner. 

 Hub. Philippine and Society Islands (found among coral 

 sand on the reefs) ; Cuming. 

 Schumacher's specific name should certainly be main- 

 tained for tliis species, after the example of M. Deshayes. 

 Swainson's Conolieli.r lincalas, figured in the Zoological 

 Illustrations, 1st Series, is probably nothing more than a 

 pale discoloured example of his Conohelix marmorata. 



Species 217. (Mus. Belcher) 

 Mitra carbonacea. Mitr. testa eumed, superne rotnn- 



datd, spird brevi, a/pice elato, acuminate; laevigata, po- 



litd,prope basin obsolete sulcata ; nigerrimd; columella 



quinqueplicatd ; aperturd longmimd. 

 The carbonaceous Mitee. Shell conical, rounded at 



the upper part, spire short, apex raised, acuminated; 



smooth, polished, obsoletely grooved near the base ; 



very black ; columella five-plaited ; aperture very 



long. 



Imbricaria carbonacea. Hinds, Zoology of the Voyage 



of the Sulphur, Mollusca, p. 41. pi. xi. f. 9 and 10. 



Hab. L'Agulhas Bank, Cape of Good Hope (dredged from 



deep water on a gravelly floor) ; Hinds. 

 A bright jet black ebony-like shell. 



Species 21S. (Mus. Norris.) 



MlTRA FILUM. Mitr. tenia e>/!in<lraeei)-otil<mip'i, Olicnformi, 

 liiriijatd, polifd, sjiird breri, mm-rouatd, puuctitratd ; 

 eburned, anfractu ultimo fascia olivaceo-fuscd, filisalhis 

 tennissimis Jle.vnosis lonijilialinatiler slrigatd, propc 

 basin cincto ; columella quinqueplicatd; apice basique 

 nigricante-violaceis. 



'I'm e thread-marked Mitre. Shell cylindrical!}- oblong, 

 Olive-shaped, smooth, polished, spire short, pointed, 

 punctured ; ivory white, last whorl encircled near the 

 base with a broad olive-brown band, streaked longi- 

 tudinally with fine white flexuous thread-like lines ; 

 columella live-plaited, apex and base of the shell tipped 

 witli blackish violet. 

 / ohtafilum, Wood, Ind. Test. Supp. pi. 3. f. 30. 



Ilab. Zanzibar, East Coast of Africa ; Thorn. 

 MM. Deshayes and Kiener have described and figured 



tins shell as the Mitra bicolor of Swaiuson, which is merelj 



:i very young specimen of the Mitra casta. Mr. Swainson's 



figure, in the Zoological Blustrations, represents a white 

 shell with a band of brown epidermis, and of fusiform struc- 

 ture, with a regular acuminated spire. The shell under 

 consideration, is of the true Oliva form, tipped with blackish 

 violet, the spire being comparatively very small ; the co- 

 loured band is not merely a band of epidermis, but of coloured 

 enamel ; and it is remarkably well characterized by a pro- 

 fusion of fine white thread-like lines miming down in a lon- 

 gitudinal direction, of which no mention is made by Mr. 

 Swainson in describing his Mitra bicolor. " Elle est ornee," 

 says Deshayes, "dune large zone d'un beau brun, sur 

 laquelle on remarque a l'aide de la loupe un grand nombre 

 de petites lineoles blanchatres." 



Species 219. (Mus. Cuming.) 

 Mitra ossea. Mitr. testa conicd, superne rotundatd, spird 

 brevissimd, apice minuto, elato ; laevigata, undique se- 

 riatim pa aetata; albkld, aut jlacicante ; columella sex- 



plicatd, 



The bone Mitre. Shell conical, rounded at the upper 



part, spire very short, apex minute, elevated; smooth. 



encircled throughout with rows of punctures; whitish 



or yellowish; columella six-plaited. 



Conohelix punctatus, Swainson, Zool. Mus., 1st Series. 



Mitra punctata, Deshayes (not of Swainson). 

 Mali. Society Islands (found under coral on the reefs at 



low water); Cuming. 

 The entire surface of this shell, which has very much the 

 appearance of a piece of polished bone or ivory, is encircled 

 with rows of small punctures. It is perfectly distinct from 

 the Mitra Vanikorends, of which M. Kiener presumes to 

 assert that it is a young discoloured example, and is well 

 distinguished by M. Deshayes. 



Species 220. (Mus. Norris.) 

 Mitra Vanikorensis. Mitr. testa conicd, last subn curvd, 

 spird breri, apice mucronato ; lavigatd, striis tenuis- 



si me pnnelatis aniliqiie eiinjiilalti , cinereo-ercriilescen/e, 



superne albizonatd, maculis minutis numerosis albis cas- 

 taneo-marginatis ornatd; columella sexpli 

 turd longissimd. 

 The Vanikoro Mitre. Shell conical, base a little re- 

 curved, spire short, apex pointed; smooth, encircled 

 throughout with very finely punctured stri;e; ash_\ 

 blue, ornamented with numerous minute white spots 

 edged with ehesnut ; columella six-plaited; aperture 



very long. 

 Quoy, Voy. de I' Astrolabe, Zool. pi. 15 bis. f. 5 and 6. 

 Ilab. Island of Vanikoro, New Zealand ; Quoy. 



An extremely pretty species, first collected by the inde- 

 fatigable naturalists of the A-trolalv. 



