179 



Mitra solidula and anthracina ; each species may, however, be fully 

 distinguisbed by its difFerence of form and other minor peculiari- 

 ties. 



Mitra anthracina. Mitr. testd acuminato-ovatd, spird acutd, 

 glaberrimd; anthracind; columelld subconcavd, guadriplicatd, cal- 

 lositate parvd, superne armatd ; labro peculiariter planulato, su- 

 peme leviter canaliculato, intus crenulato. 

 Concb. Icon., Mitra, pi. 18. f. 137. 



Hab. Island of Ticao, Pbilippines (found on the reefs at Iow water) ; 

 Cuming. 



Very closely allied to the Mitra solidula, but of a more elongated 

 form, with a smooth shining surface. 



Mitra robusta. Mitr. testd ovatd, crassd, spird brevi, subobtusd; 

 anfractibus tumidiusculis, transversim sulcatis, basin versus pree- 

 cipue, longitudinaliter concentrice plicato-rugosis ; rubido-fuscd ; 

 columelld concavd, guadriplicatd, callositate armatd ; labro incras- 

 sato, planulato, superne canaliculato, intus crenulato. 



Conch. Icon., Mitra, pi. 18. f. 140. 



Hab. ? 



This species partakes of the characters of the Mitra Woldemarn 

 and Ziervogeliana in about equal proportions. 



Mitra pulchella. Mitr. testd acuminato-ovatd, spird subturritd, 

 longitudinaliter costellatd, costellis angustis, planis, confertiusculis, 

 basin versus subgranosis, transversim impresso-striatis ; aurantio- 

 lutescente, fascid purpurascente inter costas ornatd; columelld 

 quinqueplicatd. 



Conch. Icon., Mitra, pi. 19. f. 142. 



Hab. Island of Barbadoes, West Indies ; Humphreys. 



The painting of this shell has a very pretty appearance. 



Mitra histrio. Mitr. testd subovatd, spird breviusculd, longitu- 

 dinaliter costatd, costis subobtusis, basin versus granulosis, inter- 

 stitiis transversim striatis ; vivide coccined, suturis nigris, nigro 

 interdum nebulosd, balteo albo angusto, balteocue nigro, cingulatd ; 

 columelld guadriplicatd. 



Conch. Icon., Mitra, pi. 19. f. 144. 



Hab. ? 



A gaily- coloured scariet shell more or less banded and bedaubed 

 Vfith. black. 



Mitra rtjbritincta. Mitr. testd oblongo-ovatd, crassiusculd, acufb 

 acuminatd, transversim undigue sulcatd; albd, maculis grandibus 

 aurantio-rubris supra infrague seriatim nebuloso-tinctd ; columelld 

 guadriplicatd; labro crenulato. 



Conch. Icon., Mitra, pi. 19. f. 147. 



Hab. Island of Ticao, Pbilippines (found under stones at low 

 vater) ; Cuming. 



The surface of this shell is characteristically grooved throughout. 



