169 



The exquisite dellcacy and beauty of this shell is remarkable ; each 

 rib is surmounted with a close-set ro\v of slender scale-like spines, 

 and the interstices are minutely cancellated ; they are raoreover 

 tinged with pink, and down each side of the ribs is a bright scarlet 

 line. 



There is another very beautiful small specimen of the Cardium 

 hystrix in the collection of Miss Saul ; and Mr. Cuming is also in 

 possession of two of the white variety. 



Cardium rubicundum. Card, testd oblongo-ovatd, vix obligud, 

 radiatim costatd, costis acute convexis, septem et triginta, quarum 

 anticd sguamoso-crenatd, mediand utrinąue obtuso-squamatd,posticd 

 tuberculatd ; rubicundd, umhones versus albicante rubido-fusco tna- 

 culatd ; marginibus intus vivide rubris. 



Conch. Icon., Cardium, pi. 9. f. 44. 



Hab. Zanzibar, east coast of Africa. 



An extremely pretty species, remarkable for its vivid colouring 

 and for the elaborate character of its sculpture. 



Cardium assimile. Card. testd oblongo-ovatd, obliqui radiatim 

 costatd, costis quinque et triginta, basi latis, approximatis, summi- 

 tatem versus attenuatis, anticis crenatis, postremis tuberculatis, 

 medianis leevibus, lateraliter subtilissime impresso-serratis ; pallide 

 purpureo-rufescente, umbones versus albicante, maculis sparsis 

 variegatd. 



Conch. Icon., Cardium, pi. 9. f. 45. 



Hab. Zanzibar, east coast of Africa. 



This species approximates very closely to the Cardium subelonga- 

 tum, yet there are difFerences which cannot be overlooked ; it has a 

 greater number of ribs and the ribs are of another structure. 



Mitra. 



• Mitra Norrisii. Mitr. testd elongato-ovatd, crassd, solidd, spird 

 subobtuso-acuminatd ; striis transversis et longitudinalibus.elevatis, 

 confertis, undique subtilissime reticulatd aut clathratd, transversis 

 prominentioribus ; eburned, epidermide corned, tenui, nigerrimd; 

 columelld sexplicatd. 

 Conch. Icon., Mitra, pi. 1. f. 6. 



Hab. ? 



I have much pleasure in dedicating this fine species, so entirely 

 distinct frora any hitherto described, to Thomas Norris, Esq., a 

 worthy and esteemed patron of the natūrai sciences, whose magnifi- 

 cent collection of Mitrės has so greatly contributed to the complete- 

 ness of my monograph in the work above referred to. It is impos- 

 sible to convey an adequate idea of the finely reticulated sculpture 

 of this unique shell by a lithographed figure, it being so fine that 

 the interstices of the net-work resemble minute punctures. 



Mitra Dennisoni. Mitr. testd fusiformi, spird attenuato-acumi- 

 natd, anfractibus subconcentrici costatis, transversim sulcatis. 



