FISSURELLA. 



Pla 



15. (Mus. Cuming.) 



FissuRELLA Natalensis. Fiss. testa oUongo-ovata, an- 

 tice aitemiatd, subcompressd, radiathn costatd, costls 

 ituequalibm, auhohsolete nodosis, orificio oblongo, sub- 

 angnslo, lateribus medio paululum excavatu ; albidd, 

 radiis vi.oluceo-n/ffricantibus pictd. 



The Natal Fissurella. Shell oblong-ovate, attenuated 

 anteriorly, rather compressed, radiately ribbed, ribs 

 uneven and rugged, somewhat obsoletely nodose, 

 orifice oblong, rather narrow, sides a little excavated 

 in the middle ; whitish, painted with violet-black 

 rays. 



Krauss, Sudafrick. Moll. p. 60. pi. 4. i'. 8. 



Hab. Port Natal, South Africa. 



The concentric lines of growth have very mucli the 



appearance, here and there, of festooned ridges. The 



species is frequently of a rather darker greyish or greenish 



hue than the specimen here represented. 



Species 16. (Mus. Cuming.) 

 FissuRELLA Bkidgesii. Fiss. testd ovaid, antice sub- 

 atleimatd, crassiusculd, depressd, concentrice subt'dis- 

 sime striata, orificio oblongo, latiicsculo, lateribus me- 

 dio excavatis ; fmco-purpiireo et cinereo-nigricante con- 

 centrice fasciutd, obscure albiradiatd, margine basali 

 latissimo, purpurea. 

 Bridges' Pissurella. Shell ovate, slightly attenuated 

 anteriorly, rather thick, depressed, concentrically 

 very finely striated, orifice oblong, rather wide, sides 

 excavated in the middle ; concentrically banded with 

 brownish purple and ashy black, obsem-ely white- 

 rayed, basal margin very broad, purple. 

 Hab. Quintero, Chili (on the rocks) ; Bridges. 



This fine species approaches the F. latimarginata in 

 general aspect, but will be found to difi'er materially on 

 comparison. It is of thicker growth, not radiately striated, 

 the orifice diifers in being larger and excavated at the 

 sides, and the painting is of a lighter purple-ash. 



Species 17. (Mus. Cuming.) 

 FissuRELLA CUMINGII. Fiss. testd ovatd, antice atlenuatd, 

 depressd, radiatim costatd, costis obtusis, incequalibus, 

 obscure squamato-iiodosis ; purpurascente-cinered etfer- 



III. 



rugined, intense purpurea radiatd, circa orificium alba, 

 obscure sparshn, punctata, margine basali latissimo, 

 fulvo-cinerascente, purpurea maculatd. 

 Cuming',s Pissurella. Shell ovate, attenuated an- 

 teriorly, depressed, radiately ribbed, ribs obtuse, 

 unequal, obscurely squamately nodose ; purple-ash 

 or rust-colour, rayed with deep purple, white around 

 the orifice, sprinkled with a few obsem'e dots, basal 

 margin veiy broad, fulvous ash, blotched with purple. 

 Hah. Quintero, ChUi; Bridges. 



Another interesting new species, collected by Mr. 

 Bridges in the same locality with the preceding, in which 

 the coloured margin of the base is as broad as in the 

 F. latimarginata. I have the pleasure of naming it after 

 Mr. Cuming in honour of his productive researches in 

 this genus along the Western Const of South America, 

 which have been so successfully followed up by Mr. 

 Brido-es. 



Species 18. (Mus. Cuming.) 



Pissurella crenulata. Fiss. testd oblongo-ovatd, sub- 

 irregulari, depresso-convexd, radiatim subtiliter et cre- 

 berrinie liratd, liris transversim sttbtilissinie obsolete 

 squamato-striatis, orificio amplo, subordiculari, margine 

 basali crenulato ; rosaceo-fulvd. 



The crenulated Pissurella. Shell oblong-ovate, 

 somewhat irregular, deeply convex, radiately finely 

 and very closely ridged, ridges transversely very finely 

 striated with obsolete scales, orifice large, nearly 

 orbicular, basal margin crenulated ; pinkish fulvous- 

 colour. 



SowEKBY, TankerviUe Catalogue, App. p. vi. 



Hab. Monterey, Upper California. 



This remarkable species stands alone, no other having 



been (bscovered with which it would profit to constitute 



any comparison. 



Species 19. (Mus. Cuming.) 



Pissurella latimarginata. Fiss. testd ovatd, antice 

 attenuatd, depressd, medio elevatiusculd, radiatim multi- 

 striatd, orificio oblongo-ooato ; intense purpureo-hrunneo, 

 margine basali latissimo, purpureo-brunneo. 



The wide-edged Pissurella. Shell ovate, attenuated 



