FISSURELLA. 



Plate VII. 



Species 43. (Fig. a and h, Miis. Cuming.) 



FissURELLA MUTABiLis. Yisn. testd ovald, anfici^ sid- 

 aiienuatd, medio elcvatd, laUribus subcompressd, ra- 

 diatim mpresso-striatis, siriis concentrieis demssatd, 

 orificio ohlongo-ovato ; cinered ant virescente, interdicui 

 roseo-radialdy radid miicd aUncanle phm minus obscurd 

 utringne notatd. 



The changeable FisstiB,ELi,A. Shell ovate, somewhat 

 attenuated anteriorly, elevated in the middle, a little 

 compressed at the sides, radiately inipressly striated, 

 crossed with concentric strife, orifice oblong-ovate ; 

 ash-colour or greenish, sometimes rayed with pink, 

 and marked on both sides with a more or less obscure 

 whitish ray. 



SowERBY, Pro. Zool. Soc, 1831., p. 120; Conch, lllus. 

 f. 07, 70. 



Hah. Cape of Good Hope. 



Of rather compressed growth, variously coloured, but 

 mostly characterized by a white ray on cither side of the 

 orifice. 



Species 44. (Mus. Cuming.) 



FiSSURELLA MICROTEEMA. i^M.S. tedd ornlil, ini/in- sit/j- 

 atleiuiatd, depressiiiscidd, riiyosd, radialiui liiui'iliroid, 

 liris nonmdVm suhproiniiicntibiis, orijiciu iii'niiilo ; fiiacd, 

 maculis perpaucis albidis aspersd, liris purpiireo-riifis, 

 circa orificium nigricante-viridi, intus vh-esccnte. 



The SMALL SLIT Fissurella. ShcU ovate, somewhat 

 attenuated anteriorly, rather depressed, rough, radi- 

 ately thinly ridged, some of the ridges rather promi- 

 nent, orifice minute ; brown, sprinkled with a very 

 few whitish spots, ridges purple- red, dark green 

 around the orifice, interior gi-eenish. 



SowERBY, Pro. Zool. Soc, 1834, p. 13.5 ; Conch. lUus. 

 f 50. 



Hab. Real Llcjos, Central America (under stones at low 

 water) ; Cuming. 

 This species has little character to distinguish it beyond 



the smallness of the orifice. 



Species 45. (Mus. Cuming.) 

 Fissurella Jukesii. Fiss. testd subquadrato-ovatd, an- 

 tice inclinatd, costis Urisqtie piilclicrriiid; sqiiamatis 

 radiald, iiiicrstiliis profundis, eximie rlaflirntis, ori- 



ficio parvo, quadrato-ovato, margine basali bidentato ; 

 albicanie, snbpellucidd, intus circa orificvuni nigricante- 

 viridi. 

 Jukes' Fissurella. Shell somewhat squarely ovate, 

 inclined anteriorly, ribs and ridges very beautifully 

 squamate, radiated, interstices deep, and delicately 

 latticed, orifice small, squarely ovate, basal maro-iu 

 bidentate; whitish, somewhat transparent, very dark 

 gTcen around the orifice in the interior. 

 Hab. Coast of Australia. 



The most beautifully sculptured shell I remember having 

 seen, rayed with numerous ribs and ridges, surmounted 

 with thickly-set vaulted scales, and so deeply carved in 

 the interstices that the ground surface is quite thin and 

 transparent. 



Species 40. (JIus. Cuming.) 



Fissurella obscuea. Fiss. testa ovatd, medio depressi- 

 usculd, radiatim eostatd et striatd, costis latis, obtusis, 

 distantibus, subcomgatis, orificio oblongo, lateribus 

 suhcontracto ; purjiiinv-nifrfirente, costis pallide viri- 

 dibus, circa <jrijinih,i niijn) lim-tis, intus virescente. 



The obscuee Fissuki.li.a. Shdl ovate, slightly depressed 

 in the middle, radiately ribbed and striated, ribs 

 broad, obtuse, distant, somewhat corrugated, orifice 

 oblong, a little contracted at the sides ; purplish-red, 

 ribs light green, stained with black around the ori- 

 fice, interior greenish. 



SowERBY, Pro. Zool. Soc, 1834; Conch. lllus. f. 37. 



Hab. Gallapagos Islands (under stones at low water) : 

 Cuming. 



The ribs of this species are rather superficial, being 

 little raised above the surface ; they are rather distant 

 from each other and have a swollen straggling ap]iearance. 



Species 47. (Mus. Cuming.) 

 Fissurella edititia. Fiss.'testd ovatd, atitici subat- 



tniiuild, nnlialnii. eoslald, n,sli, fnrlihiis, irregidarihus, 

 hrcrixiitiiiuiiilin, nrijirio jiiii-niiscii/o, riiltiiidaio-oratd ; 

 pinj)iirusi-i:iili:-njsrd el iiUid , iiiliis rirrxi't'iile. 



The selected Fissurella. Shell ovate, somewhat 

 attenuated anteriorly, radiately ribbed, ribs strong, 

 ii-regular, shortly scaled, orifice rather small, rotun- 

 dately ovate ; purple-rose and white, interior greenish. 



December, 1849. 



