FISSURELLA. 



Species 53. (Fig. a and i, Mus. Cuming.) 



FissuRELLA rusTULA. Fiss. tesld rotaiidato-elUpilcd, 

 plano-depressd, aiiiice subtruncatd, radiatim obtuse 

 codellatd, coslelUs strik concentncis elevaiiuscnlis 

 deciissads ; orijicio subanUco, oblongo, migusto, latcri- 

 bim medio excavath ; pallidi strandned, circa orificium 

 rosed, interdtmi roseo radiald. 



The pustule Fissukella. Shell rotundately elliptic, 

 flatly depressed, slightly truncated anteriorly, ra- 

 diately obtusely ribbed, ribs decussated with slightly 

 raised concentric stria3 ; orifice somewhat anterior, 

 oblong, narrow, sides excavated in the middle ; pale 

 straw-colour, pink round the orifice, sometimes rayed 

 with pink. 



Lajiarck, Anim. sans vert. (Deshayes' edit.) vol. vii. p. 597. 

 Patella pvstula, Linnaeus. 



Hab. West Indies ; Gosse. 



A peculiarly broad depressed species, faintly ribljcd and 



very delicately coloured. 



Species 53. (Mus. Cuming.) 



FiSSURELLA OBTUSA. Fiss. tc'std Ovatd, idri/io f/rratii/.s- 

 ciild, radiatim corrugato-costatis, co.-itit irrriinluriliiis, 

 iiitersHtiis snhimpresais, aperturd parciiixriihi, uhlnnyu, 

 lateribus subexcavatis ; rosaceo et albo radiatd, radiia 

 albis august is, couspicuis, radiis rosaceis la/ioril/iis, 

 prope basin vircsceidibus. 



The obtuse Fissurella. Shell ovate, rather elevated in 

 the middle, radiately ribbed in a somewhat wrinkled 

 manner, ribs irregular, interstices slightly impressed, 

 aperture rather small, oblong, with tlie sides exca- 

 vated ; rayed with pink and white, white rays narrow, 

 conspicuous, pink rays bro.ulcr, fading into light 

 green near the margin. 



SowERBY, Conch. lUus. Cat. Fiss. p. 7. f. 59. 



Hab. Cape of Good Hope ; Humphrey. 



The pink colouring which forms the radiating bands of 



this species, appears only in the grooves of the sculpture, 



and has the appearance of fine lines. 



Species 51'. (Mus. Cuming.) 

 Fissurella Ruppellii. Fiss. testa oeatd, medio valdi/ 

 elevatd, aiitici incUnald, radiatim costatd, costis ro- 

 Decemb 



Umdalis, allernatim majoribus, interstitiis peculiariler 

 et compicue clathratis, ori/icio parvo, autico, quadrato- 

 oblongo ; fuscescente-rufd, versus orijicimn alhd, radiis 

 ad octo intense nigris ornatd. 



Ruppell's Fissurella. Shell ovate, ranch raised in the 

 middle and inclined anteriorly, radiately ribbed, ribs 

 rounded, alternately larger, interstices peculiarly and 

 conspicuously latticed, orifice small, anterior, squarely 

 oblong ; brownish red, white towards the orifice, 

 ornamented with aliout eight intensely black rays. 



SoAVERBV, Pro. Zool. Soc. 1831-, p. 138. 



Ilab. Red Sea; RupiTell. 



A very elaborately sculptured and characteristic species. 



Species 55. (Mus. Cuming.) 



Fissurella ^EaUALis. Fiss. testd oblongo-ovaid, lenui- 

 culd, depressd, striis concentrieis et radiaulibiis, obtusis, 

 distantibiis, decussatd, orijicio ovato, subamplo ; cinereo- 

 nigricante, albiradiatd. 



The EQUAL Fissurella. Shell oblong-ovate, rather 

 thin, depressed, decussated with distant obtuse radi- 

 ating and concentric stria3, orifice ovate, rather large ; 

 ashy black, rayed with white. 



SowERBY, Pro. Zool. Soc. 183'1, p. 137. 



Hub. St. Elena, West Columbia (on dead shells at a depth 

 of from six to ten fathoms) ; Cuming. 

 Unusually thin and depressed, with a rather large orifice. 



Species 5G. (Mus. Cuming.) 



Fissurella rugosa. Fiss. testd suboblongo-ovatd, antice 

 atteniwtd, depressd, costis octo iumidis riigosis radiafd, 

 interstitiis riigoso-Uratis et stria/is, hiurijine ImsuU 

 sin/ialo et dentato, ori/icio parciii-sviiln. iihUniijn-ia-ato ; 

 fused L't virescente, roseo hie iUir [imicttilii, ru.s/ix liic 

 illic albicantibus, iutics virescente. 



The rough Fissurella. Shell somewhat oljlong- 

 ovate, attenuated anteriorly, depressed, rayed with 

 eight rough swollen ribs, interstices roughly ridged 

 and striated, basal margin sinuated and dentated ; 

 brown and greenish, here and there pink-dotted, ribs 

 here and there whitish, interior pale green. 



SoWERBY, Conch. Illus. Cat. Fiss. p. 8. f. 5-t. 



Hab. Galiapngos I^kuids (under stones at low water) ; 



Cuming. 

 , 1849. 



