PATELLA. 



Plate XI. 



Species 21. (Fig. a, b, c, Mus. Cuming.) 



Patella vakicosa. Tat. testa suhollonyo-ovatd, antics 

 pauluhim contractu, convexd, apice antice inclinato, 

 radiatlm costatd, costis latis, vrregiilarihm, fere ohso- 

 letis ; virescente-alM, purpwreo-caManeo tinctd et ve- 

 nosd, intus venosd et variegatd. 



The vakicose Limpet. Shell rather oblong-ovate, a 

 Uttle contracted in front, convex, apex inclined an- 

 teriorly, radiately ribbed, ribs broad, irregular, nearly 

 obsolete; greenish-white, stained and veined with 

 purple-chestnut, veined and variegated interior. 



Hnb. Tierra del Fuego ; Cuming. 



The painting of this shell, when not obscured by age, is 

 very similar to that of P. veriosa of the preceding plate. 

 The form of the shell is a more oblong-oval, and the ribs 

 of the surface are broad and almost obsolete. 



Species 22. (Kg. a, b, Mus. Cuming.) 



Patella vidua. Pat. testa ovatd, convexiusculd, fortiter 

 acute costatd, costis alternatim minoribiis, niinide sqica- 

 matis, sqiiamis distantibus, casta alternd interdum fere 

 obsoletd; ferrugineo-nigrd, ajnce erosd, iutus albidd, 

 fascia lata ferrugineo-7iigrd ad marginem, nucleo pal- 

 lidefernujineo. 



The widow Limpet. Shell ovate, moderately convex, 

 strongly sharply ribbed, ribs alternately smaller, mi- 

 nutely scaled, scales distant, the alternate rib some- 

 times nearly obsolete, rusty-black, eroded at the apex, 



interior whitish, with a broad rusty-black band at 

 the edge, nucleus pale rust. 

 Hob. Island of Camiguing, Philippines. 



A moderately convex shell, rayed with sharp ribs, al- 

 ternately larger and smaller, each rib being roughened 

 with minute somewhat distant scales ; the chief charac- 

 teristic of the species lies in its broad deep rust-black 

 marginal border. 



Species 23. (Fig. a, b, Mus. Cuming.) 



Patella aspeea. Pat. testa ovatd, snboctagond, antice 

 paululmii contractu, leviter convexd, varie irregulariter 

 costatd, tindique tenuiliratd, liris squamato-spinosis ; 

 albidd, ferrngineo vel atro variegatd, iutus pellucido- 

 albd, margine crenulatd. 



The bough Limpet. Shell ovate, suboctagonal, a Kttle 

 contracted in front, slightly convex, variously irre- 

 gularly ribbed, finely ridged throughout, ridges stjua- 

 mately spinose ; whitish, variegated with rust or 

 black, interior peUueid-white, crenulated at the 

 margin. 



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

 529. 



Eab. Madeira. 



Of a suboctagonal form, but little convex, rudely irre- 

 gularly ribbed and densely finely ridged, the ridges being 

 profusely scale-spined. 



October, 1854. 



