523 



53. Neritina spinosa (pi. ex. f. 61, 64), Budgin, Sovverby, 

 Tank. Cat., no. 1102. 



N. testa N. longispina simili, sed spinis brevioribus, plus 

 numerosis ; anfractibus spira? plus elevatis, ultima minus expansa; 

 apertura antice subangulata ; epidermide pallida, striis nigris fas- 

 ciata. 



Like N. longispina (Sp. 52), but with shorter and more 

 numerous spines ; the whorls of the spire more elevated, the last 

 whorl not quite so large ; the aperture slightly angular anteriorly ; 

 the epidermis a pale olive-green, with very sharply marked black 

 bands. 



From Tahiti. Cuming. 



54. Neritina Recluziana (pi. ex. f. 56, 57, 58), LeGuillon, 

 Rev. Zool, 1841, p. 345. 



N. testa oblique subovali, nigra, maculis luteis picta, spinis 

 breviusculis recurvis coronata ; spira brevi, anfractibus angulatis ; 

 apertura magna, alba, subobliqua ; labio externo inferne subpro- 

 ducto, superne ad suturam depresso ; labio interno obhquo, sub- 

 complanato, margine in medio arcuato, dentato. 



The aperture is sometimes expanded so as render the whole 

 figure as obliquely oval as N. longispina, but the whorl above the 

 spiniferous angle is always more rounded ; the columella is gene- 

 rally narrower, but in one specimen of the spineless variety it is 

 broad and swelled ; the outer surface is black, with orange spots. 



On stones in small streams ; New Ireland. B. B. Hinds, Esq., B.N. 



55. Neritina corona (pi. ex. f. 46-50 ; Var. mutica, pi. cix. 

 f. 1, 2), Linnaus, Syst. Nat. 'Nerita/ no. 720. N. montacuta, 

 Becluz, Zoological Proceedings, 1842, p. 174. N. brevispina, 

 Lam., Sowerby's Conch. 111. f. 8, a, h, c. 



N. testa oblique subquadrata, longitudinaliter subplicata, epider- 

 mide tenui induta, fasciis et maculis varie picta ; spira planiuscula, 

 anfractibus quatuor, superne angulatis, ad angulum spinis attenu- 

 atis plus minusve recurvis coronata ; apertura mediocri, plerumque 

 alba ; labio externo inferne vix angulato ; labio interno angusto, 

 subcomplanato, margine in medio arcuato, superne et in medio 

 obtuse dentato. 



Of a squarish form, externally plicated, and variously spotted 

 or banded; spire flat, consisting of four whorls, which are angu- 

 lated and coronated with middle-length, tapering spines ; aperture 

 middle-sized, with the outer lip simple, having a tendency, parti- 



