NERITINA. 



Species 16. (Fig. a, h, Miis. Cumiug.) 

 Neritina Macgillivkayi. Ner. testa ilepresso-auriformi, 

 siilitii.s concavd, spird suliexsertd, plemmqne plus ndniis 

 erosd, anfractihus convexis, lavigatis, aferturd fere 

 circulari, expansd, area colnmellari latissimd ; oliva- 

 ceo-niffrd, aperiurd caridescenie, ared columellari 

 wiujidneo-tinctd. 

 Macgillivray's Neritina. Shell depressly ear-shaped, 

 concave beneath, spire rathei- exserted, generally 

 more or less eroded, whorls convex, smooth, aperture 

 nearly circular, expanded, columeUar area very broad ; 

 olive-black, aperture blue, columellar area blood- 

 stained. 

 Hah. Port Carteret, Solomon's Island. 



An elegant ear-shaped light depressed species, with a 

 broad expanded bluish aperture and large blood-tinged 

 columellar area. 



Species 17. (Fig. «, h, Mus. Cuming.) 



Neritina ovalis. Ner. testa depresso-ovali, tcniiicidd, 

 spird suban(/uste productd, vix exsertd, anfractihus spi- 

 raliter striatis, apc7'fiird sut/expansd, ared columellari 

 latissimd; nigra, aperturd ceerulescente, area colu- 

 mellari sanguineo-tinctd. 



The oval Neritina. Shell depressly oval, rather thin, 

 spire rather narrowly produced, scarcely exserted, 

 whorls spirally striated, aperture rather expanded, 

 columellar area very broad ; black, aperture bluish, 

 columellar area blood-tinged. 



Soweuby, Thesaurus Conchyliorum, p. ."jO?. 



Hab. Tahiti. 



Very like the preceding species, but narrower in form, 

 with the spire more centrally produced. 



Species 18. (Fig. a, b, Mus. Cuming.) 

 Neritina granosa. Ner. testa oblique trigono-ovatd, 

 depressissimd, utrinque dilatato-alatd, spird fere ohso- 

 letd, granuMs amplis tumidis dense sculptd, ared colu- 

 mellari latissimd, convexiusculd ; nigra, intus cmruleo 

 marmoratd, ared colmnellari snperne sangnineo-tinctd. 

 The grained Neritina. Shell obliquely triangularly 

 ovate, very depressed, dilately winged on each side, 

 spire almost obsolete, densely sculptured throughout 

 with large swollen granules, columellar area very 

 broad, rather convex; black, interior blue-mottled, 

 columellar area blood-tinged at the upper part. 



SowERUY, Tankcrville Catalogue, App. p. xi. 



Neritina papillosa. Jay. 

 Rah. Sandwich Islands. 



This fine depressly winged species is distinguished frc 

 all olhers by its characteristic sculpture of swollen gi 



Species 19. (Fig. n, b, ilus. Cuming.) 



Neritina piperina. Ner. testa globosd, soliditisculd, 

 spird obtuse planald, anfractibus supenie leviter con- 

 cavo-impressis, delude rotmulatis, lavigatis aut con- 

 centrice striatis, apertnrd semioirculari, ared colu- 

 mellari subangnstd, margine minwtissime dsnticidatd ; 

 olivaceo-lnted, macidis nigris trigoiiis nndique tessel- 

 laid, ared columellari carneo-anranlid,. 



The pepper Neritina. Shell globose, rather solid, spii-e 

 obtusely flattened, whorls slightly coneavely im- 

 pressed at the upper part, then rounded, smooth, or 

 concentrically striated, aperture semicircidar, colu- 

 mellar area rather narrow, very minutely toothed at 

 the ridge ; olive-yellow, tessellated throughout with 

 triangular black spots, columellar area flesh-orange. 



Nerita piperina, Chemnitz, vol. xi. p. 173. pi. 197. f. 

 1905, 1906. 



Uah. ? 



A solid globose species, peculiarly characterized by a 

 neat tessellated pattern of triangular black spots upon an 

 olive-yellow ground, while the columellar area and interior 

 are of a pale salmon-colom-. 



Species 30. (Fig. a, b, Mus. Cumiug.) 



Neritina Californic a. Ner. testd ovatd, temdculd, infra 

 concavd, spird subangustc' productd, apice obtuse pla- 

 natd, anfractibus Itsvigatis, aperturd expansd, ared 

 coluvtellari concavo-planatd, latiusculd; nigra, intus 

 cceruled, area columellari intense sanguined. 



The Californian Neritina. Shell ovate, rather thin, 

 concave beneath, spire rather nai-rowly produced, ob- 

 tusely flattened at the apex, whorls smooth, aperture 

 expanded, columellar area coneavely flattened, rather 

 broad; black, blue witliin, columeUar area deep 

 blood-stained. 



Hab. Gulf of California. 



This appears to be distinct from any of its congeners in 



form, while the deep-toned colouring is chai'acteristic. 



October, 1855 



