NERITINA. 



Plate VIII. 



Species 34. (Tig. «, h, Mus. Cuming.) 

 Neritina eeclivata. Ner. testa, /jloboso-conoidca, tu- 

 Midd, soUdd, spird olitmd, sidijjroductd, aufmctibits 

 concavo-declwihits, turn rolundutk, area colnmdlari 

 tmiiidd ; li/icis oUvaceo-nlgm iindiqiti' (/eiisissime 

 pictd. 

 The bulging Neuitina. Shell globosely conoid, swoUen, 

 solid, spire obtuse, rather produced, vvliorls concavely 

 slanting round the upper part, rounded at the base, 

 columellar area swollen; very densely painted through- 

 out with olive-black lines. 

 Say, Journ. Acad. Nat. Sci. Pluladelphia, vol. ii. p. 3.57. 

 Hub. Jlexico. 



This peculiar conically bulging species is painted longi- 

 tudinally with fine olive-black lines, so densely as to give 

 the appearance of a uniform tint. 



Species 35. (Fig. a, b, j\[us. Cuming.) 



Neritina circumvoluta. Ner. lestd suborbicu/ari, 

 spird obtuse iii/pressd, anfractibus convexis, plicato- 

 corruffaiis, dei.iule Itni/jatu, area volmnellari acute 

 declivi; olimceo-li'ted, fasciis duatms nir/ris distan- 

 tibifs cingidatd. 



The encircled Neritina. Shell suborbicular, spu-e 

 obtusely impressed, whorls convex, plicately wu-inkled 

 round the upper part, then smooth, columellar area 

 sharply slanting ; olive-yellow, encircled with two 

 distant black bands. 



Eecluz, Sowerby, Thesaurus Conch, part 10. p. 537. 

 pi. 115. f. 203, 203. 



Hab. Island of Negros, Philippines (on stones in a moun- 

 tain stream) ; Cuming. 



An obtuse orbicidar shell, encircled with two charac- 

 teristic uarrow black bauds. 



Species 36. (Fig. a, b, Mus. Cuming.) 

 Neritina semiconica. Ner. testa oblongo-fjlohosd, spird 

 subobtuse couicd, anfractibus concavo-hnpressis, deiiule 

 convexis, Icevigalis, area cohmiellari sabangustd, cal- 

 losd, margine minute denticulatd ; lutescente-olivaced, 

 maculis nigris quadratis sparsim fasciatd, area colu- 

 mellari carneold. 

 The semiconical Neritina. SheU oblong-globose, 

 spire rather obtusely conical, whorls concavely im- 



pressed round the upper part, then convex, smooth, 

 columellar area rather narrow, callous, minutely den- 

 ticulated at the edge ; yellowish-olive, sparingly 

 banded with square black blotches, columellar area 

 carnelioa. 



Lamarck, Anim. sans vert. vol. viii. p. 574. 



Hub. Banks of the Gauges, Calcutta. 



The spots of this species, usually of an obliquely square 

 form, sometimes flow longitudinally into each other. 



Species 37. (Fig. a, h, Mus. Cuming.) 



Neritina Caffra. Ner. testa glohoso-couoided, solidd, 

 spird obtuse productd, anfractiljus superne co/icavo- 

 impressis, deiiide convexis, ttevigatis, area cohmiellari 

 luliiiscidd, callosd, aperticrd subcontnictd i oli.mceo- 

 aird. 



The Caffre Neritina. Shell globosely conoid, solid, 

 spire obtusely produced, whorls concavely impressed 

 round the upper part, then convex, smooth, colu- 

 mellar area rather broad, callous, aperture rather 

 contracted ; olive-black. 



Gray, Wood, Index Test. Supp. pi. 8. f. 10. 



Hub. Mauritius. 



An intensely dark oljtusely conoid species, of somewhat 



rude growth. 



Species 38. (Fig. a, b, Mus. Cuming.) 



Neritina Crepidclaria. Ner. testa ovatd, Crepidula- 

 foridi, spird antice intortd, subtm concavo-planatd, 

 area colmnellari latissima, margine integro, undiqm 

 expanso, aperturd parvd; olivaced, aperturd et area 

 colmneUuri intense carneolis. 



The Crei'idiila-like Neritina. Shell ovate, Crepidula- 

 shaped, spire twisted inwards anteriorly, concavely 

 flattened beneath, columellar area very broad, with 

 margin entire, expanded throughout, aperture small ; 

 olive, aperture and columellar area deep earnelion. 



Lamarck, Anim. sans vert. vol. viii. p. 572. 

 Clithon C'repidiilaria, Lesson. 

 Neritina Touranensis, Souleyet. 

 Neritina nielanostoma, Trosehel. 



Ilab. Ceylon, Bengal. 



Distinguislied from aU other species by its Crcpidula- 



like plan of convolution. 



