NERITINA. 



Plate III. 



Species 11. (Fig. a, I/, Mus. Cuming.) 



Neritina Beckii. Nir. testa depresso-ovatd, subtus cou- 

 caviusculd, spird plano-bnpressa, anfractibits coiiceu- 

 trice irregulariter striatis, area columellari Icn'ujald ,■ 

 nigra, lahro bitiis aurantio-rufo, area columellari 

 fumeo-Uvidd. 



Beck's Neritina. Shell depressly ovate, rather cou- 

 cave beneath, sph'e flatly impressed, whorls concen- 

 trically ii'regidarly striated, columellar area smooth ; 

 black, lip orange-red within, columeUar area smoky 

 livid. 



Recluz, Revue Zool. Soc. Cuviericune, 184.1, p. 275. 



Hab. ? 



Scarcely distinguishable from varieties of N. indUc/era, 



and of somewhat doubtful specific value. 



Species 13. (Fig. a, b, Mus. Cuming.) 



Nekitina IMakcuionata. Ner. testa depresso-orbicidari, 

 tenuicidd, spird siibe.vsertd, anJ'ractUms convexis, jiixla 

 spirau conciiBo-imjiressis, aperturd suhexpansd, area 

 columellari margine vuriuti denticulatd ; nigra, sapis- 

 siwi luteo consjiicue undulatd. 

 The ]\lAKauESAS Neritina. Shell depressly orbicular, 

 rather thin, spire slightly exserted, whorls conve.x, 

 coucavely impressed next the spii-e, aperture rather 

 expanded, columeUar area rather narrow, minutely 

 toothed at the edge ; black, mostly conspicuously 

 waved with yellow. 

 Hab. Marquesas Islands. 



A light elegantly convoluted sjiocies, with the whorls 

 impressly concave next the spii-c, with the columella nar- 

 row and minutely toothed at the edge, and the aperture 

 rather expanded. The yellow waved marking is some- 

 times boldly zigzag, sometimes minutely freckled. 



Species 13. (Fig. a, b, Mus. Cuming.) 

 N ERITINA latissima. Ner. testa depresso-ylobosd, utrinqite 

 latissime alatd, spird pared, distinctd, anfractibus ro- 

 tundatis, juxta spirant impresso-concavis, lavigatis, 

 subplicato-corrngatd, aperturd expausd, labro utriiique 

 peciiliariter dilatato, area columellari latd, convexius- 

 ctdd; olivaced, maculis minutis luteis idgro-imbratis 

 deme lentiginosd, area columellari carulescente, carneo- 

 tiuetd. 

 The very broad Neritina. Shell depressly globose, 

 very broadly winged ou each side, spire small, dis- 



tinct, whorls rounded, impressly concave next the 

 spire, smooth, somewhat plicately wrinkled, aperture 

 expanded, lip peculiarly dilated on each side, colu- 

 mellar area broad, rather convex; olive, densely 

 speckled with minute dark shaded yellow spots, co- 

 lumeUar area bluish, flesh-tinged. 



Buodeeip, Pro. Zool. Soc. 1833, p. 300. 



Hab. Real Llejos (adhering to fluviatile rocks) ; ( fuming. 

 This very remarkable species is distinguished from all 



others of the genus by the prolonged wing-like dilatation 



on each side of the lip. 



Species 14. (Fig. a, b, Mus. Cuming.) 

 Neritina intermedia. Ner. testd subglobosd, iutcrdnm 

 tumidiusculd, spird subexsertd, rude convoluld, aiifrar- 

 libus conve.m, interdum pUcato-corrugatis, aiwrturd 

 late expamd, ared colnmellari latd, convexiusculd ; 

 ulivaceo-fused, luteo dense lentiginmd. 

 The intermediate Neritina. Shell subglobosc, some- 

 times rather swollen, spire a little exserted, rudely 

 convoluted, whorls convex, sometimes plicately 

 wrinkled, aperture broadly expanded, columellar area 

 broad, faintly convex ; olive-brown, densely freckled 

 with yellow. 

 Broderip, Pro. Zool. Soc. 1833, p. 201. 



Eadcm var. N. globosa, Broderip. 

 Hab. Central America (found abundantly on stones in a 

 mountain stream in the Isle of Lions, Bay of Mon- 

 tejo) ; Cuming. 

 Very like N. hUissima, despoiled of the winged dilata- 

 tion of the lip, but specifically distinguished in having the 

 spire more rudely convoluted. 



Species 15. (Fig. a, b, Mus. Cuming.) 



Nekitina dolium. Ner. testd subanguste globosa, so- 

 lidd, spird obtusd, vix exsertd, anfractibus superue 

 concavo-declivibus, delude convexis, ared columellari 

 submigustd ; oUvaceo-nigrd. 



The tdn Neritina. Shell rather narrowly globose, solid, 

 spire obtuse, scarcely exserted, whorls concavely 

 slanting round the upper part, then convex, colu- 

 mellar area rather narrow ; olive-black. 



Recluz, MS., Mus. Cuming. 



Hab. Beneoonet, Sumatra (in a muildy stream) ; Cuming. 

 A solid, obtuse, smooth, olive-black shell, impressly 



concave beneath the sutures. 



October, 1855. 



