NERITINA. 



Species 21. (Fig. a, h, c, Mas. Cuming.) 



Neritina longispina. Ni'i: tf-itd siibyWmd, spird plm 

 iuiiiiis exserid, atifmctihiis supcnti: coiicavo-di'duHbiis, 

 delude spiiiis longissunk seriatim coroiiatis, aperturd 

 expai/sd, rnnrf/iue jit.tta spinas siuitato vel cmaftjinalo, 

 an'd cuhtmcllari suhaiu/nstd ; iidcnsii ni/jrd, an-d colii- 

 mi'Uan iulerdtim puUidii sanrjuinco-thtctd. 



The long-spined Neritina. Shell subglobose, spire 

 more or less exserted, whorls concavely slanting at 

 the upper part, then coronated with a row of very 

 long spines, apertiu'e expanded, simiated or notched 

 at the edge next the spines, columellar area rather 

 narrow ; intense black, columellar area sometimes 

 faintly blood-tinged. 



Recluz, Revue Zool. Soc. Cuvierieune, 1S41, p. 313. 

 Nerita corona, Chemnitz (not of Linnanis). 



llab. Island of Rodriguez (on stones in small streams) ; 

 Hinds. 



This very remarkable shell, described by Chemnitz and 

 Lamarck as the Linna3an Nerita corona, is fully proved by 

 the specimens of the author of the ' Systcnia Natura-,' in 

 the possession of the Linnrean Society, to belong to an- 

 other species. 



Species 33. (Fig. a, i, JIus. Cuming.) 

 Neeitina diadema. Ner. testd snlMjlohosd, tmuicidd, 

 spird ahhreriato-tmritd, anfrucliljus siipernii concavis, 

 deinde anfjulatis, ad anijiduufortilcr spinosis, obliqw 

 corrugato-siriatis vel lavibits, area columellari siib- 

 auyustd, subveriicali, marijine deidicidatd ; corneo- 

 brmnu'd rd nigricante, interdi/m :onidis ani/nsiis lideis 

 clnijidaid. 

 The diadem Neritina. Shell subglobose, rather thin, 

 spire shortly tun-eted, whorls concave round the 

 upper part, then angled, strongly spined at the angle, 

 obliquely wrinkle-striated, or smooth, columellar area 

 rather narrow, nearly vertical, finely toothed at the 

 edge ; horny-brown or blackish, sometimes encircled 

 with narrow yellow zones. 

 Reclifz, Revue Zool. Soc. Cuvierieune, 1841, p. 277- 

 Ilab. Philippine Islands (on stones in small streams) ; 

 Cuming. 



Of a horny-brown or black, sometimes ycllow-zoued, 



wrinkle-striated or smooth, coronated with strong re- 

 cm'ved spires. 



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



Neritina obscdrata. Ner. testd ylobosd, sotidinscnld, 

 spird obhisi depressd, anfractibns superni I'lcetiribus, 

 deinde seriatim brevispinosis, undiipie lomjilndintditcr 

 corrwjatia, aperturd snbcirctdari, area columellari sub- 

 anffustis, marffine arciiatd; fusco-rdgrd vel olivaced, 

 nigro-:onatd. 



The obscure Neritina. Shell globose, rather solid, 

 spire obtusely depressed, whorls slanting round the 

 upper part, then short-spined, everywhere longitudi- 

 ually wrinkled, aperture somewhat cu-cular, colu- 

 mellar ai-ea rather narrow, arched at the edge; 

 brown-black or olive, black-banded. 



Recluz, Revue Zool. Soc. Cuvierieune, 1842, p. 183. 



Ilab. Island of Mindanao, Philippines ; Cuming. 



Of rather solid globose foi-m, with a wrinkled surface, 

 crowned with short irregular spines. 



Species 24. (Fig. a, b, Mus. Cuming.) 



Neritina subgranosa. Ner. testd globosd, spird ub- 

 hreriato-turrild, interdmu rude obtusd, anfractibus 

 superii!} iiiigidatis. nunc hivihiis, nunc angulatis et 

 spinosis, J'nrliti'r enrn'gidn-xl riatis, snbgranosis, area 

 columellari m/gnstd, iidi-rdm.i expansd ; vireseente- 

 ol.ivaccd. 

 The GiiANULATED Neritina. Shell globose, spire shortly 

 turreted, sometimes rudely obtuse, whorls angled 

 round the u]Dper part, now smooth, now angled and 

 spined, strongly wrinkle-striated, granulated, colu- 

 mellar area narrow, sometimes expanded ; greenish- 

 olive. 

 Recluz, Revue Zool. Soc. Cuvierieune, 1841, p. oil). 

 Hah. Philippine Islands ; Cuming. 



Of this subgrained wrinkle-striated specimen Mr. 

 Cuming possesses specimens, as illustrated in the accom- 

 panying Plate, convoluted into a smooth, obtuse, rudely- 

 constructed spiral, as weU as into one concavely turreted 

 and spined. They present little or no variation of coloiii-, 

 all being of a uniform greenish-olive. 



October, 18.5 .5. 



