524 



cularly when young, to be angulated at the lower part ; columella 

 obtusely dentated, having a sinus in the centre. The figures re- 

 ferred to, and the specimens in the Linnsean collection, point to 

 this species as being the true N. corona of Linnaeus. 



Island of Burias, Philippines ; on stones in small rivers. Cuming. 

 The spineless specimen figured (pi. cix. f. 1, 2) is from Western 

 Africa. 



56. Neritina brevispina (pi. ex. f. 45, 51, 52), Lamarck, 

 Anim. s. vert., New Ed., vol. viii. p. 572. 



N. testa N. corona simillima, sed spinis brevioribus, crassiusculis, 

 truncatis ; apertura magis contracts ; colore rubescente, lineis nigris 

 et macuhs albis picta. 



A thicker shell than N. corona (Sp. 55), with the aperture smaller 

 and yellowish ; the spines thicker and truncated ; the colour red- 

 dish, with black longitudinal lines, which are arcuated so as to 

 leave small whitish spots. 



Philippines. Cuming. 



57. Neritina stjbgranosa (pi. ex. f. 35-38), Sowerby, Conch. 

 111. f. 44. N. ruginosa, Recfaz, Eev. Zool, 1841, p. 310. 



N. testa N, corona simillima, sed sulcis longitudinalibus nigro 

 et albo marginatis rugulata, subviridi, anfractibus ad suturam 

 elevatis. 



Eesembling N. corona (Sp. 55), but with longitudinal fluctuating 

 grooves, which are edged by black and white interrupted lines. 

 The whorls are elevated at the suture. The spineless variety, f. 35, 

 is the same as that figured for the species in Conch. 111. f. 14. 



58. Neritina aspersa (pi ex. f. 43, 44), Recluz, MS. 



N. testa N. corona simili, sed minute rugulata, extus nigra, 

 punctis minutis albis sparsa, interne subviridi, ad basin columella! 

 oblique unicarinata ; apertura inferne angulata. 



Eesembling N. corona (Sp. 55), but with the surface roughened 

 by minute undulations, and an oblicrae keel behind the lower part 

 of the columella. The colour is black, sprinkled with minute 

 white specks outside, and greenish inside. The aperture is more 

 decidedly angulated, especially when young, than N. corona. We 

 have figured one specimen which has two rows of spines, some of 

 them double : this is accidental. 



Sandwich Islands. Mr. Cuming's Collection. 



