NERITA. NERITE. 125 
others ending in a fine point, and placed somewhat late¬ 
rally: aperture oval or half-moon shaped ; the outer mar¬ 
gin very thin; pillar-lip reflected, forming a lar ge and deep 
perforation behind it : length sometimes an inch and a 
half 5 breadth rather less. 
Variety A. With the volutions more produced to a point, 
and without the coloured markings. 
Nerita lavida. Lister , pi. 569. f. 20— Laskey , JVern . 
Soc, i. pi 409. 
Variety B. Highly polished, with the volutions flat and 
hrdlv distinguishable, more elongated and sloping to a fine 
point, of a white color shaded with pale carnation ; the first 
marked with five rows of arrow-shaped crimson spots, one 
row of which continues round the base of the lesser ones, 
the fourth and sometimes the third chain consisting of 
short oblique lines ; the outer-lip with an oblong crimson 
patch behind it: length three-quarters of an inch; breadth 
half an inch. 
This variety is so different in its contour and markings 
i (rom the N. glaucina of the same size, that we are much in¬ 
clined to think it a distinct species. It is found plentifully 
ia Dublin bay, always preserving its separate character. 
On most sandy coasts, v . v. 
Nerita Canrena. Bonnet Nerite. Eig. H, 
Lister, pi. 560. f. 3, 4, pi. 564. f. 11. 
Nerita intricata. Donovan, pi. 167- 
Shell exactly resembling N. glaucina, but is more pro¬ 
duced and pointed ; and the perforation is furnished with 
two spiral ridges, making it gibbous and cloven : length 
half an inch ; breadth rather less. • 
On the Western coast: very rare. v. m. 
4. Nerita Mammilla. Nipple Nerite. 
Lister, pi. 571. fi 22, and pi. 566. f. 14. 
Nerita nitida. Donovan, pi. 144. 
Shell oval-oblong, glossy, white or yellowish: spires five, 
short, fiat, and hardly defined, the suture being nearly ob¬ 
literated : aperture oval, the perforation being nearly or 
quite closed by the gibbous protrusion of the pillar-lip : 
m 3 length 
