47 



The whorls are very cylindrical, so as to appear like a succes- 

 sion of bulbs. It is much like M. perfusca, Anthony ; but in that 

 the whorls slope gently to the suture. A broken specimen shows 

 that it often attains a considerable size. 



Melania furfurosa. Testa turrita, ovato-pyramidata, tenuis, 

 scabriuscula, dilute fulva, et prope suturam fusco maculata, striis 

 arcuatis incrementalibus et striis volventibus tenuissimis decus- 

 sata : spira integra, anfr. 7 rotundatis, confertis, superne sub-ta- 

 bulatis ; ultimo magno, ventricoso ; supernis oblique plicatis : 

 apertura lunata, ad columellam effusa. Long, f, lat. § poll. 

 Hab. Manila. 



Allied to M. scalra, which is more elongated, and its whorls 

 much less cylindrical, its stria? coarse and distant, and crowned 

 with spino-tubercles. 



Melanopsis Zelandica. Testa solida, ovato-conica, nitida, 

 olivacea, fusco-trifasciata : spira conica, brevis, acuta ; anfr. 3, 

 supernis planulatis et ad suturam confluentibus ; ultimo magno, 

 postice planulato, antice ventricoso : apertura elliptica, ccerules- 

 cens, rufo-fasciata, postice in canalem obducta; labro acuto : 

 columella valde arcuata et excavata, postice callo tuberculoso 

 copioso instructa. Long, -j 9 ^, lat. ■£■$ poll. Hab. New Zealand. 



Compared with M. prcerosa, Lin., it is more plump, has but 

 3 instead of 6 or 7 whorls, the aperture proportionally longer : 

 the columella remarkably arched ; and the surface and aperture 

 are banded with dark chestnut. 



Neritina porcata. Testa obliqua, sub-hemispherica, solidi- 

 uscula, fusco-rubricans, maculis parvis nigris interdum tessellata, 

 longitudinaliter striata et rugis conspicuis ordinatis sub-imbrica- 

 tis porcata : spira vix tumida, anfractu ultimo penitus involuta ; 

 apertura parva, lunata ; labro callo aurantiaco intus munito ; labio 

 piano, amplo, sanguineo ; columella arcuata, denticulata. Diam. 

 •/^j, alt. £ poll. Hab. 



Like N. Britguieri and canalis, it has the spire wholly involv- 

 ed in the last whorl. The former has a somewhat elevated spire, 

 a larger aperture, and a smooth and silky instead of a ridged 

 surface. The latter is distinct by the canal which winds along 

 the suture. 



Neritina cholerica. Testa oblique semiglobulosa, solidula. 



