237 



Dr. Gould presented descriptions of the following Shells, 

 from the collection of the Exploring Expedition. 



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. Dlam. 

 ■^jj, alt. 4- poll. 



Like N. Bruguieri 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 

 leviter striata, castaneo-fusca, subtus interdum lineolis flexuosis 

 nigris picta ; spira vix exserta, ultimo anfractu recurrente fere 

 involuta : apertura oblique semicircularis, magna, postice canali- 

 culata ; labro flavo ; labio planulato extrinsecus sanguineo tincto ; 

 columella alba, valde sinuata, denticulata. Operculum tenue, 

 lividum, sulco divisum, granulatum, ad apicem flavidum. Diam. 

 |- poll. Hob. Feejee Islands. 



Allied to the dark varieties of M. duhia, but distinct by its in- 

 volved and girded spire, like N. Bruguieri, and also by its very 

 sinuous and strongly-toothed pillar lip. It has a channel towards 

 the spire much like N. canalis, whose color and marking of the 

 ventral face it also resembles. 



Neritina chrysocolla. Testa solida, oblique conico-globosa, 

 coracina, lineis exilibus obliquis flavidis flexuosis picta : spira 

 elevata, erosa ; anfr. 2-3 ventricosis, infra suturam aliquid con- 

 strictis ; apertura oblique semi-elliptica ; labro coeruleo, viridi 

 limbato ; labio convexo, luteo-virente ; columella sinuata, dentic- 

 ulata : operculum osseum, salmonaceum, costa bisectum. Long, 

 f , lat. f , poll. Hah. Upolu. 



Of the same group as N. communis, lugulris and Jielvola, but 

 distinct by its green, blue-edged outer lip and yellowish green 

 pillar lip, as well as by its very delicate zigzag lines, scarcely 

 seen except on the ventral face. 



