200 



sali posticd rectiusculd crenulatd; costis concentricis, acutis, crenu~ 



latis, confertissimis, tenuihus,fulvis : lotig. 1'9, alt.lb, lat.0'65 poli. 

 Hah. ad Sanctam Elenatn. 



A single valve of this elegant species was picked up on the sands 

 at St. Elena.— G. B. S. 

 Amphiuesma punctatdm. Amph. tesld ovali, crassiusculd, albi- 



cante, sparsim roseo fulvocue maculatd ,- postice subtruncatd, plicd 

 Jlexuosd posticali distinctd; disco ezterno concentrice impresso- 



punctato; marginibus, inferiori costis nonnullis concentricis latis, 



dorsalibus nntice et postice roseo maculatis ; long. \'7 , all. 1*35, 



lat. 06 poli. 

 Hah. ad Insulas Gallapagos. 



A perfect specimen and a single valve are all that Mr. Cuming 

 obtained. — G. B. S. 

 Amphidesma lenticulare. Amph. testd albd, lenticulari, levigatd, 



tenidssime radiatim striatd; parle mediand anticdgue striis elevatis, 



subconcentrids,Jlexuosis decussatd ; margine posticd subJlexuosd ; 



epidermide tenuisiimd,Jlavescente : long. O 87, alt. O'S, lat. 4*5 



poli. 

 Hab. ad Sanctam Elenam. 



A single specimen was dredged from a depth of sis fathoms in 

 sandy mud. — G. B. S. 



Amphidesma EhhivTicvM.— Amph. testd elliplicd, albd, subobligud, 

 IčBvi, epidermide f uscd ; latere antico longiore, rotundato, postico 

 breviore,oblique subtruncato ; superjicie concentrice leviter striatd : 

 long. 2, alt. 1-7, lat. 075 poli. 



Hab. in Columbia Occidentali (Monte Christe). 



Inside pure white. Dredged at a depth of nine fathoms in sandy 

 mud. — G. B. S. 



Amphidesma corrugatum. Amph. testd suborbiculari, albicante, 

 radiatim striatd, concentrice rugulosd ; epidermide fuscd ; margine 

 dorsali posticd rectd, inclinatd ; Intus Jlavescente : loyig. 2' \ , alt. 

 1-9, lat. 1 poli. 



Hab. in Peruvia et ad Iquiqui. 



Dredged from coarse gravel in ten fathoms water. — G. B. S. 



Amphidesma australe. Amph. testd suborbiculari, rotundatd, 

 albicante, radiis pallide roseis nonnunguam pictd, concentrici rU' 

 gosd : long. I, all. 1, lat. 0"5 poli. 

 Hab. in littoribus Novse Hollandiae et ad insulas Oceani Pacifici. 

 Found by Mr, Cuming in the crevices of the coral rocks at Lord 

 Hood's Island. 



I have had the printed descriptions of the three lašt species by me 

 for several years, but they have never been published. — G, B. S. 

 Genus Neritina. 

 Nebitina latissima. Ner. testd rotundatd, ventricosd, striis lon. 

 giludinalibus, minutis, creberrimis, fuscd luteo maculatd, maculis 

 numerosissimis ; labro dilatato, latissimo, spiram longi prater- 

 eunte; labio crenulato, subluleo : long. Ii, lat. \ i poli. 



