1867.] MR. H. ADAMS ON NEW SHELLS. 307 



mellari paulo minore, illi parallela ; perist. simplici, margine 

 dextro vix expunsiusculo, intus medio unidentato, columellari 

 calloso, dilatato. 



Long. 4, diam. 2i mill. ; ap. 2 mill, longa. 



Hab. Port Louis Harbour, Mauritius. 



Plecotrema exigua, H. Ad. (PI. XIX. fig. 15.) 



P. testa profunde rimata, ovato-conica, solida, spiraliter valde 

 sulcata, longitudinaliter striata, pallid e fulv a ; spira conoidea, 

 apice mxicronata ; anfr. 8, planiusculis, infra suturam sidco 

 profunda et lato exaratis, ultimo basi attenuato, pone apertn- 

 ram valde cristate ; apertura subobliqua, angusta ; plicis parie- 

 talibus 2, superiore tuberculiformi, altera bipartita ; plica co- 

 lumellari compressa, subhorizontali ; perist. simplici, margini- 

 bus callo crasso junctis, dextro intus incrassato, tridentato, 

 dente superiore minuto, columellari dilatato, patent e. 



Long. 6, diam. 3^ mill. ; ap. 2 mill, longa. 



Hab. Trou d'Eaux Douces, Mauritius. 



8. Descriptions of New Species of Shells. 

 By Henry Adams, F.L.S. 



(Plate XIX.) 



Nanina (?Rotula) conulus, H. Ad. (PI. XIX. figs. 16, 16a.) 



N. testa imperforata, trochiformi, tenui, oblique striata, superne 

 liris spiralibus obsoletissimis signata, rubella-cornea, ad cari- 

 nam et ad suturas pallidiore ; spira canaidea, apice abtusius- 

 cula, sutura distincta ; anfr. 6, canvexiusculis, ultimo non 

 descendente, carinato, basi convexo ; apertura subobliqua, te- 

 tragono-lunari ; perist. recto, acuta, ynarginibus convergentibus, 

 columellari verticali, superne breviter reflexo. 

 Diam. maj. 11, min. 10, alt. 12 mill. 

 Hab. Newera Ellia, Ceylon {Coll. F. Layard). 

 This species, which is closely allied to N. concavospira, Pfr., was 

 obtained by Mr. Frederick Layard from Newera Ellia, Ceylon, at an 

 elevation of 6500 feet above the level of the sea. I have referred it 

 with doubt to the subgenus Rotula, the animal of the typical species, 

 N. detecta, not being known. In the figure given of the animal, in 

 this case, the truncature of the foot is distinctly shown ; while the 

 animals of certain Indian species, considered by Mr. W. T. Blanford 

 to belong to the same subgenus, are without such truncature, the 

 mucus-pore being above the flattened posterior extremity. 



BuLiMULUs (Ena) pusillxjs, H. Ad. (PI. XIX. fig. 17.) 



B. testa sinistrorsa, rimato-perforata, cylindrico-turrita, tenui, 

 incequaliter striata, vix nitidula, olivaceo-fusca ; spira elongata, 

 sursum parum attenuata, apice obtusiuscula, sutura distincta ; 



