73 
Long. 11 mill.; lat. 143 mill. ; convex. 103 mill. 
Affinis variet. Nerite dubie, sed columella basi non emarginata 
diversa est. Columella in centro partm inflexa. 
Nerita Donovana. Ner. testd semiglobosd, tenuiter et dens? stri- 
atd, viridescente, lineis obliquis purpureo-nigris, undatis, equidi- 
stantibus ornatd ; anfractibus tribus convexis, supra medium spinis 
curvatis armatis ; apice deroso ; aperturd cerulescente, basi effusd 
angulatdque ; labio angusto, superné calloso, basi concavo, margine 
subrecto, denticulato ; dente cardinali majori. 
Var. (3. Ovata, nitida, maculis viridibus et purpureis, dens? intricata ; 
ultimo anfractu superne adscendente ; spird prominuld, convexd. 
ffah. Island of Guimaras, on stones in a small stream. 
Long. 124 mill.; lat. 15 mill.; convex. 10 mill. 
Var. 3. Long. 14 mill.; lat. 15 mill. ; convex. 11 mill. 
Living examples of two species of Hypsiprymaus, belonging to the 
Right Hon. the Earl of Derby (President), were exhibited. 
