386 Zoological Society. 



Nerita Powisiana. Ner. testd ovato-transversd, ventricosd, su- 

 perne depresso-planiusculd, varie pictd ; spird brevissimd, derosd, 

 auriculd elevatd, marginatd ; aperturd ovatd, dilatatd, externe sub- 

 rectd; labio pianissimo, antice recto, acuto et sub lente ruguloso. 



Var. a. Testd lutescente, nebulis pallidis vix purpurascentibus vari- 

 egatd. 



Var. /3. Testd ut in var. a, maculis nigerrimis characteriformibus, 

 triseriatim cinctd. 



Var. y. Testd luteo-fuscescente, lineolis nigris undulatis, longitudi- 

 nalibus, dense notatd. 



Hab. Var. a and /3, New Ireland, in mountain-streams, by R, B. 

 Hinds, Esq., Surgeon of H.M.S. Sulphur. 



Long. 19 mill.; lat. 14 mill.; convex. 12 mill. 



Species vald^ mirabilis. Var. y. Hab. ? Mr. Powis. 



Nerita Turtoni. Ner. testd ventricoso-ovatd, luteo-rufd seu rubi- 

 cundd, flammis nigrescentibus undatis, remotisque, sive angulato- 

 flexuosis pictd ; anfractibus 4—5 , convexis, supremis derosis : infimo 

 superne horizontaliter depresso ; labio subconvexo, fusco-rubente, 

 margine in medio tenuiter crenato, basi leviter emarginato ; labro 

 intus calloso-albo, ad marginem fusco rubente. 



Hab. } Mr. Powis. 



Long. 15 J mill. ; lat. 13 ad 14 mill. 



Neritce variegata. Lesson (Ner. pulchra, Sowerby), vald^ affinis. 



Nerita nebulata. Ner, testd ovato-globosd, tenuiter striatd, luteo- 

 fuscescente, lineis nigris squamceformibus parvulis ?iebulatd; spird 

 prominuld, rotundatd ; labio angustato, subconvexo, margine retius- 

 culo, crenulato, fiavescente ; labro semi-ovato, intils ccerulescente, 

 margine flavo. 



Hab. Immimaylan, in a mountain- stream. 



Long. 10 mill. ; lat. 11 mill. ; convex. 8 mill. 



Nerita Mertoniana. Ner. testd ovato-globosd, maculis pallide lu- 

 tescentibus zonisque articulatis nigro-purpurascentibus fimbriatis 

 cinctd ; spird vix prominente, rotundatd, apice eroso ; aperturd ob- 

 liqud, luteold ; labio subconvexo, angusto, margine tenue arcuato et 

 crenulato. 



Var. /3. Testa major, lineolis intricatis picta. 



Hab. cum prsecedente. 



Long. 9 ad 10 mill. ; lat. 11 ad llf mill. ; convex. 7f ad 8 mill. 



Affinis Nerita Oualaniensis, Lesson, sed major, solidior, minus ro- 

 tundata et variegata : non var. robustior. 



Nerita Michaudiana, Recluz in Rev. Cuvi^rienne, Paris 1841. 



Var. /3. Testa rotundata, supra medium spinis angustis brevibusque 

 armata. 



Hab. cum typo ad " Bunang, province of Pangasinan, isle of Luzon, 

 on small stones on the bank of a river." DD. Souleyet et Cuming 

 invenierunt. 



Nerita Jovis. Ner. testd ventricoso-ovatd, nigrd, lineolis angulato- 

 flexuosis fulgurantibusve albis pictd, punctatdque ; anfractibus 

 quinis convexis ; spird conico-depressd, nigr o -violas cente, albo 



