278 Zoological Society. 



Hah. Pasaguing, province of North Ylocos, island of Lu9on : on 

 stones in a small river. 



The operculum of this species does not differ from that of N.pul- 

 ligera, except in its colour, which is of a brownish black, faintly and 

 indistinctly striated with fawn-colour from the summit to the anterior 

 margin ; the striae often scarcely apparent. 



5. Nerita Panatana. N. testd parvd, ovato-hemisplmricd, ven- 

 tricosd, postice angustatd, tenui ; luteo-viridescente, lineolis nigres- 

 centibus angiilato-flexuosis creherrimis pictd ; unfractihus l^ su- 

 premo eroso-retuso ; aperturd extus orbiculari, intiis dilatatd, 

 albido-ccerulescente ; columelld semi-lunar i pland, albd, antice rec- 

 tiusculd. 



Long. 0'28; lat. 0-40; conv. 0-20 poll. Apertura altit. et diam. 

 0-28 poll. 



Hab. River Dingle, province of Ylo-Ylo, island of Panay : on 

 small stones. 



Operculum unknown. This species resembles some varieties of 

 Ner. dubia, but differs from them by its form and by its spire ; also 

 in the absence of any depression at the inferior margin of the colu- 

 mella. 



6. Nerita crepidularia (Lamarck). 



Var. major. T. hemisphcericd, crassiusculd, dorso fornicatd, pur- 

 pureo-nigrescente maculis quadratis luteis tessellatd, aperturd ex- 

 tus continud paJlide cinnamomed ; labio subplano, in medio longitu- 

 dinaliter arcuatimque sulco notato, antice arcuatim crenulato. 

 Long. 0-80; lat. 1-04; conv. O'GO poll. 



Hab. Jimmaymilan, isle of Negros : found on the trunks of the 

 Nepa Palm, in brackish water. 



I do not see in the characters of this Nerite anything to cause its 

 separation from the Keritina crepidularia. Lam. ; N. mitrula, Menke, 

 ' Synopsis,' p. 48 ; nor from the N. violacea, Gmelin, if it is not its 

 larger proportions. I presume that the Patella neritoidea, Linn., 

 Mus. Lud. Ulr., p. 688. No. 409, is the same shell, worn and occu- 

 pied by a Pagurus. 



7. Nerita Rangiana, Recluz in Guerin,Rev. Cuv. 1841. p. 339. 

 No. 46. 



Var. minor. T. j^ulchre viridi, punctulis albis, antice nigra margi- 

 natis, transversim 2-4 seriatis, ad suturam maculis albis subarcu- 

 atis lacteis ornatd. An Ner. viridis, Sowerb)'-, Conch. lUustr., 

 f. 24 } 

 Long. 0-23; lat. 0-24 poll. 



Hab. Dumaguete, island of Negi-os : found in a small stream. 

 Operculum green, slightly concave above, finely striated length- 

 wise, with two other circular striae from the summit to the posterior 

 margin ; very convex underneath, hollowed at the posterior side for 

 the insertion of the muscle, and provided with two teeth at the top ; 

 the upper one very short, lamellated, and truncated at the summit ; 

 the second circular, equally short, dilated into a sort of plate on the 



