Zoological Society. 283 



Var. ^. T. nigerrimd, punctis albis sparsis notatd ; labia denticulato. 

 Var. e. ? T. fulvd, nigrescente tinctd, sub oculo et lumine punctu- 



lis pellucidis obsitd; spinis extrorsum curvatis ; ultimo anfractu 



basis costuld notato ; spird vix prominuld. 

 Long. 0-76; lat. 0-80 ad O'SS ; conv. 060 ad 0-64 poll. 

 Hab. Island of Burias : on stones in a rivulet. 

 I consider it mj' duty to dedicate this Nerite to the learned con- 

 ch ologist Montagu, as a homage due to his talents. 



19. Nerita Doxovani. N. testd semiglobosd , tenuh et dense striatd, 

 viridescente, lineis obliquis purpureo-nigrescentibus, equidistantibus 

 undatis ornatd ; anfractibiis tribus convexis, supra medium spinis 

 incurvis armatis ; apice deroso ; aperturd cccrulescente, basi effusd, 

 angulosd ; lab/o angusto, sitpern'e calloso, basi concavo, margine 

 subrecto denticulato ; dente cardinali inajori. 



Var. /3. T. ovatd, nitidd, maculis viridibus et purpurascentibus densi 

 tessellatd ; spinosd, ultimo anfractu superne ascendente, basi costuld 

 transversd notato ; spird prominuld. 

 Long. 0-50 ; lat. 0-60 ; conv. 0-40 poll. Var. /3, long. 0-56 ; lat. 

 0-60; conv. 044 poll. 



Hab. Island of Guimaras : on stones in a small stream. 

 TA^atever the difference of form and colour, it does not appear to 

 me possible to distinguish these two shells otherwise than as vari- 

 eties of the same tj'pe. Their operculum is unknown to me. 



20. Nerita Michaudi, Recluz in Rev. Cuv. 1841. p. 315. No. 38. 

 Var. ft. T. tenui, lineolis nigris longitudinalibus rectis creberrimis, et 



maculis luteis lined nigrd antice cinctis concatenatis iriserialibusque 

 pictd. 



Var. y. T. anfractibus supra medium spinis brevibus angustisque ar- 

 matis. 



Hab. Bauang, province of Pangasinan, isle of Lu9on : on small 

 stones on the bank of a river. 



21. Nerita PULCHELLA. N. testd subglobosd, nitidd, vix striatd, 

 luteo-viridescente, maculis nigris sagittatis et zonis tsqualibus re- 

 motis nigris lutescente articulatis ornatd ; spird nulld ; apice con- 

 vexo ; aperturd semi-rotundd, cccrulescente ; labio angusto, subcon- 

 vexo, superne calloso, antice subrecto, denticulato ; dente cardinali 

 majori. 



Var. ft. Testd sordide purpurascente, albo punctatd et zonis ceeruleo- 



viridescentibus albo-maculatis cinctd. 

 Var. y. Testd purpurascente, tnaculis albis nigro sagittatis et zonis 



nigris albo-articulatis ornatd. 

 Var. 2. Testd rubicundd, punctulis albis, antice obsolete purpureO' 



nigrescent ibus, antice marginatis marmoratd ; labro crassiore. 

 Long. 0-36 ad 0-40 ; lat. 0-44 ad 0-48 ; conv. 0-32 poll. 

 Hab. Sual, province of Pangasinan, isle of Lu^on : in a small 

 stream. 



Operculum of a Clithon, yellowish white, marked with a fine cir- 

 cular streak in the centre : two teeth at the summit of the interior 

 face ; the upper one short, yellow ; the lower one circular, yellow, 



U2 



