Zoological Society. 283 



Var. h. T. nigerrimd, punctis albis sparsis notatd ; labio 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 0*88 ; conv. 060 ad 0*64 poll. 

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

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

 chologist Montagu, as a homage due to his talents. 



19. Nerita Donovani. N. testd semiglobosd, tenue et dens^ striatd, 

 viridescente, lineis obliquis purpurea -nigrescentibus, equidistantibus 

 undatis ornatd ; anfractibus tribus converts, supra medium spinis 

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

 angulosd; labio angusto, superrie calloso, basi concavo, margins 

 subrecto denticulato ; dente cardinuli majori. 



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

 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. 0*44 poll. 



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

 Whatever the diiFerence of form and colour, it does not appear to 

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

 eties of the same type. Their operculum is unknown to me. 



20. Nerita Michaudi, R^cluz in Rev. Cuv. 1841. p. 315. No. 38. 

 Var. /3. T. tenui, lineolis nigris longitudinalibus rectis creberrimis, et 



maculis luteis lined nigrd antice cinctis concatenatis triserialibusque 

 pictd. 



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

 matis. 



Hab. Bauang, province of Pangasinan, isle of Lu9on : on sm^tll 

 stones on the bank of a river. 



21. Nerita pulchella. N. testd subglobosd, nitidd, vix striatd^ 

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

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

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

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

 majori. 



Var. /3. Testd sordide purpurascente, albo punctatd et zonis ceeruleo- 



viridescentibus albo-maculatis cinctd* 

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



nigris albo-articulatis ornatd. 

 Var. Z. Testd rubicundd, punctulis albis, antice obsolete purpurea - 



nigrescentibus, antic^ 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 



