S T R .E A. 



Species 48. (Fig. n, b, Uus. Taylor.) 



OsTR.EA L.\CTE.\. Ost. testd ad Rhizoporas adJucrenti, 

 radialim plicatd transverse subovatd, solidd, lactea- 

 roseo fulvoqiie lincfd, subtils ccendced, inths cas- 

 taneo auroque subviridipicld, margiaibus cairuleis ; 

 impressione musculari utraque valvd dense cas- 

 taned ; marginibus lateralibus versus umbones den- 

 ticulatis ; valva superioris costis rotundis depres- 

 smsculis, valvcB inferioris subangulath, profimdis 

 rugatis, ad triargiuem ratcam .superiorem stiper- 

 antibtcs. 



The milk Ostu.e.^. Shell adlieriug to numgrovcs, 

 radiately plicate, transversely subovate, solid, 

 milk-white, tinted with rose and fawn, bluish 

 underneath, inside jiaintcd chestnut and greenish 

 gold with blue margins ; muscular impression in 

 each valve deep chestnut ; lateral margins den- 

 ticulated towards the umbocs ; ribs of the upper 

 valve rounded, rather depressed, of the lower 

 valve slightly angular, deep wrinkled, overreaching 

 the upper valve at the margin. 



SowEunT. 



//„/,. ? 



The blue tinted and rather regular ribs of the under 

 valve, and the golden tinted chestnut painting of the 

 interior, render this rather a pretty species. 



Species 49. (Fig. a, h, Mus. Taylor.) 



OsTRiEA ATTENDATA. Osi. testd !i>tl,Jl/>/Ji il.lli/, r (itteUU- 



atd, angustissimd solidd, lateral ili r ari imln. jmllu/d 

 superne fusco concentrice drigald, iul'us ■marjiue 

 crenato, nigrescenti, impressionibus muscularibus 

 nigris, cuneatis ; cardiue lato, producto, quad7'ato, 

 valvw inferioris elongato. 

 The attenuated Ostr^a. Shell longitudinally attenu- 

 ated, very narrow, solid, laterally arched, pale, 

 concentrically striped with brown, margin within 



crenulated, blacki.sh, muscular impressions black, 

 cuneate ; hinge wide, produced, square, that of the 

 lower valve elongated. 



SoWEIUiV. 



Hab. .' 



The long narrow tbrm of this species, and the den- 

 ticulations of its darkly coloured inner border, mark it 

 as very distinct. The concentric stripes described 

 would not probably appear if the outer surface of the 

 upper valve were not worn. 



Species 50. (Fig. a, b, Mus. Hanley.) 



OstRjEa tuberculahis. Ost. testa ovato-subtrigond, 

 valde ina'.quivah'i, foliaced, subobliqud ; valvd 

 superiori parvd, cowplanatd, rugoso-squamosd, 

 pallide subvindo-fuscatd, apice sid>spirali ; valvd 

 i7iferioriprofundd,utrinque uuriculatd, ad inargines 

 expansd, intils versus margines radiis violaceis 

 pictd, exttis fere oiauiiw /mrpai-ed, Icevigatd, plicis 

 divergentibus, liifi'n'ii/i/nrinibi(s, distantibus ar- 

 matd; margine ]i/ii atu, cndiue parvo. 



The tubercular Ostr^a. Shell ovally subtrigonal, 

 very inequivalve, foliaceous, suboblique ; upper 

 valve small, flattened, roughly squamose, pale 

 greenish brown, with subspiral apex ; lower valve 

 deep, auriculated on both sides, expanded at the 

 margins, painted towards the margins inside with 

 violet rays ; outside nearly all over purple, smooth, 

 armed with divergent tuborculiform distant plaits ; 

 margin plaited ; hinge small. 



Lamarck. 



Hab. Island of Timor. 



This shell is supposed by I\Ir. Hauley to be the 



Ostrcea plicatida of Philippi, but not of the earlier 



authors. It appears to me very fairly to represent the 



LamarcJcia7i species to which I have ventm-ed to 



September, 1871. 



