S T R .€ A. 



I'lATK XXVIII. 



Mus. ni-it. ; ,-, Mus. Ilanloy.) 

 Ost. Uvtit jKirvA, ad cuncluis 



Species GO. (Fig. 



)sri;.t:.\ concii.m-hi 



(idhcerenli, formd varianti, depressit, albidi, piir- 

 pureo stngatd aut viactilvtd, ttibercu/is parvis dlver- 

 ffentibtis lemter armald, intus alba aut pur/nurd, 

 cicatrice subccei-uled, margine versus cardinem 

 crenulato ; cardine tenui, vahtdd iiiferiuri nun- 

 quam profundd. 



The SiiK.LL-LoviNG OsTii^EA. Shell small, aiUnTing 

 to shells, various in form, depre.sseJ, whitish, 

 striped or spotted with puri)Ie, slightly armed 

 with small diverging tubercles, white or )iuri)lc 

 within, cicatrix ash-grey, margin erennluted 

 towards the hinge ; liinge thin ; lower valve 

 never deep. 



CAUrKNTEU. Mazatlan Shells in the British Museum, 

 p. IGl. 



llab. Mazatlan. Mexico. I'anama. 



Our figure a is a magnified view of a very small 



sliell found adhering to an A\ 



i-ery sii 



iinjinem 

 riiinibiis 



Species 70. (Mus. Ilanlcy.) 

 Osnt.KA INEKMIS. Od. testd irreguldri siibro'itndd, 

 subcompressd, ritgosd plicis 7n(igjiis, imbriaUis, di- 

 vergeniibus, angukitis, lumd tubercidijeris scidptd, 

 purpured, hitug subiridesceidi, vt 

 fused, cicatrice magnd, subrotundd, iivn-i 

 prope cardinem crenulatis ; umhonibus rcl 

 valvulA in/eriori tubiferd. 

 The UN.\rmeu Osti:.«a. Shell irregular mi 

 subcotnpressed, rugose, sculptured with lar 

 bricated, diverging, angular, not tubifV-rous 

 purple, subiridescent within, brown towat 

 margin, cicatri.x large, roundi.sh ; margin 

 lated near the hinge; uniboes turning Iiaek 

 lower valve tubiferous. 



lis shell has an atHnity with O. imbricata on tlie 

 hand, and with 0. Chemnilzii on the other. Its 

 g plications, which are imbricated but without 



tube-shaped tubercles, dit-tinguish 



first by 



aractcr, 

 .■lopment 



and from the second by their size 



Species 71. (Mus. Barclay.) 

 OsTH.v.A OEiiA'tA. Ost. legfd teiiHt, tiived, rvgosd, de- 

 presnd, obliiiigo-ovatd, (/((/■(puvalvi, margine crenu- 

 liilii : inli'is nived, opacd, cicatrice utrdque valvd 

 viviili caataiieo, cardine rectiilaculo ; valvd inf'eriori 

 hititudine alteram superanti, margine ventrali 

 foliaceo. 

 The wa.xed ostii.ea. Shell thin, snow-white, rough, 

 dejiressed, inecjuivalve, margin crenulated, snow- 

 white, within opaque, cicatrix in each valve 

 bright chestnut ; hinge rather straight, the lower 

 valve exceeding the other in width, ventral mar- 

 gin foliaceous. 



SoWEHliY. 



llab. Diego Garcia, Mauritius. 



One of the very beautifid oysters ol>tained by Sir 

 David Barclay from the interesting neighbourliood of 

 the Mauritius. 



OSTP^A 



pin 

 fen 



Species 72. (Mus. Ilanley.) 

 IIani.eyana. 0.-/. testd tenui, fused, pur- 

 > pallido subrnaciilatd, subreniforrtii, valvd in- 

 •i complanatd, foliaced, alteram longitudine et 

 ad kitera siiperanti, prope cardinem subauricu- 

 latd, maryiue superne crenulato ; cicatrice incon- 

 sjiicuo, eloiigato, cardine hrevi, valvd superiori 

 tiiberculis inconspicnis divariratis i-ugatd. 

 I Ian ley's OstI(^;a. Shell thin, brown, slightly 

 spotted with pale purple, nearly" reniform, lower 

 valve flattened, foliaceous, exceeding the other 

 in length and at the sides, subauriculated near 

 the hingr, margin crenulated at the upper 

 part, cicatrix inconspicuous, elongated, hinge 

 short ; upper valve roughened with inconspicuous 

 diverging tubercles. 



SOWERBY. 



llab. Sandwich Islands. 



An interesting shell in the collection of Mr. Ilacley 

 which I can reti.T to no other species. 



Xovember, 1871 



