S T \l M A. 



Pi.ATi; X.WllI. 



Species S3. (Fig. a, i, Mu-. llanley.) 

 OsTit.-EA Ai:.\K.\N'KX.sis. Oi^l. ledd comjire^nd, suhtrit/oiul, 

 versua cardinem attcnmUA, pallide J'ulvd, ad 

 apicein purpiired, ad latera purpnreo strigntd, 

 tuherculis panis kvittr rwjald ; valvd ^Hperiorl. 

 ad latera versus cardinem denlicuhilA, medio alba 

 suhviridi-fasco circultiriter nehulato : apice sub- 

 spirali, retrorso. 

 The Ar.\kan- OstR/EA. Shell eomprfssed, sul.trig.mal, 

 attenuated towards tlic hinge, |)alc fulvons, pnr[)le 

 at the apex, stri[)e(l with purple at the sides, 

 slightly roughened with small tubercle.s, upper 

 valve denticulated at the sides towards the hinge, 

 middle white circularly clouded with greenish 

 brown ; apex subspiral, turning backwards. 



SOWKKP.V. 



Hab. -Vrakan. 



The curious circular clouding observable in the 

 larger specimen of the upper valve may possibly be 

 the result of some peculiar condition. The apex is very 

 peculiar, showing externally a strong s])iral turn, and 

 ending within in a point at the posterior terminus of 

 the hinge. 



Species 84. (>Ius. Ilanley.) 



OsTii^EA (inKSA. Ost. testd snborbindari, crns.fd, pal- 

 lide fiilvd, 7iigro-purpurasceHti late hiradiald, 

 squamosd, subspiraliter rufjosd, arcuatd, tumidd, 

 margine pliealo ; inlus incequaliter subviridi, cica- 

 trice majusculd, subreaiformi ; cardine parvo, 

 margine inlus prope umbones utrinque crenu- 

 lato. 



TuK obe.se OsTnjJA. Shell suliorbicular, thick, jiale 

 fulvous, widely biradiated with purplish black, 

 squamose, rugose, arched, tumid, plicated at the 

 edge ; unequally greenish within ; scar rather 

 large, rather reiiiform ; hinge small, margin with- 

 in crenulated on both side.- near the umbcies. 



SowEnBV. 



Hah. ? 



The group in the collection of Mr. Ilanley consists 



of two specimens attached to each other. The ui)[)er 



is evidently the younger of th 

 mn to exhibit plications du the n: 



Species 85. (Mus. Ilanley.) 



Osxn.EA ni(m;omai:i;in'ata. O.v/. tesfd ralud suptriori 

 (■'//»/>;•(•,«(?, siibqiiadrald, iiiijrcsi'i'iitl, undnlo- 

 !<<iiiniuosd, iiilits albd, mctn/iiie lulixsiinii v/i/ro . 

 airdiiii' Kubobliquo ; marginihiis hitii-itlihns- iilriu- 

 que prope cnrdinem, dcnticulia rutuntlix siihili.'tliiiiAi- 

 bus parris armatis ; vnlrd infeviori igiwtd. 



Tnic iu.ACK-l!ol!i>Ki:t:i) OsTli.'EA. Shell with upper valve 

 compres.sed, sulxpiadrate, blackish, undato-squa- 

 mose, white within, with a very wide black mar- 

 gin ; hinge rather oblique, lateral margins armeil 

 on each side near the hinge with rounded, rather 

 distant, small teeth ; lower valve unknown. 



SoWEUHY. 



Uab. Arakan. 



The large single valve figured is the only specimen 

 known, and as it e.xhibits none of the peculiarities of 

 the species which I have named Ost. Arakanensis, with 

 which it is locally associated, it appears worth a 

 provisional designation. 



Species 8G. (Mus. Taylor.) 

 OsTRiEA DUBIA. Ost. tcstd suborbicuhiri, tenvi, sub- 

 compressd, fuitco-purpurascenti, vel castaned, liiieis 

 niijresceiitihus irregulariius sparsim radiatd, verms 

 umhune.-i temiiter tiiberculatd, verms margines 

 undalo-pUcdtd, cardine parvo, valvd iriferiori lobis 

 tesiaceis armatis. 

 The dubious OsTUJiA. Shell suborbicular, tliin, 

 slightly compressed, purplish or chestnut-brown, 

 sparsely rayed with irregular blackish lines; hinge 

 small, lower valve armed with testaceous lobes. 



SOWERBV. 



Ihib. Island of Formosa? 



The orbicular form, the tuberculated surface near 

 the umbocs, and the dark linear rays distinguish this 

 species from Ostrcea folium, which it otherwise nearly 

 resembles. 



November, 1871. 



