S T U .E A. 



Pi.vri.: 



Species 59. (Mus. Taylor.) 

 OsTnj!A MULTiiiADiATA. Ost. tcstd vugosd, comprcssd, 

 tenui, ftilvd, strigis numerosis puvpureis radiatd ; 

 marginibus expansis, laqueatis,foliaceis; latere an- 

 tico superne expanso, alato ; latere postico infrSt 

 expan.<o, valiicid inferiori irregularitcr costatd et 

 interstriatd ; cardine parvo, trigono. 

 The many-rayed Ostr^a. Shell rugose, com])re.ssecl, 

 thin, fulvous, rayed with numerous purple strite, 

 margins expanded, fluted, leafy; anterior side ex- 

 panded and winged above ; posterior side expand- 

 ed below, lower valve irregularly ribbed and iu- 

 terstriated ; hinge small, trigonal. 



SOWERBY. 



Hah. ? 



The outer surface of the lower valve is peculiarly 

 sculptured, with short ribs and striaj between and upon 

 them. 



Species GO. (Fig. a, b, c, Mus. Taylor.) 

 OsTRiE.*. AURicuLATA. Ost. testd solidd, squaiutferd, 

 suborhiculari, subfuscd, intus alhidd viridi vane- 

 gatd ; marginibus lateral ibus et ventralibus dense 

 plicatis, margine dorsali utrinque auriculatd ; niar- 

 gine postico ad latus excavate, ad marginem ventra- 

 lem acute producto ; valvd superiori comjihmatd, 

 dense squamosd et costellatd, valvd inferiori valde 

 convexd, infrd, auriculas dense divancatim cos- 

 tellatd, medio et ad marginem ventralem costis majori- 

 bus, incequalibus, nonnullis prominente tuberculaio- 

 spinosis ornatd. 

 The auriculated Ostr.ea. Shell solid, sqiiamiferous, 

 suborbicular, brownish, whitish within variegated 

 with green ; lateral and ventral margins closely 

 ribbed, dorsal margin auriculated on each side, 



XXV. 



posterior margin excavated at the side, acutely 

 produced at the ventral margin ; upper valve 

 flattened, closely scaly and ribbed ; lower valve 

 convex, closely divergently ribbed ; in the middle 

 and towards the ventral margin ornamented with 

 larger, unequal ribs, some of them prominently 

 tubercularly spinoso. 



SOWEUBY. 



II ab. Japan. 



The specimens of tlic following species are seen 

 growing upon a large luider valve of this species, which 

 does not show the auricles so clearly as in fig. 60, a, b, 

 but in which the excavated margin and the diverg- 

 ing side ribs under the auricles are seen still more 

 plainly. 



Species CI. (Mus. Taylor.) 



OSTR.EA jiulticostata. Ost. tcstd ovato-oblongd,/usco- 

 purpureo, medio concentrice strigato, versus mar- 

 gines dense squamosd et costellatd,, intiis alhidd, 

 versus margines ptirpureo radiatd ; vcdvuld. supe- 

 riori tvmidiusculd; valvuldinferion extiis piirpured, 

 radiatim costellatd, coslellis rotundatis, ad latera 

 divaricatis. 



The MANY-RIBBED OsTRjEA. Shell ovately oblong, pur- 

 plish brown, concentrically striped in the middle, 

 densely squamose towards the margins, purple 

 rayed ; upper valve rather tumid ; lower valve 

 purple without, radiately ribbed ; ribs rounded, 

 divergent at the sides ; margins closely crenulated. 



Sowerby. 



Hob. Japan. 



The only specimens I have met widi are attached 



to the lower valve of a s]iecimen of tlie preceding 



species. 



September, 1.S71. 



