84 



T. ovali, crassa, subcompressa, ad latera postice paululum, 

 antice magis, hiante ; costis numerosis, angulatim interruptis, 

 in medio angulatim confluentibus ; auriculis striatis ; anticis 

 tumidis, subreflexis ; epidermide fusco : cardine crasso, 

 obsolete plicato. Nonnunqua mtesta irregulariter linguiformi 

 occurrit. 



Oval, thick, not very oblique, slightly gaping at the 

 posterior margin, rather more so at the anterior. The surface 

 is rendered scabrous by angularly notched ribs, meeting in 

 the centre ; the anterior auricles are tumid, with their edges 

 slightly reflected. 



2. L. TENERA. (pL xxi. f. 2,3, 10, 11, 13.) Chemn. 7- 

 p. 352., t. 68. f. 652.. Ostrea glacialis, var. Gmel. 3332= 

 Lam. &c. Test. jun. L. annulata. Lam. ? 



T. Limse scabree simillima, sed costis minutissimis, squa- 

 mis minutissimis erectis interruptis. 



Var. a. t. ovali. 



Var. /3. t. subelongata. Hab. Ins. Mindoro. 



Var. y. t. oblique subtrigona. Hab. Batangas, Philippi- 

 narum ; Singapore, &c. 



The difference lietween this and the preceding species 

 consists in the comparative fineness of the notched ribs ; 

 when in good condition they produce small, erect, seed-like 

 terminations to the notches, as represented in the magnified 

 portion of fig. 13. 



3. L. BULLATA (pi. XX. f. 32 and 33) Born. Mus. Cses. 

 p. 110. t. 6. f. 8. Chemn. 7- p. 348, t. 68. f. 649. b. 



T. elongato- ovali crassa, ventricosa, sub-sequilaterali, ad 

 latera vix hiante ; margine cardinali crasso, utrinque subtus 

 auriculis uniplicato ; auriculis validis subeequalibus, acutis ; 

 costis centralibus 20, validis, submoniliformibus, lateralibus 

 minoribus subevanidis. 



Elongated, thick, ventricose, nearly equilateral, scarcely 

 gaping at the sides ; hinge-margin thick, with a plication 

 under the auricles, which are thick, sharp, and nearly equal. 

 About 20 nodose, central ribs, and others less strongly 

 raised at the sides. Found at Sorsogon by Mr. Cuming, 

 in coarse sand, six fathoms. 



4. L. suBAURicuLATA. (pi. xxii. f, 23.) Mont. 



T. minuta Limte bullatee simillima, sed costis minutissimis. 

 A minute British species, differing from L. bullata in the 

 extreme fineness of the ri^s. 



5. L. SQUAMOSA, (pi. xxi. f. 1. 18.)Lam. Anim. sansVert. 

 6. p. 156. Ost. lima, Lin. Syst. Nat. Gmel. &c. 



