Em bin n. g. 



T. aequivalvis, postico 

 hians, truncnta; ligamen- 

 turn inlcrnum c fovea: utri- 

 usquo valvae insertum, un- 

 ite quam in v. d. dens car- 

 Jinalis b, in v. s. fossa car- 

 dinalis &', in v. s. dens la- 

 teralis anticus a et posti- 

 cus rf, in v. d. fossa la te- 

 ralis d'j denies Jaterales nulli. Impressio palliaris Jala, duplicata, 

 postice leviter sinuosa. Animal pallio venire aperto, poslice Jonge 

 cirrigero, siphonibus instructum. Specimen unicum mancum vidi. 



319. E. Korenii n. T. ovata, ventricosa, subaequilatera, antico 

 rolundata, postice truncate, alba, aculeis minutissimis creberri- 

 mis truncatis aspera, epidermide tenui; umbones proroinentes, 

 paullum ante medium siti, incurvi et antrorsum flexi; lunula 

 distincta, brevissima, lata; raargo lunularis leviter concavus, li- 

 gamentalis nonnihil arcuatus, ventralis Jevissime sinuatus, posti- 

 cus angulato-truncatus, hians, plica subduplirata obsoleta ab 

 angulo inferiore ad umbonern currente; cardo v. s.: dens latera- 

 ls anticus a obsoletus, marginalis; fossa cardinalis 6' profunda, 

 rotundato-trigona, infra aperta; fovea ligamenti c subovalis, Jon- 

 gitudinalis, ant ice et infra callo definita, poslice aperta; dens 

 posticus d Jaminaceus, marginalis; cardo v. d. : dens card, b bre- 

 vis, validus, prominens, apice truncate fissus, superne sulcatus; 

 fovea ligamenti c oblonga, obliqua, fossa postica rf', illae proxi- 

 mo, triangularis; impressio muscularis antica ovata, posterior 

 major, rotundata, ulraque superne lobo aucta; impressio pallia- 

 ris interna lacera, postice sinu levi, externa integra; *; mm. 

 dd.) Bergen. 



Thracia LEACH. 



320. T. con vex a (Mya) WOOD, (Anatina) TURT., (Amphidesma) FLJCG., 

 (Thracia) BROWN, THORPK, = T. declivis MACG. Bob. 



321. T. phaseolina (Amphidesma) LAJIK., (Thracia) KIKNKR, COUTH., 

 PHIL., annon = A. dccli\is TIHT.? (won PENN., Do*. 82, BROWN, 

 qua? = M. pulxvscens PULT.), annon = T. pubescens MACG.? 

 Processus cardinalis longitudinalis, subangustus, sed quam 

 in praecedente nonnihil robustior, o.ssiculurn validum; testa te- 

 nui.ssine .scuhia. 



322. T. distort a (Myal MONT., DILLW., (Anatina) TUKT. Processus 

 cardinalis prominulus, semiovalis; ossiculum validum; sinus pal- 



