THRACI A. 



Plate III. 



Species 12. (Mus. Cuming.) 



Thracia Anatinoides. Thr. testa oblique ovatd, tenui, 

 pellucidd, postice abbreoiato-angulatd, concavo-ros- 

 tratd, hiante, antice late rotundatd, ampliter conve.vd, 

 tumidd, mbhiante ; subvitreo-alhd. 



The Anatina-like Thracia. Shell obliquely ovate, 

 thin, transparent, posteriorly shortly angled, concavely 

 beaked, gaping, anteriorly broadly rounded, largely 

 convex, swollen, a little gaping ; somewhat glassy- 

 white. 



Hab. Sydney, Australia. 



This, it will be seen, is of a totally different type from 

 the European Thracia, and presents a typical relationship 

 with the beaked Anatinee of the same locality. 



Species 13. (Mus. Cuming.) 



Thracia Australica. Thr. testa subtrigono-ovatd, soli- 

 diusculd, postice abbreviato-angulatd, valvd sinistra 

 plana, conceit trice, preesertim versus umbones, plicato- 

 striatd, umbonibus et angulo postico subacutis ; opaco- 

 albd. 



The Australian Thracia. Shell somewhat triangu- 

 larly ovate, rather solid, posteriorly shortly angled, 

 left valve flat, concentrically plicately striated, espe- 

 cially towards the umboes, umboes and posterior 

 angle rather sharp ; opaque-white. 



Hab. Moreton Bay, Australia. 



This little species partakes of the peculiar Australian 

 type of bivalve shell represented by Myadora. It is of 

 rather solid substance, more sharply angled towards the 

 umboes than any of the European forms of Thracia, and 

 has no indication of the characteristic scabrous graining. 



Species 11. (Mus. Cuming.) 



Thracia fabula. Thr. testa ovato-cuneatd, subcom- 

 pressd, solidiusculd, latere postico obtuse declivi, antico 

 subattenuato-rotundato ; opaco-albd, laevigata. 



The little bean Thracia. Shell ovately wedge- 

 shaped, somewhat compressed, rather solid, posterior 

 side obtusely sloping, auterior rather attenuately 

 rounded; opaque-white, smooth. 



Hab. ? 



A small, smooth, wedge-shaped shell, with the true 



characteristic dentition of a Thracia. 



Species 15. (Mus. Cuming.) 



Thracia similis. Thr. testa ovatd vet oblongd, gibbo- 

 siusculd, latere postico parum angulato, interdum suh- 

 attenuato, latere antico latiore ; sordide alba, irregu- 

 lariter concentrice striata. 



The similar Thracia. Shell ovate or oblong, rather 

 gibbous, posterior side but little angled, sometimes 

 rather attenuated, anterior side broader ; dead-white, 

 irregularly concentrically striated. 



Courthouy, Boston Jouru. Nat. Hist. vol. ii. p. 150. 

 pi. 4. f. 3. 



Hab. Brazil. 



The only species known from South America. It par- 

 takes of the northern type, but varies in being sometimes 

 oblong, as in Courthouy's figure, and sometimes inclined 

 to beaked-ovate, as in our own. 



Species 16. (Mus. Cuming.) 



Thracia squamosa. Thr. oblnngo-ovatd, postice declivi- 

 augulatd et truncatd, antice declivi-rotundatd, gibbo- 

 siuscttld ; albidd, rude concentrice striata, granoso- 

 scabrosd. 



The scaly Thracia. Shell oblong-ovate, posteriorly 

 slopinglv angled and truncated, anteriorly slopingly 

 rounded, rather gibbous ; whitish, rudely concentri- 

 cally striated, granosely scabrous. 



Carpenter, Pro. Zool. Soc. 1S55, p. 229. 



Hab. Mazatlan, California ; C. Shipley. 



The Californian representative of the European T. vil- 



losiuscula and phaseolina. 



Species 17. (Mus. Cuming.) 



Thracia concinna. Thr. testa ovatd, convexd, postice 

 subanguste augulatd, parum truncatd, antice subatte- 

 nuato-rotundatd ; lavigatd, lacted. 



The neat Thracia. Shell ovate, convex, posteriorly 

 rather narrowly angled, but little truncated, anteriorly 

 somewhat attenuately rounded ; smooth, milk-white. 



Gould, MS. in Mus. Cuming. 



Hab. San Nicolas, Island of Zebu, Philippines ; Cuming. 



A neat, smooth, milk-white species, with no indication 

 of the scabrous graining common in the northern species 

 of the genus. 



November, 1859. 



