362 MACTRID^. 



M. STULTORUM, Linnseus. 



Rather thin, inclined to be trigonal, equilateral ; beaks white : 

 dorsal areas never chestnut at the junction of the valves : lateral 

 teeth smooth. 



Plate XXII. figs. 4, 6, and Plate XXVI. fig. 2. 



Cardium stidtorum, Linnaeus, Syst. Nat. ed. 10, p. 681. 



Mactra shdtorum, Pulteney, Hutchins Hist. Dorset, p. 31. — DoNOV. Brit. 



Shells, vol. iii. pi. 106.— Mont. Test. Brit. p. 94.— Linn. 



Trans, vol. viii. p. 69.— Dorset Catalogue, p. 32, pi. 8, f. 



3. — TuRT, Conch. Diction, p. 81. — Turt. Dithyra Brit. 



p. 72. — Flem. Brit. Anim. p. 427. — Macgill. Moll. 



Aberd. p. 287. — Brit. Marine Conch, p. 47. — Brown, 



Illust. Conch. G. B. p. 107. — Dillw. Recent Shells, vol. 



i. p. 138. — Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 99. 



(in part) — MAWE,Conchology,pl. 8, f. .5. — Crouch, Introd. 



Conch, pi. 4, f. 4 Soaverby, Conch. Manual, f. 79. — 



Hanl. Recent Shells, p. 29. — Chenu, Illust. Concliyliol. 



Mactra, pi. 3, f. 3. 

 TcUina radiata, Penn. Brit. Zool. ed. 4, vol. iv. p. 87. pi. 49, f. 30. 

 Tri(joneUa radiata. Da Costa, Brit. Conch, p. 196, pi. 12, f. 3. 

 Mactra chierca, Mont. Test. Brit. Suppl. p. 35. — Turt. Dithyra Brit. p. 73. — 

 Flem. Brit. Anim. p. 428. — Brit. Marine Conch, p. 47. 

 „ magtm, Woodward, Geol. Norf. pi. 2, f. 10. 



Although not exactly identical with the Linnsean type, 

 which comes nearer to the inflata of Philippi (En. Moll. 

 Sic. vol. i. p. 11, pi. 3, f. 1), we have not ventured to re- 

 gard the differences as of more than varial importance ; for 

 a more diffuse dissertation upon the typical stultorum, we 

 must refer our readers to the " Ipsa Linnsei Conchylia " of 

 Mr. Hanley, the publication of which has been deferred, 

 owing to the present work occupying his entire time. 



Both in shape and colouring this is a very variable shell. 

 The former ranges from simply elliptical to broadly sub- 

 triangular ; the latter from fawn-coloured, covered with 

 more or less narrow white rays, and generally adorned 

 with paler zones, to an uniform ash-colour, passing through 



