TRIBE PECTIN1DES. 293 



with elongated tapering subspathulate laminae that are generally 

 more or less curved : interstices devoid of sculpture. Var. The 

 ribs alternately larger and smaller. Var. Ground-colour blackish 

 purple, laniinae orange and reddish purple. 3£. Mauritius. There 

 are no indications of larger costa at the beaks. 



S. Maris-rubri, Bolten,for S. Aculeatus, dc. Ch. 7, p. 74,/. 460, 

 468.— S. A. Sow. Th. ],p. 419, t. 85,/. 11, 13.— S. Dentatus, Chenu, 

 II. C. Spon. t. 25,/. 1. Ribs very numerous, rather broad, of nearly 

 equal size, armed with crowded more or less flattened white or yellow 

 spinous laminae ; interstices usually of a purplish red, rendered sca- 

 brous by crowded radiating lines of squamular spines. 4. Mauritius. 



S. Nudus. Ch. \\,p. 235,/ 1989, 0.— Reeve, C. S. t. 119,/. 10. 

 —Chenu, II. C. Spon. t. 24, / 6.— Sow. Th. 1, p. 430, t. 88, / 39, 

 40. — S. Anacanthus, Mawe, t. 11, /. 3. Small, devoid of ribs, cos- 

 tellae or laminae ; colour scarlet and white, arranged in Hues, so that 

 either some of the subgranular raised striae which closely cover the 

 surface are white upon a brilliantly red ground, or are intensely red 

 upon a partially white ground. Var. A few of the striae with small 

 obsolete scaly tubercles. 1£. Bed Sea ; Philippines. 



S. Varians. Sow. Ap. Stutch.—Sow. Th. 1, p. 426, t. 86,/. 21, 2. 

 — S. Delessertianus and S. Obliquus, Chenu, II. C. Spon. t. 12, 

 and t. 24, /. 5. Ponderous, very large, oval, white, red at the urn- 

 bones, profusely covered with rather flattened and depressed elongated 

 spatulae ; hinge-area usually produced, and banded with brown ; 

 lower valve generally attached by nearly its whole surface, inside 

 often with water enclosed between the lamellae in aged examples. 

 Young. Smooth, triangular, orange or purple, with 5 or 6 beaded 

 ribs, and a very elongated hinge-area.. 12. South Seas. 



S. Leucocantha. Brod. Z. P. 1883.— Sow. Th. I, p. 423, *. 87, 

 / 35, 6. Of a whitish or pinkish flesh-colour, at most only obsoletely 

 ribbed, radiated with extremely numerous rows of strong curved 

 flattened and rather produced scales, which are white at their sub- 

 truncated apices, and pink at their commencement ; the larger of 

 them are broad-based in the more characteristic examples. Var. Of 

 an uniform purplish red, except at the beaks, which are devoid of 

 colour. 4. W. Columbia. There are generally 6 principal ribs, 

 between each of which stand 3 rows of scales, some of which are pointed 

 at the ends. 



S. Princeps. Brod. Z. P. 1833.— -Ifeew, C. S. t. 116, /. 2.— 

 S. Pictorum, Sow. (as of Ch.) Th. 1, p. 422, t. 88, /. 45. Of an 

 uniform colour that ranges from reddish to purplish crimson ; rayed 

 with numerous depressed ribs, none peculiarly prominent, but mostly 

 well defined and alternately larger and smaller. Ribs armed with 

 moderately close-set elongated spathuliferous laminae, which, in typical 



