MACTRA. 



Plate XIII. 



Species 58. (Mus. Cuming.) 



-Mactra oknata. Mact. testa ovato-transversd, compres- 

 sittsculd, tenuiculd, eequilaterali, lavigatd, substriatd, 

 antice obtusd, postice decUvl et ohliqiie triincatd, ad 

 uiiibones purpuraaceiite-rosed, in medio roseo obscure 

 radiatd, maculis albis marmoratd ; mnhonibus parvis, 

 lavigatis ; lunula ovatd,alhescente, striata ; valvis in- 

 ttts purpurascente-roseo tinctis ; sinu pallii lato, semi- 

 circulari. 



The ornate Mactra. Shell ovately transverse, rather 

 compressed, rather thin, equilateral, smooth, finely 

 striated, anteriorly obtuse, posteriorly slanting and 

 obliquely truncated, purple-rose at the umboes, ob- 

 scurely rayed with rose in the middle, and mottled 

 with white spots ; umboes small, smooth ; limule 

 ovate, whitish, striated ; valves stained within with 

 pm'ple-rose; sinus of the mantle broad, semicir- 

 cular. 



Gray, Ann. and Mag. Nat. Hist. 1837, p. 371. 



Hab. China Seas. 



Itichly stained and rayed with clear purple-rose, pro- 

 miscuously mottled with white. 



Species 59. (Mus. Cuming.) 



Mactra dissimilis. Mact. testa transversa, ovato-tri- 

 gond, inaquilaterali, turgiduld, nitidd, albo-grised, 

 transversim cinereo-zonatd, inttis purpurea -violaced, 

 latere antico paulo breviore, obtuso, sitperne recto, de- 

 clivi, latere postico siiperne conve.cmscnlo, extrendtate 

 obtuso ; umbonibus brevibns, acittis, postice obtuse an- 

 gulatis ; limuld aredqiie distinctis, eleganter sulcatis ; 

 valvis regulariter trausversim tenue sulcatis, sulcis ver- 

 sus umbones evanescentibus. 



The dissimilar Mactra. Shell transverse, ovately tri- 

 angular, inequilateral, rather swoUeu, shining, whitish- 

 grey, transversely ash-zoned, interior purple-violet ; 

 anterior side rather the shorter, obtuse, straight and 

 slanting at the upper part, posterior side rather con- 

 vex at the upper part, obtuse at the extremity ; um- 

 boes short, sharp, posteriorly obtusely angled ; lunule 

 and area distinct, elegantly grooved ; valves regu- 

 larly transversely finely grooved, grooves fading 

 away towards the umboes. 



Deshayes, Pro. Zool. Soc. 1854. 



Hab. Australia; Jukes. 



April, 



A rather soUd transversely grooved shell, of a violet- 

 ash hue, presenting somewhat of a Do7wx-YikQ aspect. 



Species 60. (Mus. Cuming.) 



Mactba pulchra. Mact. testa ovato-trigond, inaquila- 

 terali, tumidiusculd, solidd, antice breviore, rotundatd, 

 postice attenuatd, flavescente-cincred, obscure fusco- 

 radiatd, antice transversim regulariter sulcatd ; um- 

 bonibus tumidis, obliquis, lavigatis, violaceo-tinctis ; 

 area lumddque ovatis, fusco-violascentibus, eleganter 

 sulcatis, superne albis; sinu pallii angusto, obtuso, 

 prof undo ; valvis intus rufo-violaceis. 



The beautiful Mactra. Shell ovately triangular, in- 

 equilateral, rather swollen, solid, anteriorly shorter, 

 rounded, posteriorly attenuated, yellowish-ash, ob- 

 scm-ely brown-rayed, transversely regularly grooved 

 on the anterior side ; umboes swollen, oblique, 

 smooth, violet-tinged ; area and lunule ovate, brown- 

 violet, elegantly grooved, whitish at the upper part ; 

 sinus of the mantle narrow, obtuse, deep ; valves red- 

 dish-violet within. 



Gray, Ann. and Mag. Nat. Hist. 1837, p. 372. 



Hub. Eed Sea. 



A shining reddish-ash species, grooved on the anterior 

 side only, not distinguished by any particular beauty. 



Species 61. (Mus. Cuming.) 



Mactra incarnata. Mact. testa ovato-transversd, sub- 

 trigond, tumidiusculd, inaquilaterali, postice paululum 

 rostratd, tenuistriatd, nitidd, albidd, incarnato-roseo ele- 

 ganter radiatd ; umbonibus parvis, approximatis ; lunuld 

 aredque sublanceolatis, prominente sidcatis. 



The flesh-tinted Mactra. Shell ovately transverse, 

 subtriangular, rather swollen, inequilateral, posteri- 

 orly a little beaked, finely striated, shining, whitish, 

 elegantly rayed with flesh-rose ; umboes small, ap- 

 proximated ; lunule and area sublanceolate, promi- 

 nently grooved. 



Deshayes, Pro. Zool. Soc. 1854. 



Hab. Swan Eiver ; Bacon. 



A characteristic subrostrate transversely ovate shell, 

 prettily rayed throughout with flesh-rose. 



1854. 



