MACTEA.— Plate XVI. 



Eah. China Sea. 



A subtriangular rather swollen shell, of a peculiar livid 

 rose hue, irregularly obscurely banded across. 



Species 83. (Mus. Cuming.) 



Mactk.4. angtjlifera. Mad. testa ovato-trigond, tram- 

 versa, compressd, utroque latere kiante, subeequilaterali, 

 Candida, niiidd, transversim obsolete irregulariter stri- 

 ata, latere antico breviore, obtuso, supenie cmtcavius- 

 culo, postico declivi, brevi, truncato, angulo acuta an- 

 gusto oblique decurrente ; umbonibus brevibus, depressis, 

 obliquis, te/iue regulariter plicatis ; lunula ovatd, lavi- 

 gatd, concaviusculd, area angustd, concavd. 



The angled Mactra. Shell ovately triangular, trans- 

 verse, compressed, gaping on both sides, nearly equi- 

 lateral, white, shining, transversely obsoletely irre- 

 gularly striated, the anterior side the shorter, obtuse, 

 rather concave at the upper part ; posterior slanting, 

 short, truncated, with a sharp narrow angle running 

 down obliquely ; umboes short, depressed, oblique, 

 thinly regularly plicated ; lunule ovate, smooth, 

 rather concave, area narrow, concave. 



Deshayes, Pro. Zool. Soc. 1854. 



Hab. Island of Ticao, Philippines ; Cuming. 



A very compressed shining v.'hite species, with a singu- 

 larly oblique keel-edged area. 



Species 84. (Mus. Cuming.) 



Mactra symmetrica. Mact. testd trigond, aquilaterali, 

 turgiduld, Icevigatd, nitida, ad marginem inferiorem 

 traiisversiiii sulcata, pallidi Jlavicante, lateribus eequa- 

 liter declivibus et attenuatis, supenie coiwexiusculis, 

 margiue hiferiore regulariter arcuate ; lunula aredque 

 (Bqualibus, eleganter plicatis ; umbonibus oiimimis, 

 aculis, oppositis, antice macula violaced notatis. 



The symmetrical Mactra. Shell triangular, equilateral, 

 rather swollen, smooth, shining, transversely grooved 

 at the lower margin, pale yellowish, sides equally 

 slanting and attenuated, rather convex at the upper 

 part, lower margin regularly arched ; lunule and area 

 equal, elegantly plicated ; umboes very small, sharp, 

 opposite, marked in front with a violet spot. 

 Deshayes, Pro. Zool. Soc. 1854. i 



Eab. ? "Vito.-, Calltd^-^^ ^ '(•♦Jb. Ua/W\ . 



A plain Donax -\ike species, of a uniform yellowish 

 stone-colour, particularly neatly plaited on the lunule and 

 area. 



Species 85. (Mus. Cuming.) 



Mactra Eeevei. Mact. testd rotundato-trigond, iri/iatd, 

 solidd, subeequilaterali, transversim obsolete striatd, 

 epidermide tenui slramined lenue striatd lamellosd in- 

 dutd, albo-rufescente, maculis sparsis inmqualibns fuscis 

 ornatd, postici eastaneo-timtd, latere antico paulo bre- 

 viore, late rotundato, postico attenuato, declivi, brevi- 

 truncato ; umbonibus prominulis, approximatis ; lunula 

 aredque subindistinctis, simplicibus. 



Reeve's Mactka. Shell rotundately triangular, inflated, 

 solid, neai'ly equilateral, transversely obsoletely stri- 

 ated, covered with a thin finely striated lamellous 

 straw-coloured epidermis, whitish-red, ornamented 

 with a few unequal brown spots, posteriorly chestnut- 

 stained, anterior side a little the shorter, broadly 

 rounded, posterior attenuated, slanting, shortly trun- 

 cated ; umboes rather prominent, approximated ; hi- 

 nule and area rather indistinct, simple. 



Deshayes, Pro. Zool. Soc. 1854. 



Hab. New Caledonia. 



Allied to M. maculala, but more solid and Cylherea- 

 like, less attenuated posteriorly. 



