MACTRA. 



Plate XVIII. 



Species 93. (Mus. Cuming.) 



Mactra angusta. Mact. testa ovato-trausversd, angmtd, 

 suhtriyom, suhaqiiilateraU, compresm, alba, ienui, 

 fragUi, transversim regularitm- striata, latere antico 

 paulo hreviore, ohtmo, mipertie concaviusculo, postlco 

 sicperiie declivi, attemiato ; area angmtd, elongatd, 

 planulatd, utrhniue liratd ; Kmhonibus minimis, paruni 

 obliquis, regidariter iindato-plicatis ,- limuld minima, 

 lanceolatd. 



The nakkovv Mactra. Shell ovately transverse, nar- 

 row, rather triangular, nearly equilateral, compressed, 

 white, thin, fragile, transversely regularly striated, 

 anterior side a little the shorter, obtuse, rather con- 

 cave at the upper part, posterior side slanting at 

 the upper part, attenuated ; area narrow, elongated, 

 flat, with a ridge on each side ; umboes very small, 

 a Little oblique, regularly wave-plaited ; lunule very 

 small, lanceolate. 



Deshayes, Pro. Zool. Soc. 1854. 



Hab. Panama ; Cuming. 



A slender subtransparent Tellen-Wke shell, delicately 

 wave-plaited around the umboes. 



Species 94. (Mus. Cuming.) 



Mactra Triangula. Mact. testa gibboso-trigond, Corbn- 

 laformi, crassiiisculd, inipqiulaterali, atrinque obtuse 

 carinatd, transversim sulcato-striatd, sordide albd, la- 

 tere antico rotandato, postico concavo-attenuato, snb- 

 rostrato ; iimbonibiis tnniidis, approximatis ; Immld 

 aredque aniplis, lafis. 



The triangular JIactra. Shell gibbously triangular, 

 Corbula-shaped, rather thick, inequilateral, obtusely 

 keeled on each side, transversely groove-striated, dull 

 white, anterior side rounded, posterior concavely at- 

 tenuated, somewhat beaked ; umboes swollen, close ; 

 lunide and area large and broad. 



Renieri, Philippi, Euum. Moll. Sicil. p. 11. 

 Mactra Eiixiiiica, Krynioki. 



Hab. Mediterranean. 



A rather solid Corbula-shaped species, strongly striated 

 across, of a dull stone-colour. 



Species 95. (Mus. Cuming.) 



Mactra opposita. Mad. tesld trigoud, cuneiformi, (nqiii- 

 laterali, transversim striatd, ad mabones Iceoigatd, ni- 



May, 



tente, violaceo-albd, obscure fasciatd, pallidH rosea ra- 

 diatd; Immld aredque subamplis, aqualibus, eleganter 

 striatis, violaceo-fusco tinctis ; umbonibus approxima- 

 tis, intense violaceis. 



The opposite Mactra. Shell triangular, wedge-shaped, 

 equilateral, transversely striated, smooth and shining 

 at the umboes, violet-white, obscurely banded, rayed 

 with pale rose ; lunule and area rather large, equal, 

 elegantly striated, stained with violet-brown ; umboes 

 close, deep violet. 



Deshayes, Pro. Zool. Soc. 1854. 



Hab. Island of Luzon, Philippines ; Cuming. 



A triangular subequilateral species, faintly rose-rayed, 

 peculiarly stained with violaceous-brown on the area and 

 lunule, with the umboes tipped with very dark violet. 



Species 96. (Mus. Cuming.) 



Mactra lueida. Mact. testa subglobosd, twmidd, incBqui- 

 laterali, pallid^ cinered, rosea obscure temdradiatd, 

 versus umbanes incarnata-tinctd, latere autica rotun- 

 dato, postico arcuato-producto ; Immld aredque ele- 

 ganter striatis, violaceo-fuscescente tinctis ; umbonibus 

 subobliquis, approximatis, intus intense violaceo-ra- 

 diatd. 



The lurid Mactra. Shell subglobose, swollen, inequi- 

 lateral, pale ash, obscurely finely rayed with rose, 

 flesh-tinged towards the umboes, anterior side 

 rounded, posterior arcuately produced; lunule and 

 area elegantly striated, stained with light violet- 

 brown ; umboes rather oblique, opposite, interior 

 deep violet-rayed. 



Philippi, Abbild. und Besch. Couch. Mactra, p. 136. 

 pi. 3. f. 3. 



Hab. Island of Liewkiew, China Sea; Philippi. Island 

 of Negros, Philippines ; Cuming. 



A swollen gibbous species, flesh-tinged about the um- 

 boes, and richly stained in the interior with broad violet 

 rays. 



Species 97. (Mus. Cuming.) 



Mactra attenuata. Mact. testd avato-trigond, trans- 

 versd, teuui, turgidd, indequilaterali, transversim irre- 

 gnlariter dense striatd, livide violaced, ad umbones 

 atra-violaced, intus pallide violaced, latere antico hre- 

 viore, obtusa, snperne declivi, latere postico declivi, 

 trnncato ; umbonibus brecibus,parmn obliquis, approxi- 

 1854. 



