TRID ACN A. 



Plate VII. 



Species 7. (Fig. a, b, Mus. Cuming.) 



Trid.\cna Cumingii. Trid, testa ovatd vel oblongo-ovatd, 

 gibbosiusculd, qiiadri- ad quinque-coslatd, costis con- 

 spicue radiatim liratis, nitide regulariter squamatU, 

 squamis erectis, costarum interstitm copiose corrugato- 

 llratis ; costis squiimisque citrinis, costarum intersti- 

 liis vivide rufescente-croceis. 



Cuming's Tkidacna. Shell ovate or oblong-ovate, rather 

 gibbous, four- to five-ribbed, ribs conspicuously ra- 

 diately ridged, neatly regularly scaled, scales erect, 

 interstices between the ribs copiously \vrinkle-ridged ; 

 ribs and scales lemon-yellow, interstices between the 

 ribs bright reddish-sail'ron. 



Hab. Philippine Islands; Cuming. 



This very beautiful Tridacna, of which specimens are 



represented in our Plate, in different stages of growth, 

 appears to be very distinct from any hitherto described. 

 The ribs and scales are of a delicate lemon-colour through- 

 out, while the interstices are of a rich reddish-saffron. It 

 is very neatly scaled, and the radiating ridges in the in- 

 terstices between the ribs have a peculiar interruptedly- 

 wrinkled character. 



Fig. 5 b, c, (Mus. Cuming.) 



The specimens here figui'cd are intended to illustrate 

 T. compressa, as distinguished from T. elongata, in an earlier 

 stage of growth than the specimen described and figured 

 in the preceding Plate. That at Fig. 5 5 is a pale lemon - 

 colour. 



June, 1862. 



