716 



Formed like F. decorata, but instead of the continuous concen- 

 tric ribs, it lias only leafy imbrications upon the distinct radiating 

 ones. The specimen kindly supplied by Mr. Hanley is very de- 

 licately coloured with a purplish tint on and within the umboes, 

 a light brown on the lunule and posterior area, with a pink tinge 

 upon the ribs. Mr. Cuming's specimen has dark brown ribs with 

 white interstices. 



Locality unknown. 



37. Venus Cochinensis (pi. clvi. f. 79, 80), Thorpe, ? 



V. testa ovaU-subcordata, parva, postice subangulata, paUide 

 fulva vel grisea, prope umbones livida, postice valide colorata, cos- 

 tis squamiferis rotundatis validis radiata, interstitiis angustatis. 



Like V. imhricata, but flatter, with the ribs less elevated, and 

 rather granulated than imbricated. 



Cochin China. 



38. Venus squamosa (pi. clvi. f. 83, 84), Lirmceus, Syst. 

 Nat. p. 1133. Cythersea squamosa, Lamarck, no. 75. 



V. testa subtrigona, ventricosa, albo-grisescente, partim ob- 

 scure fuscata, costellis duplicatis moniliferis prope marginem 

 magis numerosis radiata, rugis interruptis concentricis noduliferis 

 cincta; latere postico productiore, contracto, rostrato; margine 

 dorsali declivi, fusco, planulatim excavato ; latere antico brevius- 

 culo, rotundato; lunula magna, rotundata, fusca, striata ; margine 

 interne crenulato. Variat lunula, area dorsali, et inter costas cas- 

 tanea. 



This common, triangular, rostrated shell has an appearance of 

 scales formed by the concentric undulations crossing the radiating 

 duplicate costse. 



Bay of Manilla, in sandy mud. Cuming. 



39. Venus plexuosa (pi. clvi. f. 85, 86), Linneeus, Syst. 

 Nat. p. 1133. V. impressa, Anton, Hanley, Wood's Supp. pi. 16. 

 f. 27. 



V. testa subtrigona, ventricosa, alba, fuscescente vel grisescente, 

 immaculata, vel nigro interruptim triradiata, radiatim striata, 

 rugis concentricis crenulatis cincta; latere postico productiore, 

 contracto, rostrato, margine dorsali declivi, planulatim excavato, 

 livido ; latere antico rotundato ; lunula laevigata, excavata ; mar- 

 gine interno Isevi. 



It is not ribbed, but simply striated in the radiating direction^ 



