Dr. E. von Martens on the Subdivisions of Pinna. 87 
*nobilis, L., Poli, 34. 1, 35.5; Gualt. 78 A; Chem. 787 = ro- 
tundata, Gmel. Encycl. 200. 2 = squamosa, Lam. Medi- 
terranean. 
aculeatosquamosa, Chemn. 777; nobilis, Lam. Encycl. Méth. 
200. 1; Reeve, 10 & 57. P. muricata, Poli, 33. 4. Medi- 
terranean. 
*obeliseus, Chemn. 784 = squamosa, Gmel., rotundata, Reeve, 3. 
Mediterranean. 
electrina, Reeve, 25. Moluccas. 
(b.) Of elongate triangular form, both long sides being nearly 
equal. 
flabellum, Lam., Reeve, 18. P. haud ignobilis, Chemn. 769 
(? earnea, Gmel., Desh.). West Indies. 
*muricata, L., Reeve, 23 (Chemn. 1817). West Indies. 
semicostata, Reeve, 30. Philippines. 
*hystrix, Reeve, 60 ; saccata, Chemnitz, 779 (non L.). Amboyna. 
angustana, Lam., Reeve, 51. 
Sumata, Hanley, Reeve, 27 (287). Philippines. 
*rugosa, Sow., Reeve, 50. Panama. 
( virgata, Menke, Reeve, 45. Philippines. 
Philippensis, Reeve, 20. Philippines. (See Note 3.) 
*atropurpurea, Reeve, 41. 
regia, Reeve, 56. Amboyna. (See Note 3.) 
vespertina, Reeve, 44. (See Note 3.) 
 Menkei, Reeve, 34. 
*euglypta, Hanley, Reeve, 37, 38. Amboyna. 
} Zebuensis, Reeve, 26. Philippines. 
The last forms a close passage to the next group. 
(c.) Of elongated arcuated form. (Cyrtopinna, Morch.) 
*Licolor, Chemn. 780; Reeve, 17; dolabrata, Lam., Encycl. 
Méth. 200. 3. Malacca. 
madida, Reeve, 31. Port Essington. 
*incurva, Gmel., Gualt. 80 ; Chemn. 778 (see Note 2) ; Reeve, 8. 
Indian Ocean. 
Rumphii, Hanley, Reeve, 9. Moluccas. 
Philippinarum, Hanley, Reeve, 20. Philippines. 
attenuata, Reeve, 46. Moluccas. 
{ Stutchburyi, Reeve, 64. Moreton Bay. 
Ill. Pinne contorte. 
*saccata, L., Rumph, 46 N., Encycl. 200.4; Reeve, 6. Red 
Sea, Moluccas, Philippines. 
elongata, Conrad, Reeve, 6”. Sandwich Islands. 
The following nominal species seem to be founded on young 
