1906.] MOLLUSKS FROM THE PERSIAN GULF. 809 



Pecten luculentus Reeve. 

 I. Karachi, rarely. 



Pecten maldivensis E. A. Smith. 



Pecten maldivensis E. A. Smith, Fauna & Geogr. of Maldive &, 

 Laecadive Archipelagoes, vol. ii. part 2, p. 622, pi. xxxvi. figs. 19, 20. 



P.G. No particular situation given. One example only. 



A beautiful little species, first discovered during the Stanley 

 Gardiner Expedition to the Laecadive Isles. 



Pecten miniaceus Reeve. 



P,G. Gulf of Oman, Maskat. 10 fathoms, coral-sand. 



Pecten plica L. 



P.G. Gulf of Oman, Ma.skat. 10 fathoms, coral-sand. 

 I. Karachi, not infrequent. 



Pecten pseudolima Sowb. 

 P.G. Koweit, 10 fathoms. 



A vermilion-hued shell, somewhat like a highly-coloured 

 P. varius L. 



Pecten reticulatus Reeve. 



P.G. Gulf of Oman, Maskat. 10 fathoms, coral-sand. 



So far, one example only has occurred. 



Pecten senatorius Gmel. 



P.G. Lat. 26° 10' N., long. 52° 50' E. ; 70 fathoms. Dabai, 

 8 fathoms. These last very brightly-coloured varieties. 

 T. Karachi, not infrequent. ~Bomh&,j {Ahercromhie). 



Pecten singaporinus Sowb. 

 I. Bombay (Abercrombie). 



Pecten thyrideus* Melvill, sp. n. (Plate LV. fig. 10.) 

 P. testa fere rotunda, delicatissinia, alba; valva sinistra paulhdv.m 

 Gonvexa, pidcherrime clathrata, lamellis numerosis concentricis 

 costulisqice circa viginti radianiibios, interstitiis quadratis, 

 fenestratis, Icevibus ; auricidis stihcequalibus ; ixigina interna 

 diaphana, laevigata. 

 Alt. 4, lat. 4, diam. 1-25 mm. {sp. maj.). 



Eab. Persian Gulf : G^^lf of Oman. Lat. 24° 58' N., long. 

 56° 54' E. ; 156 fathoms, shell-sand. 



A most delicate little Pecten, of which all the specimens we have 

 seen are dissociated valves. It is of the same character and 

 alliance as P. clathratus v. Mart.t, from Christmas Harbour, 

 Kerguelen Island (' Challenger ' Expedition), but the radiating ribs 



* Oiipis, el^os, from the latticed cancellations. 



t Sit/.ungsb. d. Gesellsch. iiaturf. Freunde, Berlin, 1881, p. 79. Aho vide 

 Rep. 'Chalfenger' Exp. vol. xiii. p. 305, pi. xxii. tigs. 4, 4«. 



54* 



