REPORT ON THE LAMELLIBRANCHIATA. 303 



Pecten murrayi, n. sp. (PI. XXII. figs. I -la). 



Testa iiTogulariter cireularis, comprcssa, tonuissimi), subliyalina, insequivalvis, sordide 

 albida. Valva dextra fere plana, incrementi lineis toiuiil)Us striata, sinisti'a jjaulo convexa, 

 liris numerosis regularibus conceutricis tenuissimis instructa. Auriculae valvae sinistrae 

 fere sequales, postica latere posteriori coutiuua ; antica valvse dextrse parva, inferne 

 mediocriter profunde sinuata, sinu callo teuui iuduto. Pagina interna nitida. 



Length 15 J mm., height 14|^, diameter 2. 



Habitat. — Station 184, east of Cape York, North Australia, in 1400 fathoms. 



In this very flat species the hinge-line occupies about two-fifths of the whole length 

 of the shell. The valves are difi'erently sculptured, the concentric lirse of the deeper or 

 left one lieiug stronger than those in the right. In this, in addition to the concentric 

 sculpture, minute interrupted lines which radiate from the apex are discernible under the 

 microscope, and within it is slightly nacreous. 



Pecten vitreus (Chemnitz). 



Pallium viireum, var. papi/raceiim, Chemnitz,' Conch. -Cab., vol. vii. pp. 267, 335, pi. Ixvii. 



fig. 637a. 

 Palliuin vitrcum, Schrdter, vp. cit, Index, p. 78. 

 Peden vitrexis, Philippi, Abhaudl., vol. i. p. 203, pi. ii. fig. 3. 

 Pecten vitreus, Jeffreys, Brit. Conch., vol. v. p. 168, pi. xcix. fig. 6. 

 Peden vitrens, Sars, Moll. Reg. Arot. Norv., p. 21, pi. ii. figs. 5a, 5b. 



Habitat.— Stations 307, 308, 310, and 311, all off the west side of Southern 

 Patagonia, in 140 to 400 fathoms; Station 232, South Japan, in 345 fathoms; and 

 Stations 204, 207, and 209, all off the Philippine Islands, in 100 to 700 fathoms. 



The specimens from Stations 307 to 311 have already been associated with this 

 species by Jeffreys, and although I have only had an opportunity of comparing them 

 with two northern examples, there seems also, judging by the descriptions and figures, 

 no reason for questioning the identification. The mantle is finely papillose, and furnished 

 with minute black-ringed ocelli. Pecten fragilis, an allied form, is said by Friele to be 

 devoid of this characteristic. 



These Patagonian specimens appear to be quite t}"pical examples of the species. 

 Having the same form and the surface covered more or less with the interrupted rows of 

 scales. The single example from South Japan has very little of this squamate character, 

 being only about half-grown, but in foi-m and the microscopic sculpture agrees perfectly 

 with the normal tj^pe of the species. Pecten vitreus, King (Zool. Journ., vol. v.), from 

 Patagonia, is a totally different shell. 



The shells from the Philippine Islands have very numerous rows of scales which ai-e 

 rather longer than in other specimens of this species which I have examined. 



