THE MOLLTJSCA OF TORRES STRAITS. 205 



mollusc, evidently of wide distribution, ranging from the mid- 

 Atlantic Ocean to Sicilian localities in the Mediterranean. 



" Pholadomya Loveni, Jeffreys, Proc. Zool. Soc. 1881 

 ('Lightning' and 'Porcupine' Esped., 1868-70), p. 934, 

 pi. Ixx. fig. 7. 



" Shell inequilateral, wedge-shaped, gaping at the posterior 

 end, convex, of a pearly nature, partly semi-transparent, lustre- 

 less; sculpture, 10-12 longitudinal ribs, besides some iatermediate 

 striae ; these are more or less interrupted by strong periodical 

 marks of growth, so as to give the ribs a nodulous appearance ; 

 the sides are ribless ; the whole surface is covered with minute 

 prickly tubercles ; colour white ; margins rounded on the anterior 

 side, inclining upwards towards the other side, which is also 

 rounded but slightly truncate, sloping at the back from eacK 

 side of the umbo ; heaJcs bluntly triangular, turned inwards ; 

 umbones prominent ; ligatnental pit in the right valve obtuse- 

 angled, placed outside underneath the beak, and defined outwards 

 by a thin plate ; hinge-line sloping towards the posterior side ; 

 hinge-plate thin, sinuous, reflected ; teeth none ; inside highly 

 glossy and nacreous ; scars conspicuous. L. 0"4!, B. 0*5. 



" ' Porcupine ' Exped. 1870 ; Atl. St. 22, 28 a ; Med. 55. 



" None of the specimens are quite perfect. One of them 

 indicates twice the size given in the description. That figured is 

 from the ' Josephine ' Expedition. 



" Dist. Palermo, frequent (Monterosato), 162 fathoms. Off 

 Marseilles (' Travailleur ' Exped, 1881) ; Villa Eranca, Azores 

 (' Josephine ' Exped.), 320-600 fathoms."— J", a. J. 



Into the two groups proposed by Meek we are unable precisely 

 to allocate the P. Haddoni. To this, indeed, we can find nothing 

 near akin, unless an obscure species described by Mr. Bullen 

 Newton in 1892*, as occurring in the Upper Keuper Sandstone, 

 Sbrewley, Warwickshire, prove its ally. Certainly from figure 

 and description it appears analogous, particularly as to being 

 nearly equilateral, with radiately ribbed surface, these ribs, how- 

 ever, being far more pronounced. It was provisionally named 

 Pholadomya (?) Bichardsii, after Mr. E. P. Eichards, the dis- 

 coverer. 



From the difi"erentiation we have given above, and which need 

 not be recapitulated, we plead justification for the creation of a 



* J. of Conch, vii. p. 411, fig. 2 (1894). 



