932 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [NoV. 29, 



u 2. Pecchiolia susauADRATA ', Jeffreys. (Plate LXX. fig. 3.) 



Shell forming a short oblong, or squarish, very convex, thin, 

 semitransparent, and glossy ; sculpture, numerous but irregular 

 microscopic tubercles, which penetrate the outer layer of the shell ; 

 these are larger iu front and on each side : colour pale yellowish- 

 white : maryms short and rounded on the anterior side, broad and 

 gently curved in front, rounded but somewhat truncated on the 

 posterior side, nearly straight at the back : heaks small, blunt, and 

 slightly incurved ; umbones prominent : lunule short and deep : 

 hhuje-line obtuse-angled : hinge-plate rather thick, considering the 

 texture of the shell : cartilage long, pale 3'ellowish : teeth none : 

 inside polished: scars inconspicuous. L. O'l, B. 0'15. 



'Porcupine' Exp. 1869 : St. 47. 18/0: Ath 16, 17. 



Differs from the young of P. abyssicola in shape and sculpture. 



i/ 3. Pecchiolia iNscuLPTA^ Jeffreys. (Plate LXX. fig. 4.) 



Shell globular, with a square outline, equivalve, very thin, pearly, 

 semitransparent, and glossy : sculpture, about 25 delicate riblets or 

 striee, which radiate from the beak in each valve, besides micro- 

 scopic and numerous concentric striae in the interstices of the riblets, 

 and irregular lines of growth ; the anterior end is smooth : colour 

 white : epidermis membranous, sometimes partially incrusted with 

 mud : margins bluntly angular on the anterior side, nearly straight 

 in front, obliquely sloping or truncated on the posterior side, nearly 

 straight at the back : healcs sunken, small, incurved ; umbones pro- 

 minent : lunide heart-shaped : ossicle white, solid, obliquely tnisted, 

 unequally forked on the broader end towards the posterior side : 

 hinge-plate short, thickened : inside glossy : scars slight. L. 0*25, 

 B. 0-25. 



'Porcupine' Exp. 1869: St. 1, 10, 22. 1870: Med. Off Jijeli 

 (a larger valve). 



Distribution. Bay of Biscay (' Travailleur ' Exp.); S.') 2-645 fms. 

 Palermo {Monterosato) ; 1 62 fms. 



Fossil. Pliocene : Messina {Segiienza, as Verticordia ecostata, 

 and afterwards V. insculpta). 



ir 4. Pecchiolia siNUGSA^ Jeffreys. (Plate LXX. fig. 5.) 



Shell of an irregular shape, but somewhat triangular and sinuous, 

 convex, thin, opaque and lustreless : sculpture, close-set microscopic 

 tubercles arranged in longitudinal rows ; they are easily rubbed off, 

 and then the surface becomes quite smooth and glossy : colour 

 white : epidermis filmy : margins imperfect, but rounded on the 

 anterior side, apparently sloping obliquely in front, nearly straight 

 at the back : leaks very small, incurved : lunule excavated, enclosed 

 by a slight ridge : hinge-plate narrow, twisted, and presenting the 

 appearance of having a short notch or fold under the beak : inside 

 nacreous : scars indistinct. L. 0-3, B. 0-35. 



' Porcupine' Exp. 1870 : Atl. St. 16 (fragments only). 

 ' Squarish. 2 Engraved. ^ FiOl of folds, sinuous. 



