322 Miscellanea, 



This species is slightly allied to the Lpplcsna lepis of the Kifel, 

 and the L. membmnacea and L. mesoloba (Phil. Pal. Foss.), but is 

 distinguished fiom the two first by its gibbose quadrangular form, 

 concave front, and large tumid ])eak ; and from the latter by its 

 want of mesial ridge and spines, and by the fine transverse plication 

 of the surface. Length 7 lines, width 10 lines. 



Rare in the sandstone of Loder's Creek, N. S. Wales, 



Leplcena ? 



A species closely resembling the L. Hardrensis (Phil.), but more 

 square in outline, not so wide, and more coarsely striated, is common 

 in the shale of Dunvegan, N. S. Wales; it also resembles the 

 Chonites Laguesiamis of the Belgian carb. shale and the Ghanites 

 Fa/^/a?ir/Jca of the Falkland Islands; but as I have not examined 

 either of those latter species, 1 prefer leaving the determination 

 of the Australian form uncertain. 



Orbicula affinis (M'Coy). PL XIII. fig. 1. 

 Sp. Char. Longitudinally ovate, very much depressed ; margin 



slightly undulated ; apex acute, excentric towards the right side, 



one-third of the length from the anterior edge ; surface with fine, 



sharp, irregular concentric plicae. 



This is only to be distinguished from the Orbicula Davreuxiann, 

 (Kon.) of the Tournay carb. shale by the fine, sharp, concentric 

 plication of the surface. Length 3 lines, width 2^ lines, height 

 thi'ee-fourths of a line. 



From the shale of Dunvegan, N. S. Wales. 



(Lamellibranchiata.) ~" 



Pecteu squamuliferus (Mor.). 



Common in the fine, olive-coloured schists of Wollongong, 

 N. S. Wales. 



Pecten pti/chotis (M'Coy). PI. XIV. fig. 2. 



Sp. Char. Ovato-orbicular, width very slightly exceeding the length, 

 convex, smooth; ears unequal, posterior one obtuse-angled, 

 undefined, anterior ear narrow, square at its extremity, divided 

 by a deep, acutely angular sinus, from the body of the shell ; surface 

 smooth, except the extremity of the anterior ear, which is longi- 

 tudinally plicated. 

 It is only by the plication of the extremity of the anterior ear 



that this can be known from the P. variabilis (M'Coy) so abundant 



in some of the carboniferous shales of Ireland. Length 4 lines, 



width one-fourth of a line more. 



Common in the shale of Dunvegan, N. S. Wales. 



Pecten sub-b-lineatns (M'Coy). PI. XYII. fig. I. 



Sp. Char. Truncato-orbicular, convex, equilateral, beaks tumid ; 

 ears large, nearly equal, flattened, the posterior one slightly 

 pointed and separated at the margin from the body of the shell 

 by a deep rounded sinus ; anterior ear broad, nearly square, 

 with a slightly convex margin ; surface of both ears and body 

 of the shell marked with a few obtuse concentric waves of growth, 

 and radiated with rather coarse naiTow rounded ridges, those of 



