Miscellanea. 393 



the ears being close and equal, while those of the body are rather 

 distant from each other, the interspaces being flat ; about twenty- 

 five proceeding directly from the beak to the margin, where they 

 are about twolines apart; between those at a short distance from 

 . the beak are interpolated an equal number of rather thiimer ones, 

 which again receive nearer the margin two tine striee between 

 each of them and the adjoining primary ridge. 



The striation of this fine species resembles that of the P. quin- 

 quelineatus (M'Coy, Syn. Carb. L. Foss.) ; that is to say, near the 

 margin and towards the middle of the shell there are five striae 

 between each pair of primary ones, the middle or odd one of the 

 five nearly equalling the primary ridges in tliickness. The present 

 fossil -has, however, much finer strice than the Irish species alluded 

 to, and the arrangement is mucli less definite, becoming confused 

 in size and number towards the sides ; it is also distinguished by 

 its greater convexity. Length 2 inches 9 lines, width the same. 



Rare in the greenish, fine sandy beds of Harper's Hill, N. S. 

 Wales. 



Avicula tessellata (Phil.). 



I cannot distinguish the specimens occurring in the soft greenish 

 schists of Dunvegan, N. S. Wales, from those in the precisely 

 similar shale at the base of the carboniferous series at Lisnapaste, 

 in the north of Ireland. 



Pierinea macroptera (Mor.). 

 Rare in the white rock of Port Arthur, V. D. Land. 



Eurijdesma corclata (Mor.). 

 Common in the arenaceous limestone of Arthur's Hill, N, S. Wales. 

 Inoceramus Mitchelil (M'Coy). PI. XIV. fig. 1. 



Sp. Char. Longitudinally ovate, one-fifth longer than wide, slightly 

 oblique, inflated; hinge-line oblique, nearly equalling the width 

 of the shell, forming a slightly compressed wing ; beaks pointed, 

 prominent, incurved, close to the anterior end; anterior side nearly 

 straight, abruptly subtruncate ; surface v/ith numerous strong, 

 concentric, irregular wrinkles of growth. 



The hinge margin of this species is much thickened, which 

 removes it from Posidonia, while, as in many of the German cre- 

 taceous Inocerami, it is not possible to observe any traces of the 

 transverse ligamentary pits, nor can we be sure whether those 

 species possessed them or not ; meanwhile I shall leave the present 

 species in the same genus as its obvious allies alluded to ; and even 

 if future research should prove that ligamentary pits did not exist, 

 we should form a distinct genus for those species, which, like the 

 present and the I. veiustus (Sow.) of the mountain limestone, are 

 distinguished from the true semimembranous Posidonia; of the lias 

 and palseozoic shales with which they have been confounded, by 

 their thick shells, general form, and thickened hinge-margin. 

 Length 2 inches 3 lines, width 1 inch 9 Imes, thickness about 

 H inches. 



Conimon in the sandstones of Glendon and WoUongong, N. S. 

 Wales. 



2d 



