318 Miscellanea . 



MOLLUSCA. 

 {Brnchiopoda.) 

 Atrypa cymbeeformis (Mor.). 

 Very common in the sandstone of Muree, N. S. Wales, and in 

 the impure limestone of Black Head, N. S. Wales. 



Atnjpa bnmdata (M'Coy). PL XIII. figs. 9 & 9 «. 

 Sp. Char. Longitudinally ovate, gibbose, smooth ; front narrow ; 

 margin raised in two rounded waves, from which two obsolete 

 rounded ridges extend a short way towards the beak on the 

 ventral valve, and one obscure rounded mesial ridge extends 

 nearl}^ to the beak on the dorsal valve. 



This species closely resembles the A. hastata (Sow.) of the 

 British Mountain Limestone, and may have been confounded with 

 it ; it is, however, perfectly well distinguished by the character of 

 the front margin, which in A. hastata is straight and even, but is 

 elevated and bent into a double fold in the Australian species, 

 somewhat as in the less exaggerated varieties of the Terebratula 

 hiplicata (Sow.) of the oolites (from which it is known by its 

 imperforate beak, &c.) ; also both valves of the A. hastata are 

 plano-concave towards the front margin, while the dorsal valve of 

 the present species presents an obtuse mesial convexity. Length 

 1 inch I line, width 10 lines, thickness 7 lines. 



Common in the dark limestone of Black Head, N. S. Wales, in 

 the coarse conglomerate of Korinda, N. S. Wales, and in the gray 

 schists of Leuin's Brook, N. S. Wales. 



Atrypa Jukesii (M'Coy). PI. XIII. fig. 8. 

 Sp. Char. Transversely oval, length two-thirds the width ; sides 



with eight or nine large, acutely angular, simple plaits, extending 



from the beak to the margin, which they deeplj^ indent ; mesial 



elevation moderate, square, of five slightly angular simple plaits, 



much smaller than those of the sides. 



This species is closely allied to the A. pleurodon (Phil.) of the 

 carb. limestone of Britain, and the A. fallux (Sow.) of the upper 

 Devonian and lower carboniferous shales of England and Ireland, 

 but is distinguished by the dissimilarity in size and angulation 

 between the mesial and lateral plaits; the mesial plaits are, if 

 anything, a little larger than those of the sides in the British forms 

 alluded to. Length 4i lines, width 7 lines. 



Common in the Dunvegan shale. 



I have dedicated this species to my friend Mr. Jukes, who has 

 geologically examined a considerable portion of the country and 

 collected many fossils, which I have not as yet seen. 



Spirifera {Eeticularia) crebristria (Mor.). 

 This species has got a distinct cardinal area, and could not there- 

 fore belong either to Terebratula or Atliyris, as suggested by Mr. 

 Morris ; it is, in fact, a typical exami)le of that little group of 

 Spirifcrs for which I have suggested the name Reticularia in the 

 ' Synop. Carb. Foss.' &c., distinguished by their small size, area 

 and hinge-line as in Martinia (M'Coy), (that is, the former shorter 



