130 



SUPPLEMENT TO THE 



Genus — Hindella, Dav., 18S2. 



Type Athyris urn 



, Billings. 



Shell elongate ovate; spiral cones have their apices directed towards the lateral 

 margins of the shell. There are about six coils in each spiral. The two principal 

 stems of the spiral cones are attached to the hinge-plate, 

 and after extending a little way into the interior of the 

 shell between the spirals they are suddenly bent back- 

 wards towards the hinge. They then form a broad 

 rounded curve, facing the bottom of the dorsal valve ; the 

 curve being very gentle, so that the two primary lamellae 

 on the dorsal side seem almost Hke parallel lines. When 

 the primary lamellae reach the front they give off a semi- 

 circular band or loop having a projection or spike-like 

 process at the top of it. This loop is directed upwards 

 towards the beak, and is almost immediately behind the 

 two primary lamellae on the dorsal side of the spirals. The 

 loop is therefore internal to the spirals, and the whole 

 spiral arrangement places this genus under the group 



NUCLEOSPIRID^. 



I have named it after Dr. George J. Hinde, E.G.S., in recognition of the services he 

 has rendered to the science of palasontology. 



Hindella umbonata, Bill., sp. In- 

 terior of dorsal valve, showing^ spi- 

 rals, attachments to hinge-plate, and 

 loop. A portion of the fii'st "coil of 

 each spiral cone has been removed 

 so as to show the loop between spiral 

 cones. Anticosti group. Developed 

 by the Rev. N. Glass. 



Hindella umbonata, Billings, sp. 



Athyhis umbonata, Billings. 



Me HI STELLA 



Miller. 



Geol. Survey of Canada ; vol. i j Palaeozoic Fossils, 



p. 144, fig. 121, 1865. 

 List of the Bracbiopoda from the Island of Anticosti ; 



BuUetiu of the Museum of Comparative Zoology, 



Cambridge, Massachusetts, p. 69, 1865. 

 The American Palaeozoic Fossils : A Catalogue of the 



Genera and Species, &c., p. 116, 1877. 



Elongate ovate, longer than wide. Ventral valve stron: 



;ly convex, with a slight 



longitudinal depression along the middle ; beak much incurved. Dorsal valve very convex, 



