30 



SUPPLEMENT TO THE 



which Mr. Glass has developed. Each spiral is formed of seven or eight convolutions. 

 It is also said to occur at the Dock Yard, Plymouth.^ 



Genus — Uncites, Befrance, 1828. 



17. Uncites gryphus, Schloth., sp. 



Dav., Dev. Mon., PL IV, figs. 11, 12; and Dev. 

 Sup., PI. Ill, figs. 4 to 10. 



Uncites gryphus, Schloth. Dav., Geol. Mag., New Series, vol. viii, p. 145, 1881. 



' Eor many years past I have been on the look out for specimens that would clear up 

 the interior characters of Defrance's genus. In 1853, in the General Introduction of my 

 work on ' British Eossil Brachiopoda,' I described and figured part of the interior of the 

 dorsal valve of Uncites gryjjhus, showing the lateral pouch-shaped cavities opening 



exteriorly, as well as the attach- 

 ments to the hinge-plate of the 

 principal stems of the spiral appen- 

 dages ; also indications of the spiral 

 appendages from a specimen which 

 Prof. Beyrich, of Berlin, was so for- 

 tunate as to discover at PafFrath, 

 and which was brought to my notice 

 by Prof. E. Suess, of Vienna. 



In 1871 Prof. Quenstedt, in pi. 

 43 of the atlas of his ' Die Brachio- 

 poden ' (Petrefactenkunde Deutsch- 

 lands), figures spiral coils in a speci- 

 men of Uncifes. No one, as far as 

 I am aware of, seems, prior to the 

 notice I inserted in the Geological 

 Magazine' for April, 1881, to have figured or described the mode in which the spirals 



Uncites gryphus, Defrance. 

 Specimen in tlie Imperial Museum of Vienna. 2. Restored 

 interior of the dorsal valve, a. Cardinal process, b. Principal 

 stems of spirals, c. Connecting lamellaj. e. Pouch-sbaped 

 expansions. From Nismes, near Couven, Belgium. 



1 By Dock Yard is meant " Devonport," which by the dwellers at Plymouth was called " Dock Yard," 

 and by those at a distance " Plymouth Dock," until 1824. It is now a distinct municipal and parliamen- 

 tary borough. On the old labels attached to specimens in the Plymouth Institution the word " Dock 

 Yard " is written, and therefore here reproduced. 



