240 NOTES ON THE BRITISH JURASSIC BRACHIOPODA. 



of the brachial apparatus, considering it as a most artificial 

 character and of no generic importance. 



He divided the Terebi^tulidas into two groups : the first 

 in which there is no metamorphosis of the loop during life, 

 and where the mantle is furnished with calcareous spicules ; 

 in this group he placed the following genera, Liothyrina, 

 Terehratulina, Megerlea, Kraussina, and Platidia. In the 

 second group the mantle is not furnished with spicules, but 

 the loop undergoes a metamorphosis, or passes through various 

 stages, such as the Platidiform, Magadiform, Milhlfeldtiforvi, 

 ,Terehratelliform, etc. ; in this group he placed Terehratulay 

 ^Waldheimia (Magellama), etc. 



The classification of the Magellanise as proposed by D. P. 

 .Q^hlert of France, may now be considered (16, p. 1317). 

 After giving a few general generic chai'acters of Magellania, 

 this author divides it into two sections, viz., Magellania^ 

 sensu stricto : — Surface plicated (Type.: M. JIavescens, Lam. 

 sp.) ; and Neotliyris, Douville, 1879 : — Valves smooth, non- 

 plicated ; commissure rectilinear (Type : N. lenticnlaris, 

 Desh. sp.). Then quite aside of these two sections he divides 

 the genus Magellania (in the wide sense, which is equivalent 

 to Waldheimia, King), into two sub- genera — Eudesia and 

 Macandrevia — and then proceeds to subdivide Eudesia (which 

 he uses in a much more comprehensive sense than King did, 

 and which he, (Ehlert, considers is equal to the Orthotoma 

 of Qaenstedt, 1871) into a number of sections, as follows : — 



I. Eudesia, sensii stricto. (Flabellothyris, Eag. Desloug- 

 champs, 1884.) (Type : E. cardium, Lam. sp.) 



II. Zeilleria,'Ba,jle, 1878. (Type: Z.cornuta, Sow. sp.) 



III. Fi')nbo'iothyris, Eug. Desl., 1884. (Type : F. guerangerij 

 Desl. sp.) 



IV. Qrnithella, Eug. Desl., 1884. (Type : 0. indentata, 

 Sow. sp.) 



