NOTES ON THE BKITISH JUKASSIC BEACHIOPODA. 243 



Douville, Deslongchamps, and others ; but was rejected by 

 Davidson, whilst Q^hlert makes it a section of his Magellania. 



Deslongchamps divided his Zeilleria into one sub-genus, 

 Meganteris, Suess, which is represented in the Silurian and 

 Carboniferous deposits, and 13 sections, of which six are 

 named ; the other sections are represented by letters only, 

 A, B, C, etc. 



It should be borne in mind that Deslongchamps expressly 

 stated that he did not consider his groups of the Zeillerim as 

 being of generic value. 



Not having had access to Bayle's diagnosis of his Zeilleria^ 

 and in the absence of a diagnosis by (Ehlert of his section 

 Zeilleria, it is necessary to quote Deslongchamps, who in his 

 section A describes the special group to which Z. cornuta, the 

 type of Bayle's genus Zeilleria, belongs. His description is 

 as follows : " This section is characterized by a very strongly 

 carinated beak, small foramen, shell slightly swollen, with 

 the frontal region bilobed or quadrilobed. Met with chiefly 

 in the Lias." Examples : — Z. quadrifida, Lam. sp., Z. cor- 

 nuta, Sow. sp. (12, p. 271). 



Splendid specimens of the above have been met with in 

 the Ilminster and South Petherton district. 



If (Ehlert be followed, it would appear to be necessary to 

 retain in this section, for the present, a large number of our 

 Jurassic species, such as subnumismalis, lycetti, perforata^ 

 digona, ohovata and its varieties, vicinalis, etc., etc., 



Ornithella, Eug. Deslongchamps, 1884. 



(Type : 0. indentata, Sow. sp.) 



Etym. — Diminutive of opi/ts, a bird. 



In this section the beak is recurved, and slightly carinated. 

 Foramen small or very small. Form elongated, globose ; 



