Vol. 62.] LIMESTONE OP THE MENDIP AREA.. 377 



Internal characters. — Pedicle-valve (text-fig. 2, p. 376) : 

 Dental plates large, converging and forming a spondylium, which 

 extends throughout half the length of the valve. The crest of the 

 spondylium is fused with the bottom of the valve throughout the 

 greater part of its length; but anteriorly it is united to the valve by 

 a low, strong mesial septum, which does not extend far beyond the 

 anterior end of the spondylium. 



Brachial valve: Mesial septum and cardinal process well- 

 developed. 



EXPLANATION OF PLATES XXXI-XXXV. 



Plate XXXI. 



[All the figured specimens are preserved in the Author's collection.] 



Pig. 1. A Caninoid Cyathophyllum (p. 367). Horizontal section ; xl*17. 



Syringothyris-Zone; Vallis-Vale section, near Frome (Somerset). 

 Figs. 2 a & 2b. Campophyllum caninoides, sp. nov. (p. 368). 

 Fig. 2 a. Horizontal section ; natural size. 



Upper Syringothyris-Zone, Leigh-upon-Mendip (Somerset). 

 Fig. 2 b. Horizontal section ; X 116. 



LTpper Syringothyris-Zone ; Stoke Lane (Somerset). 

 Fig. 3. A Campophyllid (p. 369). Horizontal section ; Xl'18. 



D subzone ; Etnborough (Somerset). 

 Fig. 4. Carcinophyllum mendipense, sp. nov. (p. 369). Horizontal section ; 

 X P22. 



Base of Seminula-Zone ; Milton-Road Quarries, Weston-super- 

 Mare (Somerset). 

 Figs. 5 a & 5 b. Cyathophylloid Clisiophyllids (p. 370). 

 Fig. 5 a. Horizontal section ; X 1'2. 



S t subzone ; Vallis-Vale section, near Frome (Somerset). 

 Fig. 5 b. Horizontal section ; X 1*5. 



S x subzone ; Holwell (Somerset). 



Plate XXXII. 



[All the figured specimens, with one exception, are preserved 

 m the Author's collection.] 



Figs, la & lb. Athyris (Actinoconchus) cf. lamellosa (L'Eveille) (p. 374). 

 K 2 subzone ; Maesbury railway- section (Somerset). 

 Fig. 1 a. Pedicle-valve; xl'08. 



Fig. 1 b. Another specimen. Brachial valve ; natural size. 

 Fig. 2. Productus <p (p. 372). Convex valve ; natural size. 

 D 2 subzone ; Emborough (Somerset). 



Figs. 3a & 3b. Productus concinnus (Sow), mut. D 2 (p. 372). Convex valve ; 

 natural size. 

 D 2 subzone ; Emborough (Somerset). 

 Fig. 4. Productus sp., convergent with Pr. murgaritaceus, Phil. (p. 373). 

 Convex valve ; natural size. 



D 2 subzone ; Ebbor Valley, near Wells (Somerset). 

 Figs. 5 a-o c. Camaropkoria isorhyncha (M'Coy) (p. 376). Base of Seminula- 

 Zone ; Cheddar-Gorge section (Somerset). 

 Fig. 5 a. Brachial valve ; natural size. 

 Figs. 5 b & 5 c. Another specimen (A. Vaughan Coll.). 

 5 b. Side view of both valves ; natural size. 

 5 c. Pedicle-valve : natural size. 



