412 Mr. F. A. Bather on British Fossil Crinoids. 



EXPLANATION OF PLATE XIII. 



Botryocrinus ramostis, sp. n. 



Fig. 1. 57217 B. M. Specimen seen from the posterior. (Nat. size.) 



Fig. 2. The same from the right side. (Nat. size.) 



Fig. 3. An armlet of the same, (x 2.) 



Fig. 4. The left side of the same, showing all exposed. (Nat. size.) 



Botryocrinus decadactylus, sp. n. 



Fig. 5. E 5611, B. M. A young individual, with almost complete stem. 



(Nat. size.) 

 Fig. 6. E 1328, B. M. Specimen seen from posterior, the arms dissected 



away and the ventral sac exposed. (Nat. size.) 

 Fig. 7. 48101, B.- M. Plates of the ventral sac from the proximal anterior 



region. (X 7.) 

 Fig. 8. 57225, B. M. Part of one specimen to show tegminal plates and 



covering-plates, (x 3.) 

 Fig. 9. 136, Holcroft. Pinnules showing covering-plates. ( X 9.) 

 Fig. 10. E 5130. Distal surface of first costal. ( x 5.) 

 Fig.W. The same. Articular surface of stem-ossicle. (X 5.) 

 Fig. 12. 349, Holcroft. Proximal part of stem, (x 4.) 

 Fig. 13. a/495, Cambridge, Fletcher Collection. Specimen showing a 



branched proximal pinnule; labelled " Oyathocrinus quindeci- 



malis (Salter, MS.)." From a drawing by Mr. Edwin Wilson, 



artist of the Cambridge Engraving Co. (Nat. size.) 

 Fig. 14. ff/494, Cambridge, Fletcher Collection. Specimen with stout, 



square-sided pinnules. From a drawing by Mr. Edwin Wilson. 



(Nat. size.) 

 Fig. 15. E 1419, B. M. Specimen seen from posterior. (Nat. size.) 



Botryocrinus pinnulatus, sp. n. 

 Fig. 16. Specimen in Dudley Museum ; seen from posterior. (Nat. size.) 



Note to p. 410. Relations of B. pinnulatus: — My friend 

 Mr. Madeley thinks that u the Upper Limestone (Wenlock) 

 of Dudley was a deep-water formation, deposited in deeper 

 water than the underlying shale," and " that the Lower bed 

 of limestone was not formed in water so deep as the Upper 

 Limestone." Mr. Madeley, further, is " inclined to consider 

 theblueish mudstone lying on the top of the Upper Limestone 

 at Dudley as a deep-water formation (1) from the uniform 

 fineness of the particles throughout a considerable thickness, 

 (2) from the paucity of the concretionary pebbles of argilla- 

 ceous limestone scattered therein, (3) from the limited 

 character of the fossils from classes to species, and (4) from 

 the paucity of the fossils themselves ; in all of which con- 

 ditions it is in marked contrast with the shale lying between 

 the Upper and Lower Limestones." " The overlying shale 

 is not dissimilar in texture &c. from those thin seams of shale 

 intercalated in the Upper Limestone, from which so many 



