406 ME. r, A. BATHER ON PETAL0CRINTJ8. [Allg. 1 898, 



Specimens belonging to the Walker Museum, and lent me through 

 the kindness of Mr. Stuart Weller, namely : — 



(d) U.C. 4449. Crown and proximal columnal, dorsal view, 



more obscure than PI, XXVI, figs. 38 & 39 ; alongside 

 are remains cf two other arms, dorsal view. (PI. XXYI, 

 fig. 44.) 



(e) U.C. 4449. Single arm-fan, dorsal view, most of dorsal 



surface removed ; facet well shown. 



(f) U.C. 4735. A large slab of silicified rock (37 x 12-16 cm.) 



covered on both sides with remains of Petalocrinus. On 

 the side which the general weathering and lichenous growth 

 show to be the upper, there are two crowns, (f 1) 30 mm. 

 and (f 2) 15 mm. in diameter, and remains of at least 

 nine other arm-fans, all seen from the dorsal surface. The 

 underside contains the remains of at least twelve arm- 

 fans seen from the ventral surface, and four seen from the 

 dorsal surface. There are in the slab various columnals 

 and a few brachials of other crinoid genera, none capable 

 of determination. The mass of the slab is made up of 

 coral-fragments : Halysites^ Favosites, etc. (PI. XXVI, 

 figs. 37, 45-47.) 



Besides these, I have been furnished, through the kindness of 

 Mr. Stuart Weller, with plaster casts of : — 



(g) Cotype. Weller & Davidson, op. cit. pi. vi, fig. 3. A crown 



seen from the dorsal side, the cup not very well preserved. 



Also a photograph of this. (Text-fig. 1, p. 401.) 

 (h) Cotype, Weller & Davidson, op. cit. pi. vi, fig. 4. An arm-fan 



from the dorsal side, with dorsal surface removed, so that 



the floors of the grooves are exposed as rounded ridges, 

 (i) An arm-fan similar to h. 



Finally, there are in the British Museum (Nat. Hist.) : — 



(j) E 6634. Portion of a slab similar to f, containing on one 

 side an arm-fan in dorsal aspect, dorsal surface almost 

 entirely removed and floors of grooves exposed ; and on 

 the other side two fragments of arm-fans similarly pre- 

 served. Presented by Mrs. Davidson. The microsection, 

 text-fig. 2 Cp. 4u4j, was cut from this. 



(k) E 6636. 4rm-fan in siliceous matrix, dorsal aspect. Pre- 

 sentsa by Mr. Stuart Weller. (PI. XXVI, fig. 40.) 



(1) E 6637. Arm-fan in siliceous matrix, ventral aspect. Pre- 

 sented by Mr. Stuart Weller. (PI. XXVI, figs. 51-56.) 



P. longus. — One arm-fan, registered U.C. 4512, preserved in the 

 Walker Museum, and lent by Mr. W^eller, who collected it at 

 St. Paul (Ind.), 1896. The state of preservation appears somewhat 

 similar to that of P. mirabilis, hut the specimen is free from matrix, 

 and apparently silicified throughout. Eather more than the distal 

 right-hand corner is broken away, at an angle similar to that 

 followed by the Grotland specimens when they fracture ; but the 



