Y. 548 F. A. Bather — Studies in Edrioasteroidea. 



e. "Wax squeeze of the same ; showing pores and flooring-plates of the groove 



as they would appear on the inside of the test. 

 /. Similar squeeze from a part of the groove nearer the periphery, showing 

 the twisting over of the flooring-plates. 

 Fig. 3 (E 7,583). Actinal surface ; the crack running from N.E. to S.W. shows the 

 fracture that enabled the transverse section, Diagram 2, to be reconstructed. 

 Fig. 4 (E 7,584). Abactinal surface ; shows imbrication of peripheral area, and 

 traces of the frame. 



Fig. 5 (E 7,585). Actinal surface; the pentagonal area at the actinal pole is well 

 marked, owing to the breaking away. of the portion of the cast that 

 represented the covering -plates. 

 Fig. 6 (E 7,586). a. Actinal surface. 



b. Abactinal surface ; shows large central hollow and traces of frame. 

 Fig. 7 (E 7,587). a. Actinal surface ; the line x — y is that of the section b ; this 

 latter shows the trace of the frame in the left half. 

 c Portion of abactinal surface of specimen, showing marked trace of the frame. 

 d. Wax squeeze from impression of same in matrix, therefore representing 

 outside of test ; shows imbricating plates more distinctly, but trace of 

 frame far less distinctly. 



NOTE ON DINOCYSTIS BAEROISI. 

 [Geol. Mag., n.s., Dec. IV, Vol. VI, p. 94 ; Feb., 1899.] 



Sir, — Please allow me a few words in reply to the valuable paper 

 of Mr. F. A. Bather on Dinocystis Barroisi. 1 In his paper " Sur 

 l'etage devonien des psammites du Condroz en Condroz" (Bull. Acad, 

 des Sci. de Belg., 1875, 2 e ser., t. xxxix, pp. 658-9), Mr. M. Mourlon 

 mentions, from Mr. Malaise's collection, an " asterie " found near 

 Walcourt in an indeterminate " assise" of the " psammites du 

 Condroz." This fossil is no longer quoted in the list of the fossils 

 of this series, given by the same author in his " Geologie de la 

 Belgique," but it is replaced (t. ii, p ; 23) by Agelacrinus, very rare, 

 in the "assises" of Montford and Evieux, the two upper assises of 

 our Psammites du Condroz, and this is supposed by Mr. Bather to be 

 the same as his Dinocystis Barroisi. Now the " asterie " of 1875 

 is the species found by Mr. L. Bayet, and described by me in my 

 " Fragments paleontologiques " (Ann. Soc. geol. de Belg., 1881, 

 t. viii, Mem., pp. 52-54, pi. iii, figs. 1 et 2), under the name of 

 Protaster Decheni, and for important reasons I believe that the 

 Agelacrinus of 1881 is the same species. Kecently, I have learned 

 from Mr. L. Bayet that his fossil was found in the " assise 

 d'Evieux." G. Dewalqub. 



Liege, January 9, 1899. 



1 See Geol. Mag., Dec. IV, Vol. V, December, 1898, p. 543. 



