644 DR. G. J. HINDE AND MR. HOWARD FOX ON [Nov. 1 89 5, 



structure of these fossils has been wholly removed, and they are now 

 preserved as casts in the soft siliceous matrix ; but the casts, as a 

 rule, retain very sharp and distinct impressions of the different 

 forms. 



(a) Sponges. 



The only remains of sponges found are microscopic fragments of 

 the long needle-like spicules which form the anchoring-wisps of 

 hexactinellid sponges, and an occasional cruciform spicule of the 

 same group. The fragments are in the same condition of preserva- 

 tion as the radiolaria in the same beds ; they are not very abundant, 

 but have been recognized at Codden Hill, Hannaford, and Temple- 

 ton near Barnstaple ; at Hulverton, North Devon ; Eamshorn 

 Down, hedge-section at Lawell House, Winstow Cottage, near 

 Chudleigh, and at Landlake near Launceston. 



(b) Corals. 



Pleurodictyum Dechenianum, Kayser. PI. XXVIII. figs. 18, 18 a, 

 186. 



1882. Jahrb. der konigl. Preussisck. geol. Landesanst. f. 1881, p. 84, pi. iii. figs. 20, 

 21. 



This form is at present known only from casts ; it seems to have 

 been hemispherical or semioval, the base flattened or slightly con- 

 cave ; the corallites are conical, either round or subprismatic in 

 transverse section, and connected with each other by small rods 

 (the solid infillings of the pores) disposed in vertical rows. There 

 are from eight to ten rows in a single corallite. No traces of 

 tabulae or septal spines are present, nor is there any coiled tube as 

 in P. problematicum. 



The corallum is very diminutive ; the base of a small specimen is 

 only 5 mm., and the largest noted only 12 mm. across ; the height 

 of the coral appears to have been a little more than the basal width. 

 The corallites range from 2 to 5 mm. in length, by "7 to 2 mm. in 

 width at the summit. 



The forms are not infrequent in yellowish shales at Hannaford 

 Quarry, near Barnstaple. Kayser's specimens were from the Culm 

 kieselschiefer at Aprath, between Elberfeld and Wiilfrath, Rhenish 

 Prussia. 



Cladochonus Michelini, M.-Edwards & Haime. PI. XXVIII. 

 figs. 19 & 19 or. 



1851. Pyrgia Michelini, M.-Ed. & Haime, 'Polyp, foss. Terrains paleoz.' p. 310, 

 pi. xvii. fig. 8. 



1872. Cladochonus , de Koninck, ' Nouv. Recherck. Anim. foss. terr. carbon. 



Belg.' p. 153, pi. xv. fig. 6. 



1879. , Nickolson & Etkeridge, Jun., Geol. Mag. p. 292. 



1882. , Kayser, Jakrb. konigl. Preuss. geol. Landesanst. f. 1881, p. 85, 



pi. iii. fig. 19. 



1889. , Holzapfel, Pal. Abbandl. n. s. vol. i. (1889) p. 69. 



The only example met with of this species is a very perfect cast 

 of a single cup and pedicel, which together are 15 mm. in length. 

 The pedicel is ]0 mm. in length and 1 mm. in thickness near the 



