112 



G. E. VINE ON PHTLLOPOEA AND THAMNISCITS FEOM THE 



and by Mr. Shrubsole * as Thamniscus crassus, from the Wenlock 

 Shales and Dudley Limestone. 



Referring again to Prof. Nicholson's paper on " New Palaeozoic 

 Polyzoa " (op. cit.), I wish to draw attention to two of his figures, 

 because these have some resemblance to the present species. Of 

 figs. 3 and 3 a in pi. ii. the author says (explanation of pi. op. cit. p. 5), 

 " Fig. 3. — Fenestella Davidsoni, a small portion of the non-poriferous 

 side of the natural size. Pig. 3 a. — Portion of the same enlarged." 

 Both these figures appear to me to be portions of a free-branching 

 Thamniscus. There are no fenestrules or dissepiments. Figs. 3 h 

 and 3 c of the same plate, " portions of the poriferous side of another 

 specimen " (Nich.), belong, so far as 1 can judge from the figures, 

 to a different species, apparently a true Fenestella. I know Prof. 

 ISTicholson will receive my remarks in the spirit in which they are 

 offered ; my only desire in criticizing his labours is to bring out all 

 the information that is possible in describing forms still older than, 

 but apparently generically related to, the Hamilton species described 

 as Fenestella Davidsoni by Nicholson. 



Eange of Lower-Silurian FliyUoporm. 



1. PhyJlopora. Lower Llandeilo. Cat. p. 20t. 



2. Hisingeri, M'^Coy. Caradoc. Cat. p. 44. Prom several 



localities. 



3. ornata, MS. (Wyatt-Edgell). Caradoc. Cat. p. 44. 



4. ' tumida, Yine. Caradoc (fig. 1, above). 



5. variolata, Ulrich. Cincinnati Group. 



6. clathrata, Miller and Dyer. Cincinnati Group. 



7. trentonensis, Nicholson. Trenton, L. Ontario. 



8. sp., Lower Llandovery. Cat. p. 64. 



I give the whole of the forms known to me ; but I would advise 

 the examination especially of those numbered 1, 3, and 8, in the 

 above list. The Upper Silurian PhylloporcB merit full description 

 and illustration ; but unhappily the really good specimens are not in 

 my keeping, although ample material is in existence in the cabinets 

 of others for the purpose suggested. 



Lower and Upper Silurian THAMNiscroiE. 



1. Thamniscus antiquiis, Yine. Age ?, Bala beds (fig. 2, above). 



2. crassus, Lonsdale. Wenlock Shale, Dudley Limestone. 



3. variolata., Hall. Lower HelderbergJ. 



4. nysa^ Hall. Lower Helderberg. 



5. ni/sa, variety, Hall. Lower Helderberg. 



6. fruticella, Hall. Lower Helderberg. 



7. ? cisseis, Hall. Lower Helderberg. 



* Quart. Jotirn. Geol. Soc. vol. xxxviii. p. 344. 

 t Mus. Pract. GeoL Catalogue. Silurian fossils, 1878. 

 I Corals and Eryozoans of the Lower-Helderberg group, by James Hall. 

 Albany, 1880, pp. 37 & 38. 



