On the so-called " Farringdon (Coral-Rag) Sponges." 431 



In the Utica or Hudson-River Shales of Lake St. John, 

 Lower Canada*, occur 



Leptograptus flaccidus, Hall. Diplograptus quadrimucronatus, 



Diplograptus mucronatus ?, Hall. Hall. 



Retiograptus ? eucharis, Hall. 



From the Lorraine Shales of New York Professor Hall 

 figures 



Ampbigraptus divergens, Hall. Diplograptu.-i hudsonicus, Nich. 



and some other species f. 



In the corresponding beds near Montreal occur Climaco- 

 graptus bicorm's, Hall, Diplograptus fbliaceus, Murch., and 

 Dicranograptus Nicholsoni, Hopk.J. 



L. — Note on the so-called u Far ring don [Coral-Rag) Sponges " 

 (Calcispongue, Zittel). By H. J. Carter, F.R.S. &'c. 



A few days ago, while turning out the contents of a box, I 

 found a parcel of fossils labelled " Coral Rag," and, on opening 

 it, not only saw that it contained several beautiful specimens 

 of the so-called " Farringdon sponges," but recollected that 

 these fossils had been given to me by a dear fellow student 

 who lived at or near Farringdon in Berkshire, and whose un- 

 timely decease, somewhere about forty years ago, was about 

 coeval with the present ; thus the parcel seems to have been 

 unopened for this lapse of time. 



At once I observed that the Farringdon sponges belonged 

 to the Order called by Professor Zittel, in his " Studies on 

 Fossil Sponges "§, " Calcispongia3," which were first brought 

 to my notice by his kindness in not only sending me entire 

 specimens of these sponges themselves from the " Upper Jura, 

 &c," but slides of Peronella multidigitata and P. cylindrica 

 respectively — showing that these, at least, contained triradiate 

 spicules which, in the former, to me as well as to himself, 

 seemed to be identifiable only with those of a recent Calci- 

 sponge. 



* Hall, Grapt. Quebec Group, pp. 143 &c. 



t Hall, Grapt. Quebec Group, p. 13 ; Paleontology New York, 

 vol. i. pi. 72. 



\ Logan, ' Geology of Canada,' p. 200. 



§ Abhandlungen der k. bayer. Akad. der Wiss. ii. CI. Band xiii., 1S77. 

 I. Hexactinellidse ; lb. ib. Abth. i. pp. 67-1.54, II. Lithistidie ; lb. ib. 

 pp. 93-138, III. Monactinellid.-ie, Tetractinellid;e, und CalcispongiEe. 

 ' Annals,' 1877, vol. xx. p. 3-j7 et sea. ; 1878, vol. ii. p. 113 et seq. ; 

 1879, vol. i Ii. p. 301. respectively. Translated by W. S. Dallas, F.L.S. 



