552 PROF. T. E. JONES ON SOME DEVONIAN AND 



B. A larger collection, submitted by Mr. J. F. Whiteaves, F.G.S., 

 Palaeontologist to the Geological Survey of Canada, of Canadian 

 Palseozoic Ostracoda, comprises : — 



B. a. § I. Upper Silurian (Upper Ludlow) Formation. Dr. 

 Honeyman's "Arisaig Group*, Division D." Nova Scotia. 



§ 1. In dark-grey limestone, with haematitic stains, and made up 

 of small organisms, such as the Ostracoda, together with 14 species f 

 of MoUusca, Brachiopoda, and Trilobites, and some Encrinital re- 

 mains. Stonehouse Brook, Arisaig, Nova Scotia. Division D. 



1. Primitia mundula, J., a small variety. — This is probably the 

 Primitia mentioned at p. 492, lines 38-41, ' Quart. Jonrn. Geol. Soc' 

 vol. xxvi., but not the species referred to in lines 36-37. 



2. Primitia ovaia (?), J. & H. — An obscure oval cast, probably 

 the same form as referred to in ' Geol, Mag.' 1881, p. 344. 



3. Beyrichia tuhercidata, Boll, young ; B. tuherculata, var. pustu- 

 losa^ (Hall), and var. Bronni (Beuter). — Of six more or less perfect 

 casts of this Ostracode, five are very near to E-euter's variety tuber- 

 culata-gihhosa ; but the middle lobe is sometimes constricted, and 

 the marginal rim is smooth in some, and tubercled in others. One is 

 equivalent to B. Bronni, Eeuter (' Zeitsch. d. D. g. Ges.' 1885, p. 638, 

 pi. XXV. fig. 6. Another is a variety of B. tuherculata, with its 

 hinder lobe almost entire, and its anterior lobe hypertrophied. 



4. Beyrichia cecj^uilaiera. Hall. February No. Q,. J. G. S. page 18. 

 — Two specimens, like that figured in pi. ii. fig. 6, op. cit., differing 

 slightly from it in the proportions of the lobes. I have not yet met 

 with a specimen having a lobe quite divided into two parts, as in 

 the woodcut, fig. 20, published in 1860. 



§ 2. In a brown ferruginous cavernous band or bed-plane in a 

 dark-grey micaceous sandstone, with casts of Polyzoa, Encrinital 

 joints, Brachiopods, Trilobites, &c. M'^ Adams Brook §, below the 

 falls and fort, Arisaig, Nova Scotia. Division D. 



1. Beyrichia tuherculata, var. pustulosa (Hall), equivalent to 

 tuherculata-gihbosa, Beuter. — Three or four casts, badly preserved. 



B. b. § II. Lower Silurian ; Canada. 



§ 1. Trenton Limestone. — Dark-grey hard limestone, with Ostra- 

 coda, Encrinital joints, and small Brachiopods. Lorette, Palls of 

 the Kiver St. Charles, Province of Quebec. 



1. Primitia, sp. — Large, black, subconvex, boldly curved below, 

 obliquely and nearly equally rounded at the ends ; faint mid-dorsal 

 sulcus. 



* See Quart. Journ. Geol. Soc. vol. xx. 1864, pp. 333-345, and vol. xxvi. 1870, 

 pp. 490-492 ; also 'Acadian Geology,' 3rd. edit. 1878, pp. 565-570. 



t Determined by Mr. H. M. Ami, namely: — Murchisonia arisaigensis. Hall, 

 M. nova-scotica, H., NucuUteserectus, H., N. cuneatus, H., N. subovatus, H., 

 Megamhonia cancellata, H., Fterinea, sp., Pholidops squamiformis, H., Lmgula, 

 sp., Bhynchonella, sp., Chonctes tenuistriata, H., Spirifcra suhuculata, var. per- 

 lafa, H., Crania acadiensis, H., Calymenc, sp., Dalmania Logani, H., Beyrichia 

 puxtalosa, H., Cormditcs flcxnosus, H., yar. gracilis, H. 



J February No., page 18. 



§ See ' Quart. Journ. Geol. Soc' vol. xx. p. 342. 



