614 Notices of Memoirs — Prof. T. R. Jones — Phyllopoda. 



VI. Three species of Peltocnris are (1) P. aptychoides, Salt'er; 

 (2) P. anatina, Salter; (3) P. patula, sp. nov. 



Like Aptychopsis, Peltocaris is an Upper-Silurian British form, 

 with some representatives in the Midrile Silurian. 



VII. Pinnocaris LapivortJii, Etheridge, jun., a rare Silurian form, 

 is known in Ayrshire and Westmoreland. 



VIII. Of the round snbconical tests, undivided except by the 

 triangular nuchal notch, Discinocaris gives four species, all from the 

 Upper or Middle Silurian of South Scotland and Westmoreland : 

 1. I). Browninna, H. W. 2. D. ovalis, sp. nov. 3. D. widulata, 

 sp. nov. 4. D. gigas, H. W. 



The British specimens here referred to belong to — (1) the British 

 Museum ; (2) the Museum of Practical Geology and Geological 

 Survey of Great Britain ; (3) Museum of the Geological Survey 

 of Scotland; (4) Museum of the Geological Survey of Ireland; 

 (5) Woodwardian Museum, Cambridge ; (G) Museum of the Owens 

 College, Manchester. The authorities of these institutions have 

 courteously given us facilities (by loan or otherwise) for studying 

 the specimens. For the loan of a large series we owe thanks to 

 Mr. J. D. Brown, of Moifat, and for others to Dr. C. Lapworth, of 

 Birmingham. The late Mr. James Duiron, of Glasgow, also oblig- 

 ingly lent us some specimens. 



The Pinncaridce (Dithyrocaris. etc.) have next to be described and 

 figured in detail ; and further descriptions and figures are required 

 of the Ceratiocaridce, for which the Committee have accumulated 

 much material. Mr. J. G. Williams, F.G.S., of Ffestiniog, has lent 

 the Committee a large series of North -Welsh Phyllocarids, including 

 Hymenocaris and other genera, which will require careful study. 



The chief additions since 1889 to published information about the 

 Palaeozoic Phyllopoda are — 



1. Some notes on the Devonian Estheria memhronacea, with a 

 figure and description of an oblong variety, showing the concentric 

 riblets and interstitial ornament, in the Geological Magazine, 1890, 

 PI. XII. Fig. 9, and 1891, p. 50. 



2. In his Meraoire sur la Faune du Gres Armoricain (Annales 

 Soc. Geol. du Nord, vol. xix. 1891), Dr. C. Barrois, after noting 

 (pp. 147 and 149) that the little fossil, quoted by MM. de Tromelin 

 and Lebesconte as Cytheropsis subtesiis (Report Assoc. Fran 9, 

 Congres de Nantes, 1875 [1876], p. 23) is a Primitia, near P. debilis, 

 Barrande, proceeds to treat of Myocnris lutraria at pp. 220 and 221, 

 pi. V. fig. 4 ; and describes a small caudal spine, probably of a 

 Ceratiocaris, p. 221, pi. v. fig. 3; also an abdominal segment and 

 caudal appendages (style and stylets) of a new Ceratiocarid, namely, 

 ' Trigonocarys' [^Trigonocai-is^ Lebescontei, nov. gen. et sp., pp. 

 222-226, pi. V. tigs. 5 and 6 ; all from Guichen. 



3. Description of Fossils from the Palaeozoic Eocks of Ohio, by 

 E. P. Whitfield (Annals New York Acad. Science, vol. v. December, 

 1890) :— 



Page 562. Phyllopoda, p. 563, EcMnocaris, Whitfield (Amer. 

 Journ. Sci. 1880). 



