ON THE FOSSIL PHYLLOPODA OF THE PALiMOZOlC ROCKS. 175 



■(see Fourth Report, &c., p. 233), which occurs at an equivalent horizon 

 — the " Hercyniau " of Beyrich and Kayser, = " Stages F, G, and H," of 

 Barrande.' 



§ VI. Devonian Phyllocarida of Neiv- York State. — In the ' Bulletin 

 of the U. S. Geological Survey,' No. 16, 8vo, 1885, Mr. John M. Clarke 

 has given a memoir ' On the Higher Devonian Faunas of Ontario County, 

 New York,' in which he describes and figures the following Phyllo- 

 carida : — 



1. Ceratiocaris simplex, J. M. C, p. 43 (7"?), pi. 2, fig. 2. Carapace- 

 valve nearly oval in outline, 30 mm. long and about 10 mm. wide (high). 



2. G. Beecheri, J. M. C, p. 44 (78), pi. 2, fig. 1. Three abdominal 

 segments and three caudal spines, not well preserved. Proportionally too 

 large for the foregoing species. The ultimate segment is apparently 

 shorter than usual in this genus. 



3. Echinocaris WhitfielcU, J. M. C, p. 45 (79), pi. 2, figs. 3 and 4. 

 Carapace- valve 27 mm. long and 16 mm. wide (high) ; with the middle 

 and one of the lateral caudal spines, the latter longer than the former. 



4. Equisetides Wrightiana, Dawson, 1881 (Echinocaris Wrightiana, 

 J. & W. ' Geol. Mag.,' 1884, p. 395, pi. 13. fig. 1), is mentioned at p. 66 

 (100). See also our Third Report (for 1885), p. 360. 



5. Spathiocaris Emersoni, J. M. C. Notes on the genus and localities 

 for this species are given at pp. 46 (80) and 47 (81). 



In the Table at p. 69 (103) Ceratiocaris longicauda, Hall, is noted as 

 •occurring in the ' Genessee Shales ' and the ' Portage Beds,' in which 

 latter occur also Dipterocaris p>ennai.I)cedali, CI., I) . pes-cervm, CL, and B. 

 Procne, CI. The ' Naples Shales ' have yielded Ceratiocaris simplex, CI., 

 G. Beecheri, CI., Echinocaris Whiffieldi, CL, Ech. Wrightiana (Dawson), 

 and Spathiocaris Emersoni, CI. See also our Second Report (for 1884), 

 pp. 78, 80, 81. 



§ VII. Bactropus in Devonshire. — The Rev. G. F. Whidborne, F.G.S., 

 has identified from the Devonian strata of Torquay a specimen oi Bactropus 

 longipes(?), Barrande, which M. Ottomar Novak > has shown to be really 

 the chief abdominal segment (or ' post-abdomen ') of Barrande's Aristozoe 

 regina ; whilst Ceratiocaris deiilis, Barrande, is the style (telson) of the 

 same bivalved Crustacean (Phyllocarid). 



§ VIII. Tremadoc Fossils. — In the First Report on the Palfeozoic 

 Phyllopoda (1883) a tabular synopsis of the known fossil genera was 

 published, together with descriptive notes on some of the species, from 

 the Tremadoc and other old rocks, including Hymenocaris, Caryocaris, 

 and Lingulocaris. The well-known Hymenocaris vermicauda is therein 

 described from specimens obtained from many localities of the Lingula- 

 flag and Tremadoc-slate series of North Wales, and preserved in the 

 •collections of the British Museum, Geological Survey, Cambridge Uni- 

 versity, and Owens College. The track-marks on Lingula-flags, near 

 Tremadoc, ascribed by Salter to Hymenocaris, are also alluded to. 



The 'Hymenocaris (Saccocaris) major' of Salter is also referred to at 

 pp. 219, 220. Though three specimens have been thus labelled in the 

 Cambridge Museum, with some doubt and possibly by Salter himself, 

 only one of them answers to Salter's brief generic description, and on 

 this the following determination is founded. 



' Sitzungshcr. Ji. hdhm. Gesell. WissenscJi., Jahrgang 1885, pp. 239-243, pi. 1. See 



also our Report for 1885. p. 359. 



