ON THE FOSSIL PHYLLOPODA OF THE PALEOZOIC ROCKS. 233 



silky, linear ornament. As a new species this might be known as 

 E. tenuisiriata. The specimen X -jJj^ is subovate, larger than either of the 

 •othet" two, and is coarsely striate, with longitudinal anastomosing wrink- 

 lets, and might be named E. crassistriata. M.P.G. -§4 i^ smaller than 

 any of the foregoing, somewhat boat- shaped, between the last and elliptica 

 in shape, but not identical with either ; and it is rather coarsely striate 

 longitudinally. To this form we propose to give the name E. Mac- 

 coyiana, in honour of the first describer of any member of this genus. 



21. At page 26 of the ' Third Report,' we described Salter's Geratio- 

 caris ? ensis, and now we are still more confirmed in the opinion that it 

 belonged to a distinct genus. Its large size, its curvature, and the 

 serration on both the upper and the lower edge, and the profuse spination 

 (as shown by pits) on the latter distinguish it from other telsons ; and 

 more particularly its lozenge-shaped sectional area, of an unequal rhombic 

 form, blunter at the outer (upper) and convex edge than on the other, the 

 ridge along the sides not being quite on the medial line, but neai'er the 

 outer than the inner edge. We propose the name Xiphocaris ' for this 

 ■rare genus. 



M. Barrande's Ceratiocaris primula ('Third Report,' p. 32^ has a style 

 (or stylet ?) with lozenge- or diamond-shaped section ; but this uropod, 

 though curved, is of different dimensions, and is pitted all over. 



22. Physocaris vesica, Salter (' Third Report,' p. 28), we consider as 

 having had its abdominal segments shifted from below upwards, and 

 turned over on their axis, after death ; and therefore as having been 

 •figured upside down. 



23. Of G. ? lata, insperata, and perornata we have no further evidence 

 at present. 



24 Ceratiocaris ? longicauda, D. Sharpe (' Third Report,' p. 29), a 

 foreign (Portuguese) form within our reach, has been studied in the 

 Geological Society's Museum, Burlington House, and shows some inter- 

 esting features. Its scientific name was given under the supposition that 

 the fossil was a Dithyrocaris, with a longer abdomen than usual ; but its 

 cylindrical ultimate segment, its somewhat bayonet- shaped style, and 

 blade-like stylets clearly remove it from that genus, as intimated in our 

 former notice. It is probably distinct also from Ceratiocaris ; it has some 

 analogy with the Devonian Elymocaris ; but at present we cannot fix its 

 generic place. 



25. In the ' Sitzungsb. K. bohm. Gea. Wiss.' 1885, M. Ottamar 

 Novak, Keeper of the Barrande Collection at Prague, has described a 

 new Phyllocaridal genus from the etage F, f 2, in Bohemia, as Ptycho- 

 caris, with two species Ft. simplex and Pt. parvula, characterised by a 

 strong and obliquely longitudinal ridge or sharp fold on each valve, and 

 by an anterior group of three small nodules, an ocular tubercle behind 

 them, and some larger but less distinct swellings further back, but still 

 in the antero-dorsal region. M. Novak supplies also a Table of the 

 vertical distribution of the Phyllocarida in Bohemia. 



In the Annales XIII. Soc. Geol. du Nord, 3^6 Livr. April 1886, p. 

 146, M. E. Canu gives a resume of the results of M. O. Novak's re- 

 :searches in the Phyllocarida, with some woodcuts of Aristozoe regina, 

 Bactropus hngipes, and Ceratiocaris dehilis (see ' Third Report,' pp. 

 S2-34), and of Pfyclwcaris simplex (see above). 



26. Dr. A. S. Packard, junior, has described and figured some 



' a'upos, a sword ; Kapls, a shrimp. 



