352 Trof. T. R. Jones — On some Palceozo'w PJnjUopoda. 



IL — Spathiocakis, J. M. Clarke, 1882. Amer. Journ. Sci. ser. 3, 

 xxiii. p. 477, xxv. p. 120, etc., N. Jahrb. f. Min. 1884, i. p. 181, etc. 



As characteristic of this genus we retain only those with a very 

 narrow nuchal notch ; the other forms referred to this genus having 

 this feature broad, as in Discinocaris and Cardiocaris. 



1. Sp. Mnersonii, Clarke, 1882, loc. cit. fig. 1. 



An elegant elliptico-obloug shield with narrow cephalic cleft. 



1 *"'% Sp. Emersonii, young form, Clarke, loc. cit. fig. 2. 



This seems to be too ovate for the species mentioned. 



1**. Sp. Emersonii, Clarke, fig. 3. 



This is figured as a side-view of a folded SpatMocaris, but it looks 

 like one-half of an Aptychopsis ; not having seen the specimen, we 

 cannot decide. 



These are from the Upper Devonian beds of the Portage and 

 Chemung groups in the western part of the State of New York. 



2. Sp. ungulina, J. M. Clarke, 1884, Neues Jahrb. f. Min. etc., 

 1884, i. p. 182, pi. iv. fig. 4. 



A neat oval shield, with narrow notch. From Upper Devonian 

 beds at Bicken, near Herborn, in Nassau. 



III. — Pholadocakis, H. Woodward, 1882. Geol. Mag. Dec. II. 

 Vol. IX. p. 388. 



Surface of shield marked by two radiate lines behind, and by two 

 shorter, curved lines in front of the centre. 



1. Fh. Leeii, H. W., 1882, loc. cit. PI. IX. Fig. 16. 



Of a cuneiform outline. From the Upper Devonian of Biidestheira. 



2. Ph. sp. n. Figured by F. A. Eoemer in 1850, as above mentioned. 



IV. — LisGOCARis, J. M. Clarke, 1882. Amer. Journ. Sci. ser. 3, 

 vol. xxiii. p. 478, fig. 5 ; and xxv. p. 124. 



The shield is here strongly radiate, behind with three ridges and in 

 front by two, giving a subpentagonal outline by their angularities at 

 the margin. The nuchal furrow is rounded at its apex (not angular). 

 Mr. Clarke thought to reunite it with SpatMocaris on account of 

 these two having no suture — neither has Discinocaris. The narrow- 

 ness of the angle in SpatMocaris and the rounded notch in Lisgocaris 

 should, we think, be regarded as leading characteristics. 



From the base of the Hamilton beds (Devonian), State of New York. 



V. — Ellipsocaris, H. Woodward, 1882. Geol. Mag. Dec. II. 

 Vol. IX. p. 444. 



Elegantly oval, with an oval notch. Its ornament of the usual 

 concentric lines of growth is accompanied by the delicate interlinear 

 sculpturing seen in Estheria. This shows the close relationship of 

 these Phyllopods. 



2. Ellipsocaris ? sp. nov. 



The little oblong, oval, and ovate tests found in Devonian strata 

 in Petschora-Land, and figured by Count Keyserling in 1846, are 

 mentioned above. They do not match in outline exactly the apertures 

 of any of the Goniatites figured from the same beds. 



VI.— Cardiocaeis, H. Woodward, 1882. Geol. Mag. Dec. II. 

 Vol. IX. p. 386. 



