THE 
GEOLOGICAL MAGAZ ZINE. 
NEW SERIES. DECADE III. VOL. VI. 
No. IX.—SEPTEMBER, 1889. 
ORIGINAL ARTICLIHS. 
I.—On some nEw Devonian Fossits. 
By Prof. T. Rurert Jonzs, F.R.S., and Dr. H. Woopwarp, F.R.S. 
(PLATE XI.) 
J. Ecutnocarts Wurippornei. Plate XI. Fig. 1. 
| N this specimen one valve (the left) and a part of the dorsal 
region of the other, remain visible; the rest of the right valve 
being bent down, broken, and imbedded in the matrix. ‘This is 
a finely micaceous, non-calcareous, grey mudstone, weathering fer- 
ruginous towards one edge, which pully abutted on a crack 
open to water and atmosphere. 
The fossil, in the grey portion is darker than the matrix, and fairly 
represents the test of half of the carapace, with only a very thin’ 
lamina wanting, a broken edge of which is traceable (with a lens) 
near the ventral margin. This left valve measures 9:2 by 7-4 mm. 
Jt is subcircular, more boldly curved on the ventral than on the 
posterior margin, whilst the front margin is somewhat truncate,’ 
having a nearly straight edge from above downwards before it bends 
round into the ventral curve. The dorsal border was probably 
straight along two-thirds of its length, but has been crushed against 
the other valve and somewhat distorted. A distinct, narrow, mar- 
ginal rim is present,—thickened and raised on the front margin, and 
flatter on the ventral and hinder margins. 
The convexity of the surface is interrupted by several elevations 
and depressions. In the antero-dorsal region are five unequal 
swellings; one, large and pyriform, is most noticeable, and a small 
subtriangular swelling in front of it fills the antero-dorsal angle ; 
behind these a triangular space is occupied by three other unequal 
prominences; and altogether these represent the locality of the 
important cephalic (buccal or gastric) organs, and their muscular 
attachments. 
Behind the swellings are two ridges on the valve; one along its 
median line, and the other, parallel, but somewhat curved, on the 
ventral region. The swellings are each ornamented with a few 
small tubercles, somewhat wide apart. The ridges also bear such 
little tubercles ; the upper (straight) ridge having about nine, and 
the lower (curved) ridge has six. 
This fossil belongs ‘evidently to Echinocaris,’ Whitfield (1880) ; 
1 For the latest account of this genus and the several species here mentioned, see 
Geol. Surv. State of New York, Paleontology, by Prot. James Hall and J. M. 
Clarke. vol. vil. 1888, pp. 166-181, plates 28-30. See also our Sixth Report (for 
1888), Rep. Brit. Assoc. 1889, p. 180. 
DECADE IIIL—vVOL. VI.—NO. TX. 25 
