354 REPORT—1885. 
D. Extra-British Fossil Phyllocarida. 
24, CErRATIOCARIS (?) LonGicAuDA, D. Sharpe. 
1853. Dithyrocaris? longicauda, D. Sharpe. ‘Quart. Journ. Geol. Soc.’ vol. ix. p. 158, 
; pl. 7, fig. 3. 
The ultimate segment and trifid appendage of a small Ceratiocarid of 
uncertain genus. Except that the central spine or style is the longest 
of the three, this little fossil might be almost matched with C. EH. Beecher’s 
Elymocaris siliqua, pl. 2, fig. 1, and p. 13, of his memoir in the ‘ Report 
Geol. Surv. Penns.’ 1884. The segment (about 8 mm.) is described as 
‘simple and rounded’; the spines as ‘lancet-shaped,’ . . . ‘the middle 
one somewhat rounded and twice as long as the lateral plates, which are 
nearly flat.’ . . . ‘From the upper division of the Lower Silurian forma- 
tion at Sazes, in the Serra de Bussaco.’ Collected by Senhor Carlos 
Ribeiro. In the Geological Society’s Collection (?). 
This set of spines is much stouter than the specimens M. P. G. p 23, 
and both stouter and shorter than the somewhat similar small set in the 
Owens Coll. Mus. (See above, p. 350.) 
25. Ceratiocaris Drwen, Hall. 
1852. Onchus Deweii, J. Hall. ‘ Geol. Surv. New York, Paleontology,’ vol. ii. p. 320, 
pl. 71, figs. la—1d. 
1859. Ceratiocaris Deweti, J. Hall. ‘Geol. Surv. N. Y. Pal.’ vol. iii. p. 420*. 
A fine large telson, 6 inches long, and about 20 mm. wide at its basal 
joint ; gently curved, ridged, and pitted (once spinose) ; bulbous, with a 
strong articulation, at its base (figs. la, 1b). Figured with its sharp end 
upwards. 
Also the ultimate segment (fig. 1c) of the abdomen, 23 inches 
(65mm.) by about 22mm. broad (high). Its ornament (fig. 1d) consists 
of imbricating, narrow, lanceolate, low elevations, which are obliquely 
striated, thus reminding us of the ornamentation of C. Scharyi, Barrande, 
‘Syst. Sil. Bohéme,’ p. 454, pl. 32, figs. 24-29; and we find similar orna- 
mentation in some British forms. 
O. Deweii is from the Niagara Shale (Upper Silurian) of Lockport 
and Rochester, State of New York. 
26 & 27. Crratiocaris Maccoyrana, J. Hall; and C. acumtnata, J. Hall. 
1859. Ceratiocaris Maccoyianus, J. Hall. ‘Geol. Surv. N. Y. Pal.’ vol. iii. Part I. 
(text), p. 421*, and Part II. (plates), 1861, pl. 84, figs. 1-5. 
1859. C. acwminatus, J. Hall. ZL. c. p. 417*, p. 422%, pl. 84, fig. 6, & 7 (2). 
These specimens were obtained from the Upper-Silurian Waterlime 
Group, near Buffalo, New York State. 
Fig. 1 (C. Maccoyiana) is rather obscure, and reminds us at first 
sight of an imperfect QO. stygia, with the body-segments and caudal append- 
ages reversed, so as to emerge from the anterior (broken) part of the 
carapace. 
Fig. 2 has a carapace somewhat like C. stygia, modified by pressure, 
very delicately striate, and with the abdomen reversed to ‘the antero- 
ventral part of the carapace. 
Fig. 3 shows two end segments and a trifid appendage, somewhat 
like those parts in a specimen (from Benson Knot), Cambr. Mus., 6/6, 
which we refer with doubt to O. stygia. 
sae: 
