ON THE FOSSIL PHYLLOPODA OF THE PALZOZOIC ROCKS. 357 
(5.) CERATIOCARIS INZQUALIS, Barrande. 
1868. Ceratiocaris inequalis, Barr. Bigsby, ‘Thes. Sil.’ p. 199. 
1872. as < a ‘Syst. Sil. B.’ vol. i. Suppl. p. 452, pl. 19, figs. 
14-16, 18; and Var. decurtata, figs. 17, 19. 
Some segments and appendages. Much smaller than C. Bohemica. 
Telson 70 mm. long. Stylets (fig. 18), 30 mm. long; var. decwrtata has 
them much shorter. A small crushed individual of this variety (fig. 19) 
bears the original little prickles along the telson. The lines of the longi- 
tudinal ornament are more inosculant than in C. Bohemica (fig. 15), and 
are oblique on a separate segment (fig. 16). The Brit. Mus. has two 
specimens (‘42585’). This species belongs to Barrande’s Colony d 9, 
and Stage Hel,e2. The var.toHKel. 
(6.) Crratrocaris ?! prpitis, Barrande. 
1868. Ceratiocaris debilis, Barr. Bigsby, ‘Thes. Sil.’ p. 199. 
1872. 3 3 re ‘Syst. 8. B.’ vol. i. Suppl. p. 448, pl. 18, figs. 20-25 ; 
pl. 19, figs. 20-27; pl. 26, fig. 18; pl. 31, figs. 16-19. 
Small, but like C. Bohemica in some respects. Only the appendages 
known. Style subflexuous (50 mm.), smooth on one (inner) face and 
pitted (= spinose) along two lines on the other (fig. 20). Style and 
stylets all ridged. A rostrum, probably of this species, narrow, chevron- 
marked, thin, and 6 mm. long, is shown at pl. 26, fig. 18. Ornamental 
lines, longitudinal, on the basal end of the telson (pl. 18, fig. 44). The 
Brit. Mus. has two pieces marked ‘42586,’ in one of which some frag- 
ments of a style or stylet (marked C. debilis) lie close by a carapace of 
Aristozoe perlonga, Barrande. This species belongs to Barrande’s Stage 
F £2; A. perlonga also belongs to Stage F f 2. 
(7.) CERATIOCARIS TARDA, Barrande. 
1868. Ceratiocaris tardus, Barr. Bigsby, ‘ Thes. Sil.’ p. 199. 
1872. = Fe W ‘Syst. S. B.’ vol. i. Suppl. p. 455, pl. 18, figs. 26-29. 
Fragments of a style orstylet (?) Outer face rounded and smooth ; 
inside channelled on each side of the smoothed and raised middle, with a 
row of large and small pits (= spines), symmetrically arranged in each 
channel (fig. 27). This species belongs to Stage G g 1. 
(8.) CERATIOCARIS PRIMULA, Barrande. 
1868. Ceratiocaris primulus, imperfectus, et elegans, Barr. Bigsby, ‘ Thes. Sil.’ p. 199. 
1872. z 9 Barr. ‘Syst. 8. B. vol. i. Suppl. p. 453, pl. 18, figs. 14-19. 
Two styles or stylets(?) only of this interesting form. They are 
spiniform, curved, and lozenge-shaped in section—that is, having four 
sloping sides or faces; the front and back edges are sharper than the 
side edges. The surface is faintly and irregularly ridged, and is pitted 
all over with the marks of former minute tubercles or spines (figs. 17 
and 19). This belongs to Stage Dd 5. 
M. Barrande has described and figured several specimens of the den- 
tate jaws (or teeth) like those of Ceratiocaris and Dithyrocuris, at p. 443, 
pl. 18, figs. 2-5; pl. 21, figs. 41-44; and pl. 31, fig. 21. 
It is remarkable that no Ceratiocaris is represented by the carapace 
among M. Barrande’s very numerous specimens. Some of the more 
1 See further on, p. 359, for O. Novak’s remarks on this form in relation to 
Bactropus and Avistozoe. 
