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- ON THE FOSSIL PHYLLOPODA OF THE PALZOZOIC ROCKS. 337 
(telson) strong, bulbous at its base, and with a strong dorsal rib; the 
side spines long. All ribbed. The whole animal medium-sized. Speci- 
“mens possessed by the geologists at Ludlow and by the Museum of 
Practical Geology.’ The carapace described here does not agree with 
any that we can associate with the caudal spines intended. Nor do we 
find at Ludlow exactly the kind of carapace required. 
ToC. leptodactylus Mr. Salter apportioned—‘ a cephalothorax long, tri- 
‘angular, acute in front, broad and rounded behind. Free abdominal 
‘g ements 7-8 in number, subquadrate, deeply impressed at the sides. 
“Caudal appendages long, striate; the central spine (telson) scarcely 
icker than the long lateral spines. Surface of the head (carapace) 
smooth, or marked with only very short sparse lines. Abdominal seg- 
ments strongly striate. The whole animal elongate and more than a foot 
long.’ One particular specimen in the Mus. Pract. Geol. is referred to by 
‘My. Salter at p. 158. We are at a loss here also in fitting the indicated 
(slender) appendages to the carapace described. We have examined this 
and other good specimens, labelled C. leptodactylus by Mr. Salter or at his 
direction, in which the carapace agrees with his description. One cara- 
pace is of large size, nearly perfect, about 125 mm. (5 inches) long, by 
Db) mm. at greatest height; M. P. G. x 4, ‘ Catal. Cambr. Sil. Foss.’ 1878, 
p. 142. A specimen nearly perfect, M. P. G. x + (‘ Catal.’ 1878, p. 142), 
60 mm. long by 28 mm., gives no certain indication of the length of its 
felson and its two stylets, for they are crushed off short. The abdomen 
posed is about 50 mm. In specimen D of the Ludlow Museum, which 
s the proximal portion only of the caudal spines preserved, and in 
imen B, with the appendages also broken off short, the telson was 
ribbed and pitted (—prickly), thereby differing from the spines known as 
C. leptodactylus (M‘Coy). 
__ There is also a well-preserved small specimen (M. P. G. x 4, ‘Catal.’ 
1878, p. 142), with its carapace measuring only 25 mm. in length and 
Tl mm. in height, from the Lower Ludlow of Bow Bridge, Ludlow. 
_ This is labelled ‘ C. leptodactylus,’ and belongs to the same species as the 
foregoing. Its caudal appendages are perfect, with the telson (25 mm.) 
about one-third of the length of the whole animal; but they differ from 
Moy’s C. leptodactylus, for they are not only ribbed or ridged, but the 
telson was prickly ; the laterals were probably rather more than half its 
fength. Specimen M. P. G. p 73, however, from Dudley, is a thin spini- 
form fragment, faintly striated, like C. leptodactylus. 
_ Altogether the telson (style) and stylets of these specimens have 
pa close resemblance to those known as C. Murchisoni (see above, 
p. 336). One example, from Dudley, described and figured as such by 
H. Woodward in the ‘ Geol. Mag.’ vol. iii. p. 204, pl. x. fig. 8 (stylets and 
the upper moiety of the style, 90 mm., even more than 5 inches long 
when perfect), was doubtlessly proportionate to the large carapace, 
M. P. G. x 1, above alluded to, as belonging to an animal more than 
12 inches long; the carapace, exposed segments, and the telson being 
each a third of the whole length. 
__ Other good specimens of these caudal appendages are :— 
__ Ludlow Museum, C. Lower Ludlow; Leintwardine.! Lower portion 
of the style and stylets, 180 mm. (51 inches). 
’ This is mounted with specimen D as one specimen; but the discrepancy between 
the two parts is readily seen. It is referred to in the Rev. J. D. La Touche’s ‘ Geol, 
Shropshire,’ &c. p. 77. 
1885. . Z 
