Prof. T. Rupert Jones — On the Palceozoic Phyllopoda. 457 



proportion to those in other specimens marked f-f, and referred to 

 C. Murchisoni, and very much narrower and smaller than in C. gigas, 

 we separate as a new species, to be called C. attenuata. They have 

 straight styles and stylets, very much shorter than in either of the 

 foregoing. 



6. Two small specimens of crushed telsons (one in Mr. Cooking's 

 collection, and the other M.P.G. X 2V, both from the Ludlow series), 

 probably smaller than C. Murchisoni, have a fluted or channelled 

 sculpture on their upper part, instead of either wrinkles or leaf- 

 pattern ; hence they may be regarded as belonging to a distinct 

 form, for which the name canaliculata will be convenient. 



7. One fine large carapace (M.P.G. X \) and others smaller and 

 less definite in some respects (M.P.G. X-f; X i ; X-§-: Ludlow 

 Mus. A ; Oxford Mus. K and J), and associated with segments and 

 appendages, we regard as distinctive of a new species, though hitherto 

 referred to C. leptodactylus (Third Rep. pp. 12, 15). The test 

 appears to have been of an unusually solid consistency. 



These carapaces in some instances have been much modified by 

 pressure, but we trace a close similarity throughout the series, allow- 

 ing for probable differences of age. The shape approximates to that 

 of Dr. James Hall's species C. acuminata and F. Schmidt's C. 

 Noetlingi (Third Rep. p. 30). There are marked differences, how- 

 ever, and we intend to designate this form C. Halliana, in honour of 

 our old friend, who began working at these Phyllocarida as early as 

 1S52. 



A perfect specimen of C. acuminata. Hall, has been lately described 

 and figured by Dr. Julius Pohlman in the Bulletin of the Buffalo 

 Society of Natural Sciences, vol. v. No. 1, 1886, pp. 28, 29. pi. 3, 

 fig. 2. Its caudal appendages are much like those of G. papilio and 

 C. stygia, the style being relatively short, and the stylets broad and 

 blade-like. The appendages in M.P.G. X f, Xi, and Ludlow Mus. 

 A are different from these, being thinner, tapering slowly, and pitted 

 in at least one row, as exposed. 



8. C. Pardoeana, La Touche. Two carapaces with segments and 

 parts of appendages from Ludlow (Ludlow Mus. B and D ; Third 

 Rep. p. 12) differ from any other form. One of them (B), with a 

 wrong caudal appendage attached to it, in the Ludlow Museum, has 

 been labelled ' G. Pardoensis,' and as such is referred to in J. D. La 

 Touche's Guidebook to the Geology of Shropshire. "We retain this 

 name (altering the termination, as it refers to a person, and not a 

 place) for the two carapaces here referred to. One of them (B) is of 

 special interest as having its rostrum still in place. 



9. The fine large specimen of C. ludensis, H. W. (Third Report, 

 p. 16), has been again carefully studied, and we find reason to believe 

 that the caudal appendage which appears longest in the fossil was 

 not really the longest, or the true telson, but was one of the ' laterals ' 

 or stylets. Hence the whole animal was probably much longer than 

 our former estimate made it. 



10. C. robusta, Salter (Third Report, p. 24), being based merely 

 on some small caudal appendages (Cambridge Museum a/925 and 



