466 Prof. Jones and Br. Woodward — Species of Ceratiocaris. 

 18. Ceratiocaris (?) insperata, Salter. 



1866. Ceratiocaris ? insperatiis, Salter. Mem. Geol. Survey, vol. iii. p. 295. 

 1S67. ,, ,, Salter. In Siluria, 3rd (4th) edit. p. 516. 



1873. ,, ,, Salter. Cat. C. S. Foss. p. 16. 



1877. ,, ,, H. Woodward. Cat. B. F. Crust, p. 71. 



In the Cambridge Museum (a/275). Obscure remnant of an 

 ultimate abdominal segment, with clear indications of a trifid ap- 

 pendage ; the telson or central spine seems to be the longest, but all 

 three are broken off above their points. The telson is about 35 mm. 

 long. From dark-grey shales between the Lower and Upper Tre- 

 madoG Slates in a railway cutting above the village of Penmorfa, 

 Portmadoc. Collected by Mr. D. Homfray. Mr. Salter thought 

 that it belonged to the same species as the foregoing. 



19. Ceratiocaris (?). 

 An obscure hinder moiety (25 x 12 mm.) of a carapace possibly 

 referable to Cemtiocaris, is in the Mus. Pract. Geol. -gf, Catal. C. S. 

 Foss. 1878, p. 72. From the " Upper Llandovery ; Onny River." 



20. Ceratiocaris (?) perornata, Salter. 



1878. Ceratiocaris? perornatus (Salter MS.), Huxley and Etheridge. Catal. 



Cambrian and Sil. Foss. M. P. G., p. 142. 



An obscure form, known from only three small fragments, two of 

 which are pitted all over, and one is tuberculate, like an Echinoderm 

 spine. From Benson Knot, Kendal. 



21. Ceratiocaris (?) elliptica, M'Coy. 



Ann. Mag. N. H. ser. 2, vol. iv. p. 413. 



Brit. P. Foss. fasc. i. p. 137, pi. i E. fig.8. 



Catal. Brit. Foss. 2nd edit. p. 103. 

 In Siluria, 2nd (3rd) edit. p. 538. 

 Ann. Mag. N. H. ser. 3, vol. v. p. 157. 

 In Siluria, 3rd (4th) edit. p. 516. 

 Catal. Camb. Sil. Foss. p. 178. 

 id ward. Catal. Brit. Foss. Crust, p. 71. 



This interesting sjDecies, one of the first two established, is rej)re- 

 sented in the Cambridge Museum by specimen 6/15 (M'Coy's fig. 8), 

 and in the Museum of Practical Geology by |f (Catal. 1878, p. 118) 

 and X iV (Catal. p. 142). The carapace is long-ovate in outline, not 

 very convex, greatest convexity of surface and curvature of ventral 

 margin "at about one-third from the anterior end"; obliquely 

 rounded in front ; obliquely truncate at the upper portion of the 

 hinder end. There is a spot like a definite ocular tubercle in the 

 anterior fourth and above the median line of each valve, and this 

 gives it a distant likeness to a guinea-pig's profile. The surface is 

 neatly marked with delicate, longitudinal, parallel lines, rather far 

 apart. The published figure of the specimen, 6/15 (32 mm. long 

 and 13mm. high) is reversed, and drawn too angular behind. It 

 came from the Upper Ludlow Sandstone of Benson Knot. Specimen 

 M. P. G. tf is from the Lower-Ludlow beds of Leintwardine, near 

 Ludlow, and is not quite so large nor so well preserved as 6/15. 

 Specimen M. P. G. x ^, from the Upper-Ludlow of Combe Wood, 

 Presteign, is larger and more ovate or elliptical than the others, but, 

 unfortunately, is imperfect. The last two have been incorrectly 



1849. 



Ceratiocaris 



ellipt 



'cus, 



M'Coy. 



I85I. 









M'Coy. 



1854. 









Morris. 



1859. 









Salter. 



i860. 









Salter. 



1867. 









Salter. 



1873- 









Salter. 



1877. 









H. Wo 



