CERATIOCARIS CASSIOIDES. 59 



Each individual has the ultimate body-segment in place, with short caudal 

 spines. A very delicate oblique striation is present on the exposed segment of the 

 lower specimen. The telson shows minute pittings in the upper specimen of 

 fig. 7 a. 



Projecting from the edges of these carapaces are broken pieces of ventral rims 

 of other specimens. These remnants are figured on a larger scale in figs. 7 d and 

 7 e ; and a piece of a rim (fig. 7 b) from fig. 7 a is given to show the characteristic 

 arrangement of the strige running into the marginal rim, and determining the nature 

 of figs. 7 d and 7 e. 



27. Ckeatiocaeis cassioides, T. B. J. and H. W., 1886. PI. Ill, fig. 9 ; PI. IV. 



fig. 7 ; PI. VII, figs. 

 4, 5, 6. 



1878. Ceeatiocaeis tesica (part), Euxley, Newton, and Ether idge. Catal. Pobs. 



M. P. G., p. 142. 



1885. — Salteeiana (part), C. cassia (part), and CEnATiocAEis, 



sp. nov. ?, T. R. J. & H. W. Third Eeport, 

 pp. 348, 349 ; Geol. Mag., 1885, pp. 462, 

 463. 



1886. — CASSIOIDES, T. B. J. ^- R. W. Fourth Eeport, p. 231 ; Geol. 



]\rag., 1886, p. 458. 



Carapace deeply boat-shaped, very slightly convex on the back at the anterior 

 third, where it slopes down to the front ; pointed or beaked in fi'ont, boldly curved 

 below, and obliquely truncate, with an upward and outward ogee slope behind. 

 Surface smooth ; much wrinkled by pressure, showing its soft but tough consist- 

 ency. The ultimate segment has faint oblique strise from above downwards and 

 backwards. The telson in one specimen (PL IV, fig. 7) is 11 mm. long. Stylet 

 shorter. 



Somewhat similar to C. cassia, in the characters of the carapace, but larger 

 and otherwise different. The specimens have more abdominal segments exposed 

 and proportionally longer caudal appendages. The species might be conveniently 

 named C. cassioides. 



These specimens should be studied in the order of PI. VII, fig. 6, fig. 4, fig. 5 ; 

 PI. Ill, fig. 9 ; and PI. IV, fig. 7, for accurate and gradational comparison. 



Mus.Pract. Geol. x-^ ('Catal. C. S. Foss.,' 1878, p. 142), has its carapace and 

 abdomen preserved in place. This is marked " Ceratiocaris vesica, Salter ; Lower 

 Ludlow; Leintwardine ;" and is in an olive-grey mudstone, finely micaceous, and 



