CERATIOCARIS LONGA. 43 



12. Cbratiocaeis longa, sp. nov. PI. VI, fig. 3 (?) ; PI. XI, figs. 2, 5. 



1878. Cebatiocaeis eobtjstus, S. JST. $• U. Catal. C. S. Foss., p. 142. 



1885. — eobusta, var. longa, T. B. J. & H. W. Third Eeport on 



Fossil Phyllop., Brit. Assoc, for 

 1885, p. 350. 



The specimens Ludlow Museum S., and M. P. G., x jj, 2 , have each a long 

 style and a strong stylet, attached to a broken ultimate segment (PI. XI, figs. 2 

 and 5), and were regarded as var. longa in the ' Third Report,' p. 350. If any 

 ornament was ever present it may have flaked off. The style or telson in these 

 specimens is too long for either G. stygia or G. papilio ; and 0. longa may stand 

 for a specific name. 



Specimen Ludlow Museum S. (PL XI, fig. 2) is a broad and long 

 telson (at least 63 mm. long), with linear ornament, from the Lower-Ludlow 

 beds at Bow Bridge, Ludlow. Part of an ensiform stylet, with its slightly convex 

 outer margin, shows from beneath it. 



PI. XI, fig. 2, shows a style, ridged and furrowed, and one broad stylet, both 

 flattened out by vertical pressure, with the dorsal face downwards, and represented 

 by an impression, with some ferruginous replacement, and some remnant of test. 

 The latter is on the lower half of the style, and is partly the inside of the embedded 

 test (dorsal face), and partly the whole substance. There are traces of bristle- 

 bases, here and there towards one side (the left-hand side as figured). The 

 specimen lies in greenish-grey, hard sandstone, slightly micaceous. 



PI. XI, fig. 5. Mus. Pract. Geol. x ^, 3 ('Catal. C. S. Foss.,' 1878, p. 142, 

 G. robustus). In hard, olive-green, micaceous shale, from Leintwardine, and 

 closely resembling fig. 2 in its telson (56 mm.) and stylet (25 mm.). In both 

 cases the style has been flattened by pressure ; in fig. 5 one half longitudinally 

 has split away, and the other has been made rugose by decomposition. 



The specimen figured in the ' Silurian System ' and ' Siluria,' and copied in PI. 

 VI, fig. 3, may very well have belonged to such an individual as the specimen 

 marked S in the Ludlow Museum, and described above. In the * Silurian System,' 

 1839, it was termed Onchus, pi. 4, fig. 63 ; Leptocheles sp. ' Siluria,' 1854 and 1869, 

 pi. 19, fig. 3. 



