46 BRITISH PALEOZOIC PHYLLOCARIDA. 



Dorsal aspect of a telson, and a separate stylet lying obliquely across and 

 beneath its lower half. Telson-head smooth, retaining some of its test, much cor- 

 roded, but showing a little of the lattice-pattern very definitely ; five or six ridges 

 go off downwards on this face, and the impression of the lowest moiety of the 

 telson shows that the other (under) face was also ridged. A definite row of bristle- 

 bases (pimples in depressions) is visible along one ridge on the dorsal face, 

 and doubtless there was a corresponding row now obscured. 



The loose stylet is smooth, but corroded ; and has the lateral rims, the slightly 

 convex outer edge, and obliquely truncated joint end that are seen in figs. 8, 9, 

 and others ; also observable in C. papilio, stygia, and longa. 



PL XI, fig. 15. Brit. Mus. 39404. Hard, olive-grey shale, calcareous on the 

 edge. " L. Ludlow ; Leintwardine. Mr. A. Marston." 



The under view of style and two stylets, somewhat like fig. 12, but longer and 

 thinner ; and towards the end this under side of the telson is marked with a 

 central furrow, which may indicate that the back or outside was angular, and the 

 section like that of a bayonet. Stylets smooth and showing the usual rims and a 

 very slight, central, longitudinal ridge. 



14. Cebatiocaris patula, sp.-nov. PI. XI, fig. 11. 



1885. Cebatiocaris eobusta (part), T. B. J. & R. W. Third Keport Pal. Phyll., 



p. 350. 



1886. — lata, 1 Fourth Report, p. 231; 



Geol. Mag., 1886, p. 458. 



We find several very small trifid sets of tail-spines, or parts thereof, which 

 at first were thought to belong to small individuals of G. robusta ; but a few 

 seem to be quite distinct. For some of the larger of these caudal appendages, 

 which we at first (1885) referred to G. robusta, we find equivalent styles, and 

 broad blade-like stylets,like long scalene triangles, in C. papilio, stygia, acuminata, 

 &c. ; but none seem small enough for the several little sets of trifid appendages, 

 more or less perfect, which we have met with. G. robusta takes in some 

 small forms (see above) ; but Oxford Mus. T is relatively broad, and might be 

 termed paXula (PI. XI, fig. 11) ; Brit. Mus. 58878 from Muirkirk, has very narrow 

 members (angusta, PI. X, fig. 9) ; and one set in the Owens College collection is 

 so neat, symmetrical, and small that it might be called minuta (PI. X, fig. 11). 



1 As this term has been used by Mr. Salter for a species of Ceratiocaris (though doubtful), we 

 think it advisable to change it for a synonym (patula). 



