204 "" H. Woodward — Ooi Ceratiocaris. 



Only the carapace of this curious pod-shrimp was recognised by him, 

 but it has been quite restored by Mr. Salter's ^ skill ; and even the 

 dentition is now well known to us.* It is not, however, to these 

 almost perfect examples that I would now direct attention, but 

 rather to some fragmentary remains from Westmoreland, Yorkshire, 

 and Worcesterslure, which have lately been submitted to me for 

 examination. 



1 received the first, and by far the most perfect, example from Mr. 

 E. Hollier, of Dudley, who obtained it from the Wenlock shale, 

 Dudley. (See Plate X. Fig. 8). It exhibits the strong tail-spine, 

 deeply grooved longitudinally, and having a row of pmictations on 

 either side of the two uppermost furrows, with the two lateral 

 spines attached to it, also striated longitudinally, but not ornamented 

 with punctations. A portion of the last body-segment remains still 

 articulated to the broad proximal end of the telson. 



The fossil is about four- inches in length, and was probably two 

 inches longer, as the pointed extremities of the spiaes are broken off. 



The tail-spine of Ceratiocaris does not appear to have been quite 

 straight, but somewhat curved in profile, as seen in the figure (Plate 

 X. Fig. 8). 



The lines of punctations along the telson, evidently indicate where 

 spines, or bristles were implanted, as observable in the limbs of 

 Decapod Crustacea from the Lias and Oolite. (See Geol. Mag., 

 Vol. III., p. 11, Plate I.). The specimen from Dudley has been 

 partially worked out on the upper edge of the slab of shale on which 

 it rests, so as to expose both sides of the central spine (telson), and 

 although much flattened, it exhibits another row of punctations 

 corresjDonding to that seen in the plate, and two iatermediate dorsal 

 furrows. 



The end view of a small specimen, not crushed, from the Upper 

 Silurian of Bohemia, has been figured in order to show the longi- 

 tudinal furrows, and the row of ptmctations on either side of the 

 telson. (See Plate X. Fig. 10). This appears to be a persistent 

 character of the telson in most of the larger forms. In the " Annals 

 and Magazine of Natural History," for March 1860, Mr. Salter de- 

 scribes and figures, — 



1. Ceratiocaris papilio, from the Upper Silurian of Lesmahagow, 



Lanarkshire, and appends description of the following species : — 



2. Ceratiocaris stygius, Salter, U. and L. Ludlow Eock ; Lanark. 



3. „ wornaiMs, M- Coy, U. Ludlow Eock ; Benson Knot. 



4. „ MurcJiisoni, M'Coy, sp. U. Ludlow Eock; Ludlow. 



5. „ lejptodactylus, M'Coy, sp. U. Ludlow Eock; Ludlow. 



6. „ Tohustus, Salter, U. Ludlow Eock ; Leintwardine. 



7. „ decorus, Phillips, Ludlow Eock ; Pembrokeshire. 



8. „ ensis, Salter, Lr. Ludlow Eock ; Leintwardiae. 



9. „ vesica, Salter, Lr. Ludlow Eock ; Leintwardine. 



10. „ cassia, Salter, Lr. Ludlow Eock ; Leintwardiae. 



' Ann. and Mag. Nat. Hist., March 1860, p. 153. (Eleven species described). 



2 Geological Magazine, Vol. II., p. 401, PI. XI. 



