486 Dr. H. Woodward — Synojjsis of the Species of 



This species ia general form agrees most nearly with G. longi- 

 spinus, Portl.,^ but G. glaber, asits name implies, is smooth or nearly 

 so, whereas G. longispinus is coarsely tuberculated both on the head 

 and body segments, the tail alone being smooth. 



In G. glaber there is a trace of minute serration seen on a pygidium 

 from Ashford, Derbyshire, not discernible on the other specimens, 

 but I consider that they all belong to one and the same species. 



Formation. — Carboniferous Limestone. 



Localities. — Castle-Mumbles, Grlamorgan shire ; Northumberland ; 

 and Derbyshire. 



All the above specimens are preserved in the Museum of Practical 

 Geology, Jermyn Street. 



Gkipfithides ? Cakringtonensis (Eth,, MS.), H. Woodw., 1884. 

 Plate XVI. Fig. 2. 



Griffithides Carringtonensis, H. Woodward. Pal. Soc. Mon. Carb. Trilob. part ii. 

 1884, p. 41, pi. ix. figs. &a and b. 



This species, named by Mr. Etheridge, F.R.S., in manuscript, is 

 represented by two pygidia in the collection of the Museum of 

 Practical Geology, Jermyn Street, and one of larger size in the 

 British Museum Collection. 



Head-shield and thorax unknown. Abdomen or Pygidium. — The 

 largest specimen (which is preserved in the British Museum) 

 measures 17 mm. in breadth and 15 mm. in length; the axis is 

 7 mm. broad at its proximal end, diminishing to 3^ mm. at the 

 distal extremity. It terminates at a distance of 3 mm. from the 

 posterior border, which is smooth, and continues so around the 

 semicircular margin of the pygidium. Twelve coalesced somites are 

 indicated by as many broad and flattened rings in the axis, which 

 have a faint vertical line crossing them on each side of the axis and 

 parallel to the axal furrows. The pleurae, nine in number, terminate 

 abruptly about 3 mm. from the margin, and are each divided by 

 a median groove. 



The other' and smaller specimens measure 10 mm. in width by 

 7 mm. in length, and 11 mm. wide by 8 mm. long. 



The pygidium of this species agrees most nearly with G. obsoletvs, 

 but the latter has no distinct margin to the tail-shield, and has only 

 ten axal rings. 



Formation. — In white crystalline Carboniferous Limestone. 



Localities — Falls Brew, Caldbeck, Cumberland (Mus. Brit.). 

 Longnor and Narrowdale, Derbyshire. (Mus. Pract. Geol.) 



Phillipsia laticatjdata, H. Woodw., 1884. 



Phillipsia laticaudata, H. Woodw. Pal. Soc. Mon. Carb. Trilob. part ii. 1884, 

 p. 42, pi. vii. fig. 4. 



Head imperfect ; glabella tumid, rounded in front, with a narrow, 



smooth, raised marginal rim ; general surface smooth, but finely 



j)unctated under a lens ; basal lobe separated by a deep semicircular 



furrow from the rest of the glabella, and with two short lateral 



1 Geol. Mag. 1883, p. 485. PI. XII. Fig. 5. 



