112 Mr. W. H. Baily on new Species of Coal-measure Crustacea 



Caudal extremity small, with two or three radiating divisions, to 

 which is appended a spine about equal in length to the head 

 and body. 



Remarks. — This Crustacean differs from the preceding one in 

 having much shorter spiny terminations to the pleura?, and a much 

 shorter tail-spine. The detached head or cephalic shield (PI. V. 

 fig. 2 A, B) is more orbicular, and the arched ridges proceeding 

 from the middle portion of the head (glabella) terminate on each 

 side in short spines — a character not observed in any of the 

 specimens of B. Regince. I have not succeeded in obtaining 

 good specimens of this species with the body and tail entire : 

 an imperfect one (fig. 2 C) forms the centre of a concretion in 

 the shale, and exhibits a portion of the body with the tail-spine 

 uncompressed, showing distinctly the division of each thoracic 

 ring, with its grooved lateral angles as in the Trilobites. In 

 another specimen, which was accidentally relieved from the 

 shale, exposing both sides, the body was found to be doubled 

 back upon the head, like an Ampyx or Trinucleus. This species 

 is allied to Belinurus bellulus, Konig, but differs from it in the 

 more orbicular form of the head, the spiny terminations of the 

 pleurse, and the greater proportion of the body to the cephalic 

 shield. 



Total length 1 inch, or 25 mill. 



„ breadth 11 lines, or 22 „ 



Length of body 7 „ 15 „ 



Breadth of cephalic shield 8 „ 17 „ 



Length of cephalic shield 4 „ 8 „ 



,, telson, about i inch 12 „ 



Locality. — Found with the previous species at Bilboa Colliery, 

 Queen's County. 



A third species, closely allied, if not identical, with Belinurus 

 (Limulus) rotundus, Prestwich, sp., was also obtained at the same 

 locality ; but as it is scarcely perfect enough for description, I 

 have preferred referring it, with a doubt, to that species. A 

 figure, of the natural size and enlarged, is given on Plate V. 

 fig. 3 A, B. 



The following is a list of the species of Belinurus, with their 

 synonyms and localities : — 



1. Belinurus bellulus, Konig, Icon. Foss. Sect. pi. 18. fig. 230. 

 Coal-measures, Coalbrook Dale, Shropshire. 



Syn. Entomolithus (monoculus) lunatus, Martin, Pet. Derb. pi. 45. 

 fig. 4. Near Mansfield, Nottingham. 



, Parkinson, Org. Rem. vol. iii. pi. 17- fig. 18. 



Dudley, Shropshire. 

 Limulus trilobitoicles, Buckland, Bridg. Treat, pi. 46". fig. 3. 



, Prestwich, Geol. Trans, ser. 2. vol. v. pi. 41. fig. 8. 



? Portlock, Geol. Report, pi, 24. fig. 11. 



