BELLINURUS KCENIGIANUS. 243 



oar shores at the present day, where it is generally attached to sea-weeds, and is well 

 known as Spirorbis na,utiloides. These little spiral bodies of the Coal-measure plants 

 have, however, been described by Goppert as a fungus under the name of Gyromyces 

 ammonia, and are figured by Geinitz in his fine work on the Coal-plants of Saxony. 

 We have here, therefore, an instance of the great caution required in drawing general 

 conclusions from insufficient data, and would rather concur with the remarks offered on 

 the subject at p. 54 of this journal, believing that the Coal-measures afford evidence of 

 having been deposited under both freshwater and marine conditions. 



" The discovery of these peculiar Coal-measure Crustacea in Ireland, with associated 

 shells and plants corresponding so remarkably with those found in similar deposits at 

 Coalbrook Dale, in Shropshire, and other parts of the midland counties in England, is a 

 point of great palaeontological interest, showing their distribution over a wide area, and 

 indicating the prevalence of the same condition in both counties, although at localities so 

 widely distant." 



Species 5.— BELLINURUS KCENIGIANUS :— H. Woodw., 1872. PL XXXI, 



figs. 3 c and 4. 



Bellinurus Konigiancs, H. IVoodw. Geol. Mag., 1872, vol. ix, pi. x, fig. 8, p. 439. 



This new form was obtained from the Dudley Coal-field, and is quite distinct from 

 the type-species B. bellulus, Konig. 



The angles of the carapace are blunt, and not produced into long spines, and the five 

 free thoracic somites terminate in obtuse serrations, not in recurved spines, as in 

 B. bellulus. The thorax also is relatively broader in proportion to the head ; the axis of 

 the body is strongly arched and nearly straight, and does not diminish gradually towards 

 the posterior extremity, as in the other species, although the pleurae themselves contract 

 to half their breadth from the first to the fifth segment. The raised circular border of 

 the glabella is not so distinctly defined as in B. bellulus, but the central axis is more 

 strongly marked. The eyes are not very well seen, but they occupy the same relative 

 position on the margin of the raised glabella, as in B. bellulus. 



The abdominal division consists, as in the other species, of three coalesced segments, 

 which are, however, only indicated by three marginal serrations. 



The tail-spine (telson) is not preserved, but its articulation with the abdomen is 

 strongly marked. 



Greatest length of entire body, 9 lines ; greatest breadth of head-shield, 1 inch ; 

 length of five free thoracic segments, 3 lines ; breadth of first free thoracic segment, 

 10 lines ; breadth of fifth free thoracic segment, 5 lines ; breadth of central axis of body- 

 segments, 2-| lines. 



