H. Woodward — Notes on Talceozoic Crustacea. 439 



species, also from this classical locality, is figured in Buckland's 

 Bridgewater Treatise in 1836,^ under the name of Limulus trilohitoides. 



In a paper contributed to the " Annals and Magazine of Natural 

 History" for February, 1863, vol. xi,, p. 107, Mr. William Hellier 

 Baily, F.G.S., gives an interesting account of the fossil Limuli, and 

 defines Konig's genus Bellinurus bellulus, so that we may for the 

 future adopt that name as the earliest.- Mr. Baily thus defines 

 Bellinurus bellulus, Konig : " General form suborbicular. Head or 

 cephalic shield semicircular, slightly arched ; the central portion (or 

 glabella) prominent and declining towards the circumference, sur- 

 rounded with a flattened margin, and terminating at its posterior 

 angles in long spines. Body ^ composed of five segments, which 

 terminate in spines and diminish gradually towards the posterior 

 extremity. Tail,* or caudal portion, small, with a few slight radi- 

 ating divisions, to which is articulated an elongated spine (telson)." 



Mr. Baily describes two new species of Bellinurus in his paper, 

 namely : — 



Bellinurus regince, Baily, Coal M., Bilboa Colliery, Queen's Co., 

 Ireland. 



Bellinurus arcuatus, Baily, Coal M. (loc. cit.) 



In a communication made by me to the Geological Society in 

 1867, on the structure of the Xiphosura, already cited, I proposed 

 to retain those forms of palgeozoic Limuli with free and movable 

 thoracic somites, and anchylosed abdominal ones, in the genus Belli- 

 nurus, and I referred those in which all the segments appeared to 

 be anchylosed, namely (Limulus) anthrax, and (L.) rotundata, to 

 the genus PrestwicMa. 



In all these species the body consists of a head-shield, five free, or 

 anchylosed, thoracic segments, and three anchylosed abdominal ones. 

 I have now to record two new forms of Limuli from the English 

 Coal-measures. 



1. Bellinurus Konigianus, H. Woodward, sp. nov., PI. X., Eig. 8. 

 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 dis- 



' Bridgewater Treatise on Geology an dMineralogy, vol. i., p. 396 ; toI. ii., p. 77, 

 pi. 46", fig. 3. 



2 Buckland's Limulus trilohitoides (1836), in consequence, becomes a synonym of 

 Konig's Bellinurus helluhts (1820). 



3 Defined by the writer as the Thoracic series of segments. 



* The rudimentary Abdominal segments coalesced. See memoir " On some points 

 in the structure of the Xiphosura, having reference to their relationship with the 

 Eurypteridm," by H. "Woodward, Quart. Journ. Geol. Soc, 1867, vol. xxiii., p. 28, 

 pi. i. and ii. 



