438 H. Woodward — Notes on Palceozoic Crustacea. 



sures 1 J inches in breadth and 1 inch in lena-th 



elongated tubercles arise and radiate outwards to the border of the 

 shield. The surface of the carapace between the tubercles is finely 

 granulated, with here and there a slightly larger pimple upon its 

 surface. Eyes not visible. 



There are some other fragments which may indicate another 

 species (see Plate X. Fig. 3), but they are too fragmentary for deter- 

 mination, and I therefore think it best merely to notice them in 

 passing. 



Formation. — Wenlock shale, Dudley. The specimen is preserved 

 in the British Museum. 



Species 4. — Hemiaspis Salweyi,^ Salter, Plate X. Pig. 4. 

 This species is represented by two head-shields only ; the body- 

 segments, like those of the preceding species, are not preserved. The 

 carapace, which'is very tumid, is nearly circular in outline, and mea- 



The posterior border 

 of the glabella is armed with two 

 large spines, 3 lines in length and 4 

 lines apart, whilst three smaller ones, 

 also directed backwards, are ar- 

 ranged on either side of the genal 

 border. The surface of the cara- 

 pace is covered with a minute gran- 

 ular ornamentation ; the raised cen- 

 tral portion is flanked by a border 

 of somewhat elongated tubercles ; 

 within the central area are three or 

 four rounded tubercles arranged in 

 two oblique rows about four lines 

 apart, commencing on the posterior 

 border of the head at the base of the two large spines ; one central 

 prominent tubercle and two lesser lateral ones on the front of the 

 glabella, complete the ornamentation of the head-shield. The spot 

 marked e on the subjoined Woodcut (Pig. V), near the latero-anterior 

 border of the raised glabella, probably indicates the position of the 

 eye. There is a slight indication of costae on the front border of the 

 head. 



Forination ; — Upper Ludlow, near Ludlow (Mus. Praot. Geology, 

 Jermyn St.) ; Lower Ludlow, Ledbury (British Museum). 



Fig. 1. — Head-shield of Hemiaspis 

 Salweyi, Ssdtei. (Restored.) U.Xudlow, 

 near Ludlow. 



Sub-order Xiphosura, Gronovan, 1764. Genus Bellinurus, Konig. 



The name Bellinurus^ was applied by Mr. Charles Konig, in 

 1820,' to a small form of Limulus from the Coal-measure Iron- 

 stone of Coalbrook Dale, Shropshire. The fossil was, however, 

 unaccompanied by any description. Another specimen of the same 



1 Hemiaspis Salweyi, Salter, 1865. Lowry's Chart of Fossil Crustacea. 



2 From jSe'Aoy a dart, and ovph. the tail. 



" Konig, Icones FossQium Sectiles, Centuria Secunda, pi. xviii., fig. 

 (Loudon, 1820.) 



230. 



