FROM THE CARBONIFEROUS FORMATION. 157 



segments more) being absent from the front end and a considerable number of segments at 

 the tail end. It presents a dorsal view of ten segments in the stouter part of the body, 

 enough however to show that it tapered somewhat toward the head and very considerably 

 behind the thickest portion of the body, so that the hinder portion seen is only half as 

 broad as the broadest, only six or seven segments distant ; the body has every appearance 

 of having been cylindrical ; the fragment is 55 mm. long and 18 mm. broad in the widest 

 part. The segments show a well arched transverse ridge on the anterior portion, which 

 seems generally to occupy much the largest part of the segments, but there is an irregular- 

 ity about this in the engraving which would seem to be defective ; as a whole they are from 

 three to four times as broad as long. The three rows of spines are clearly marked, partly 

 by the spines themselves and partly by the tubercles which mark their former origin ; these 

 show the rows to have been equidistant from one another, the subdorsal rows being as far 

 apart as either from the pleurodorsal ; the spines are preserved only in the lateral rows ; 

 these appear to be uniform, subcylindrical, nearly or quite half as long as the width of the 

 segments (counting to the forks of the spines), expanding at the tip and bearing a couple 

 of stout spinules, the hinder and longer of which is as long as the body of the spine, taper- 

 ing and pointed, directed slightly backward, and according to Westwood " evidently artic- 

 ulated" at the base ; the front and shorter spinule is short, tapering and pointed, directed 

 a little forward. There is no appearance of any basal thorns. 



This species may be easily distinguished from A. major by its decidedly more tapering 

 body, comparatively shorter and broader segments and the character of the spines, which 

 not only appear to lack the basal thorns, but are very unequally forked at the tip. 



The specimen comes from the carboniferous rocks (ironstone ?) of Coalbrook Dale in Eng- 

 land, and is in the Hope collection at Oxford. 



Genus Euphoberia. (lu, <pop$ P 6<;.) 



Euphoberia Meek and Worthen, Am. Journ. Sc. Arts, (2), XL VI, 25 (1S68). — lb., Geol. 

 Surv. 111., Ill, 556. 



Spines spinuliferous, but with a single pointed tip, and arranged in subdorsal and lateral 

 rows only ; segments less than three times, generally about twice, as broad as long, rarely 

 less than twice as broad as long, and then only upon a few segments of the body. 



Euphoberia ferox. 



PI. 12, fig. 23. 



Eurypterus ? (Arthro])leura) ferox Salter, Quart. Journ. Geol. Soc. Lond., XIX, 

 86-87, fig. 8 on p. 84. 



Eurypterus ? (Euphoberia) ferox (pars) Woodward, Geol. Mag., X, 109, fig. 8 on p. 

 105. — lb., Mongr. Merost., 172, fig. 62 (1872). 



Half a dozen segments of the body, seen from above, are all that are preserved of the 

 single known specimen of this animal. The body is equal throughout, but is perhaps broader 

 than high, subcylindrical according to Salter, the surface rugose. Each of the segments is 



