426 SAMUEL H. SCUDDER ON NEW 



TABLE or THE SPECIES OF EUPHOBERIA. 

 Body stout. 



Very large species, with large bristling spines ha\'ing large basal spinules. 



Largest of all, with spines like Acantk. major but more deeply forked, not very divergent and witli basal 



spinules both anterior and posterior E. hystricosa. 



Smaller with more delicate spines and only posterior basal spinules E. horrida. 



Ordinary sized species with more delicate compound spines, the basal spinules not so highly developed. 

 Spines long ; spinules highly developed. 



Surface sculpture delicate; body largest on segments 12-18, tapering gradually each way E. armigera. 



Surface sculpture coarse ; great contrast in elevation of subscgments E. grauosa. 



Spines either very short with highly developed spinules, or long with very slightly developed spinules. 

 Body with broadly rounded hinder extremity. 



Hinder half of body much smaller than front half, the change sudden ... E. carri. 



Hinder half of body gradually tapering and not strikingly diflerent in the two halves E. cuspidata. 



Body with hinder extremity abruptly tapering to a blunt point E. flabellata. 



Ordinary sized species with simple spines E. spinulosa. 



Body slender and long drawn out. 

 Nearly uniform throughout. 



Segments at least half as broad again as long. E. simplex. 



Segments hardly broader than long E. tracta. 



Delicately tapering so as to be less than half as broad at tail as in front E. anguilla. 



Euphoberia hystricosa sp. nov. 

 Pi. 33, figs. 1, 3. 



Unfortunately but a small fragment of the single known specimen is preserved, but 

 this is so characteristic as to leave no doubt of its relations. Seven adjoining segments 

 from near the middle of the body appear on the small nodule, all of the same size and 

 showing a dorsal aspect. The segments are about two and a half times broader than 

 long, and the shorter anterior portion is considerably elevated and bears near its outer 

 limit a boss which represents the base of a spine belonging to the subdorsal series; the 

 spines themselves are broken oif, but those of one of the lateral series appear, and are 

 exceedingly large and formidable. They are very stout and very long, nearly as long 

 as the entire breadth of the body and apparently dejDressed, forked a little beyond the 

 middle, the forks only slightly divergent and subequal, lying in the same plane as the 

 body of the spine, the anterior the longer, stouter and blunter, and scarcely bent forward 

 from a continuation of the basal part of the spine. Besides this, there is at the base, 

 ajoparently clearly separated in all instances from the great spine, but in close jiroxim- 

 ity to it, a slender spinule anterior and another posterior also hang in the same plane, 

 but shoAving no signs of depression. 



Length of the fragment, 46 mm.; of the single segments, 5.5 mm.; bi-eadth of same, 

 14 mm.; length of spines, 13 mm.; width at base, 1.75 mm.; length of spinules, 3 mm. 



The species closely resembles in general efiect Acantherpestes major, but there are no 

 pleurodorsal series of S])ines, and therefore it cannot fall into that genus. No species of 

 Euphoberia at all resembles it, or can compare with it in size, excepting the European 

 E. ferox, which ditfers entirely in the shape of the spines at base, and in lacking the an- 

 terior ridge upon which the subdorsal spines are mounted. The spines of this species 

 closely resemble those of Acantherjyestes major, and agree with them in size, but they 

 differ in the great depth of the apical foi-k, as well as in minor points. 



The nodule comes from Mazon Creek, 111., and was sent to me for study by Mr. R. D. 

 Lacoe, in whose collection it bears the number 18()2ab. 



