24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 76 



ferred to and which suggested the species name hicornis is the pres- 

 ence of a pair of long and rather slender spines or horns at the top 

 or beginning of the frontal slope of the glabella. These spines pro- 

 ject obliquely forward, outward, and upward and have a length ap- 

 proximately equaling half the width of the glabella. The surface 

 is pustulated and the occipital spine well developed as in the men- 

 tioned species. The fixed cheeks differ slightly from those of T. pus- 

 tulatiis in their outlines and more particularly in being decidedly nar- 

 rower. The eyes, as usual, are very large and, disregarding the genal 

 spines, make up much the greater part of the free cheeks. The height 

 or width of the visual surface is to its length about as one to three. 

 In the middle third of the eye of an adult specimen about 23 facets 

 occur in each of the diagonally intersecting rows. The outer rim of 

 the cheek is narrow and prolonged at its widest point into a long, 

 straight, compressed, and obliquely striated genal spine. The base 

 of the latter lies somewhat behind the middle of the eye, projects 

 almost directly outward and attains a length slightly exceeding that 

 of the eye. The pygidium is obtusely triangular in outline, its axis 

 wide and high, clearly outlined, and crossed by three double rings, 

 each of which carries a pair of strong spinelike knots in its middle 

 third, some small tubercles outside of these, and a low swelling at 

 each end. The pleural lobes are narrow, the outer half broadly con- 

 cave, the inner half rising into a low ridge on which two segments 

 are obscurely indicated. 



Whereas the striking glabellar spines serve very satisfactorily 

 in distinguishing T. hicornis from all the other American species of 

 the genus and also from all but one of the European species, their 

 value as a distinguishing character fails when we compare it with 

 the similarly bicornute Swedish species to which Angelin applied 

 the name TeJephus granulatus^ especially as that species is illustrated 

 by Hadding. Indeed, when I first saw the latter's figures of T. gran- 

 ulatus I welcomed them as probably giving the first valid grounds 

 for the identification of an American species of Telephus with an 

 European one. This relation was suggested particularly by the 

 smaller cranidium shown in his Plate 1, Figure 9, which differs from 

 the larger, apparently more typical, example of the species shown in 

 Figures 8«, &, <?, in the straighter anterior outline of the cranidium 

 and the more conical and anteriorly more narrowly rounded glabella. 

 In both respects this smaller cranidium makes a closer approach to 

 the cranidium of T. hicornis than does the larger specimen. Pos- 

 sibly the noted differences are due to distortion by rock compression 

 or to differences in posing. Whatever the reason may be, whether 

 structural or fortuitous, careful comparison with the published fig- 

 ures of the Scandinavian species, including the one given by Angelin, 

 leaves no doubt as to the distinctness of the American bicornute 



