18 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.7« 



together the evidence from the different specimens, the following description can 

 be given. 



Head-shield transverse, more than twice as wide as long. Glabella broadly 

 semioval to subquadrate, nearly as wide as long, narrowing a little anteriorly, 

 strongly convex, rounded in front. Occipital furrow slightly arched forward 

 in the middle or straight ; occipital segment simple. Axial furrows sharp, mod- 

 erately strong, slightly convergent anteriorly. Cheeks much lower and less 

 convex than the glabella, almost horizontally extended or slightly arched down 

 on each side, of rounded or subtriangular shape, nearly as broad as long, 

 surrounded by a flattened border, which broadens gi'adually to the middle, 

 then decreases in width until it merges into the narrow anterior border in 

 front of the glabella. Marginal furrow sharp, but not deeply impressed. 

 Glabella and cheeks minutely tuberculated. 



Dimensions. — Length=about 3 millimeters ; width=about 6.5 millimeters. 

 . Remarks. — This species seems almost indistinguishable from T. hicuspis, 

 Angelin, but no pair of anterior spines has been observed in any of our speci- 

 mens. The shape of the glabella, relatively wider cheeks, and absence of a 

 median occipital spine distinguish it from T. fractus,^iirr., which I have de- 

 scribed [see T. reedi, n. sp., p. 19] from the Whitehouse Group in the Girvan 

 district. 



Judging from the quoted description and figure.^ reproduced here 

 in Plate 2, this species differs from all other Telephidae now known 

 in the relative narrowness and parallel-sidedness of the glabella and 

 the great median width of the fixed cheeks and nearly symmetrical 

 curvature of their outer edges. The slight differences in these re- 

 spects shown in Reed's figures of two cranidia may be accounted for 

 by assuming that the original of his Figure 10 (reproduced here as 

 fig. 18 in pi. 2) suffered some distortion by longitudinal compres- 

 sion, causing shortening of the glabella and cheeks and obtuse median 

 angulation of the outline of the latter. Accordingly, I am inclined to 

 regard his Figure 11 as probably a closer approximation to the un- 

 distorted original form of the cranidium. Reed probably is right in 

 suggesting that his species is a close relative of the Norwegian T. 

 hicuspis Angelin. However, this probable relationship is indicated 

 much better by comparison with Angelin's figures of his species 

 than with the figures of Swedish specimens referred to T. hicuspis 

 by Hadding. The probability that Hadding misidentified Angelin's 

 species is discussed on page 12. 



Reed says that the anterior spines were not observed in his speci- 

 mens. Most probably they are directed sharply downward as they 

 are figured by Angelin in his T. hicuspis and as they do in T. gela- 

 sinosus and other American species of the typical section of the 

 genus. In most of these cases delicate preparation of the specimens 

 is required to reveal their presence, for even their bases are seldom 

 shown in natural fracturing of the matrix. 



O ccurrence. ^Tourmakeadj Beds, near Tourmakeady, County 

 Mayo, Ireland. According to a report on this district by Gardiner, 



