FOSSILS OF THE CLINTON GROUP. 529 



granules and the finer interspersed ones along the margins of the glabella, 

 though this may partly be due to the state of preservation in a limestone 

 cement. The generic reference is tentative. 



Lichas breviceps, Hall. 



(Plate 25, Figs. 26 a, b, c, d, e ; Plate 27, Figs. 18, 19.) 



This species occurs in the Ohio Clinton limestone at Brown's Quarry, 

 common (glabellae sometimes 22mm. long); Soldiers' Home, rare; 

 Fauver's Quarry, a glabella; in the "Orthoceras block" from Huffman's 

 Quarry; upper shaly courses at Huffman's Quarry, several specimens; Fair 

 Haven, a glabella; Hanover, Indiana, rare. A careful study of the head of 

 the typical forms of Lichas breviceps from the Niagara of Waldron, Indiana, 

 was prepared for the Bulletin of Denison University vol. Ill, plate XIII, fig. 

 21. An entire head was found in the above mentioned " Orthoceras block." 

 It presents all the features of the Waldron head with one exception. In 

 the occipital furrow T — between the postero-lateral lobes of the glabella the 

 occipital segment, and the area posterior to the eye — lies, in the case of 

 this as well as all other Clinton specimens, a transversely oblong, very 

 distinct, and fairly large lobe, represented in the case of the Waldron 

 specimens only by a very slight ridge. When it is desired to distinguish 

 this Clinton form from its Niagara descendant the varietal name Clinto?i- 

 ensis may be used. The Clinton pygidia show no distinctions. The 

 hypostoma is frequent at Brown's Quarry. 



A somewhat shorter type of hypostoma is represented by a single 

 specimen from Soldiers' Home. Plate 27, Fig. 11. It belongs to some 

 distinct species. 



In the limestone at Soldiers' Home was found also a glabella, having 

 all the parts very strongly accentuated. This gives it an aspect quite 

 distinct from the ordinary species. Possibly it represents only a cast of 

 the lower side of the more ordinary form, but the convexity of the middle 

 and lateral lobes of the glabella, and of the lobes in the occipital groove 

 is so strongly marked that it may belong to a distinct species. The ma- 

 terial will not permit us to determine. It bears a strong resemblance to 

 Calymene phlyctainoides, Green, which, judging from the figures alone, 

 may also be some form of Lichas. (Plate 37A, fig. 15.) 



Phacops trisulcatus, Hall. 



( Plate 26, Fig. 3 ; Plate 27, Figs. 4, 20 21 ; Plate 31 Figs. 20, 21 ; ) 



This species was described from the Soldiers' Home quarries as Pha- 

 cops pulchellus (Bulletin of Denison University Vol. II). Later it was 

 identified at Cumberland Gap, Tennessee (Proc. of Boston Soc. Nat. 

 Hist., 1889.) In the "Orthoceras block" at Huffman's Quarry occurred 

 a pygidium quite similar to that elsewhere associated with this species. 



U G. O. 



