CRUSTACEA. ' 77 



The type of Lichas superbus, Billings, is a specimen of average dimensions, 

 preserving both cephalon and pygidium, and agrees in every essential feature 

 with the type of Lichas grandis. 



Distribution. Upper Helderberg group. Schoharie grit: Schoharie, Scho- 

 harie county: Thompson's Lake. Knox and near Clarksville, Albany county. 

 Upper Helderberg limestone: Cayuga, Province of Ontario. 



[s.-g.] CONOLICHAS, Dames. 1877. 

 Lichas (Conolichas) hispidus, n. sp. 



PLATE XIX A, FIGS. 14, 17, 18. 

 Acidaspis [Terataspis) Ehiopis, Hall. Illustrations of Devonian Fossils, pi. xix. figs. S. 9. 1876. 



The pygidium, which is the only portion of the animal observed, presents in 

 general proportions, a close similarity to pygidia referred to the species 

 Lichas Eriopis. The marginal spines in L. hispidus are shorter and stouter. 

 the terminal spine or lobe quite small but distinct, and the axial node ele- 

 vated, but without a spine : the pleuras are covered with rows of coarse and 

 fine tubercles, without spines. In a single specimen the axis bears as many 

 as four transverse rows of tubercles, representing annulations. The type 

 specimen of this species is from the Schoharie grit, and in the Illustrations 

 of Devonian Fossils {he. cit.), was provisionally referred to L. Eriopis. The 

 finding of pygidia in the Upper Helderberg limestone, similar in all the 

 above particulars, seems to establish this form as a distinct variation, which 

 may be tentatively accorded a specific value. 



Dimensions. In two specimens the length is to the width as 9 to 16 mm. 

 and as 18 to 30 mm. 



Distribution. Upper Helderberg group. Schoharie grit: mar Clarksville, 

 Albany county; Corniferous limestone: LeRoy, Genesee county. 



