170 ROYAL SOCIETY OF CANADA 



shorter mesian ridge of the interior of iho dorsal valve. From L. sagit- 

 talis Salt ^ it is distinct by the shorter mesian ridge of the dorsal, and the 

 absence of a bilinear furrow of the interior of the ventral valve. It is 

 nearer to Z/. Belti Dav.- especially in the markings of the interior of the 

 dorsal valve, but even here the posterior muscles occupy a larger space, 

 and the bilinear groove of L. Belti is absent. 



OBOLELLA, Billings. 



A minute sheH, a ventral valve, which from the form and size ma}' 

 perhaps belong to this genus is found in the dark shales. It is about 

 2-|- mm. long and 2 mm. wide. The object is too defective for further 

 description. 



PEOTORÏHIS, Hall & Clarke. 



Several examples of a species of this genus or of Orthis were found 

 in phosphate nodules, all, however, too imperfect for descri])tion. 



OETHOTHECA, Novak. 



Fragments of a small species, oval in section, with a smooth interior, 

 occur in the phosphate nodules. 



HYOLITHES, F^ichwald. 



Eemains of two species wei-e observed, one with a diameter of about 

 8 mm, at the large end, and having fine, distinct, equal, arched trans- 

 verse strife on the dorsal side. This occurs in phosphate nodules. 



Another is a small species 8 mm. long and 2 mm. wide. It is found 

 in the black shales. Both species are too imperfect for further descri])- 

 tion. 



TKII.OBITA. 



AGNOSTUS, Brongniart. 



The forms of Agnostus preserved in the limestone bauds and dark 

 siliceous shales of Hastings Cove, show as clearly as do those of the 

 Andrarum limestone the development of this type of trilobite during the 

 time marked by the deposition of the Paradoxides beds. 



As in Sweden so in this country, the Limbatus section, so prominent 

 in all the lower sub-faunas, is poorly represented here (or absent, for we 

 have found no examples). The Longifrontes on tlie contrary are com- 



1 Earliest forms of Brachiopoda Geol. Mas-, London, Vol V., p. 309, PI. xv., figs. 

 17 to 24. 



2 Ibid., figs. 25 to 27. 



