OLENELLUS AND OTHER GENERA OF MESONACIDvE 34I 



Formation and Locality. — Lower Cambrian: (25) dark, sili- 

 ceous shales at Parkers quarry near Georgia, Franklin County, 

 Vermont. 



(8q) drab and gray calcareo-argillaceous and arenaceous shales 

 2 miles (3.2km.) northwest of the city of York; (49) sandstone 

 on Codorus Creek, ]4. niile (.2 km.) below Meyers Mill, near Emigs- 

 ville ; and (493) sandstone on the Liverpool Road, sonth of the 

 Schoolhonse 3 miles (4.8km.) northwest of York; all in York 

 County. Pennsylvania. 



OLENELLUS ?? WALCOTTI (Shaler and Foerste) 

 Plate 24, Fig. ii 



Paradoxidcs zi.'alcotfi Shaler and Foerste, 1888, Bull. Museum Comp. 



Zool., Whole Series, Vol. 16, No. 2 (Gaol. Series, Vol. 2), pp. 36-37, 



pi. 2, fig. 12. (Described and discussed. The specimen represented by 



figure 12 is redrawn in this paper, pi. 24, fig. 11.) 

 Olcnellus ivalcotti (Shaler and Foerste), VValcott, 1891, Tenth Ann. Rept. 



U. S. Geol. Survey, pp. 62,6-62,7, pi. 88, fig. 2. (Reproduces figure and 



description of Shaler and Foerste [1888, pp. 36-37, pi. 2, fig. 12], and 



refers species to Olenclhis. 

 Olenellus zvalcotti (Shaler and Foerste), Grabau, 1900, Occasional Papers, 



Boston Soc. Nat. Hist., No. 4, Vol. i, pt. 3, p. 669. (Mentioned.) 



Nothing has been added to our knowledge of this species since 

 my paper of 1891. There is not sufficient material to identify it 

 with EUiptoccphala asaphoides Emmons, nor to positively decide 

 that it is not identical. The cephalon on which the species is 

 founded was found in a stratum of rock carrying six species that 

 are associated with E. asaphoides in Rensselaer and Washington 

 counties, New York, namely : Fordilla troyensis, Stenotheca rugosa, 

 Platyceras primcei'um, Hyolithes communis emmonsi, H. americanus, 

 and Hyolithelhis micans. 



Formation and Locality. — Lower Cambrian: (3260!) reddish- 

 brown arenaceous shale near North Attleboro, Bristol County, Mas- 

 sachusetts. 



OLENELLUS ?, sp. undt. 



Olenellus sp., Moberg, 1892, Om Olenellusledet i sydliga Skandinavien, p. 



4. (Occurrence mentioned.) 

 Olcnellus ? sp. n., Moberg, 1899, Geol. Foren. i Stockholm Forhandl., Bd. 



21, Hafte 4, pp. 338-339, pi. 15, figs. 18-19. (Preceding reference copied 



and species discussed.) 



Fragments of a species of trilobite that in some respects resembles 

 Mesonacis torelli [pi. 26, figs. 5-18] are mentioned by Dr. Moberg 

 8— \\- 



