268 CALIFORNIA ACADEMY OF SCIENCES. 



AGRAULOS. 



Arionelluf^ owexi Meek and Hayden; Pal. Upper Missouri, p. 9, figs, 

 a, b, c, pi. 1, fig. 4. Referred by Walcott, 1884, Pal. Eureka 

 Dist., Mou. U. S. Geol. Survey, vol. 8, p. 5.5, pi. 10, to Pty- 

 choparia oiveni. 

 Arionellus (Baihynriis) planus Shum., 1861; Am. Jour. Sci., 2d 

 series, vol. 32, j). 219. Morgan's Creek, Burnet county, Texas. 



Taconic. 

 Arionellus pustulatu.s Wal., 1877; Advanced sheets 31st Eep. New 



York State Mus. Nat. Hist., p. 15. Chazy, N. Y. 

 Arionellus pustulatus Wal., 1877; 31st Eep. New York State Mus. 



Nat. Hist., p. 68,. 

 Arionellus quadrangulaeis Whit., 1884; Bull. Mus. Nat. Hist, New 

 York, vol. 1, p. 147, pi. 14, fig. 8. Braintree, Mass. Taconic. 



■ quadrangularis Wal., 1884; Bull. U. S. Geol. Survey, No. 10, p. 48, 



pi. 7, fig. 1. 



REDPATHi Wal., 1891; 10th Eep. U. S. Geol. Survey, p. 654, fig. 69. 



St. Simonds, Quebec. Taconic. 



• sociALis Bill., 1874; Pal. Foss., vol. 2, p. 71 fig. 40. Chapel Arm., 



Trinity Bay, N. F. Taconic. 



SOCIALIS Bill., 1882; Eep. of Progress Geol. Survey Newfoundland, 



p. 10, fig. 4. 



soriALis Matt., 1886; Trans. Royal Soc. Canada, vol. 2, p. 151, fig. 1 



a-b. 



STRENUUS Bill., 1874; Pal. Foss., vol. 2, p. 71, fig. 41. Topsail Head 



and Brigus, Conception Bay. Taconic. 

 STRENCTiTS Bill., 1882; Rep. of Progress Geol. Survey of Newfound- 

 land, p. 10, fig. 5. 



STREXUUS Matt., 1886; Trans. Eoyal Soc. Canada, vol. 2, p. 153, figs. 



3, 3 a-b. 



STRENUUS Wal., 1891 ; 10th Rep. U. S. Survey, p. 655, pi. 96, figs. 1 a-c; 



also, var. nasuius, p. 654, pi. 97, figs. 2, 2 a-c. Olenellus zone. 

 Walcott refers Pti/choparia mucronatus S. & F. to this species. 

 Matthew uses the species for the type of the subgenus Strenuella, 

 Trans. Roy. Soc. Canada, 1886, p. 154. 



suhclavatus Bill. (See Ptychaspis suhclavatus.) 



Arionellus (Bathyurus) texanus Shum., 1861; Am. Jour. Sci., 2d 

 series, vol. 32, p. 218. Clear Creek, Burnet Coiinty, Texas. 



Taconic. 



Arionellus tripcnctatcs Whitf., 1876; Rep. Recon. Upper Missouri, 



p. 141, pi. 1, figs. 3-5. Moss Agate Springs near Camp Baker, 



Montana. Taconic. 



? WHITFIELDIANCS Matt., 1887; Trans. Roy. Soc. Canada, vol. 5, i>. 130, 



pi. 1, figs. 1, 1 a-f. 



