PTYCHOCARIS JASCHEI. 193 



Characters. — Style (telsou) broad, stout, and tapering ; shorter than the 

 stylets. The inner margin of the stylets is fringed with setee. 



2. Mesothyra ogeani. Hall and Glarl-e, 1888. 



DiTHTBOCAEis NEPTTJNi, Hall, 1870. Illustr. Devouiau Fosa., pi. xxii, figs. 1 — 5, 



pi. xxiii, figs. 1 — 3. 

 — — U., W., and J., 1888. Report Brit. Assoc, for 1887, 



p. 65. 

 Mesothtea oceani, Hall and Clarke, 1888. Geol. Surv. New York, Palreout., 



vol. vii, p. 187, pi. xxxii, figs. 1 — G ; pi. 

 xxxiii, figs. 1 — 7 ; pi. xxxiv, figs. 1 — 5. 



'Carapace-valve (including posterior spine) 140 mm. long, and 60 mm. 



wide. 

 Caudal plate and telson [style including head] 67 mm. long. 

 Size ■{ Cercopods [stylets] 70 mm. long. 



Carapace-valve 150 mm. long, and 6-5 mm. wide. ~\ 

 Style 72 mm. long ; wide at head, 24 mm. >■ As figured. 



-Stylets 84 mm. long ; wide at top, 13 mm. -^ 



Characters. — Stylets vary in length, but are longer than the style. Setge are 

 attached to the inner margin of the stylets. 



One Devonian specimen that has been referred to Ditliijrocarls may be here 

 noticed. 



Ptychocaris? Jaschei {F. a. Boomer, 18-5-5). Plate XXIX, figs. 15 a — c ; and 16 a, 5. 



DiTHTKOCAEis Jascuei, F. A. Eoemer, 1855. Palaeontographic.n, vol. v, p. 8, pi. ii, 



figs. 13«— c; and vol. xiii, 18GG, p. 219, referring to 

 Roemer's Beitrag III, pi. xvii [ii], fig. 13 (misspelt 

 Ditryocharis) . 

 DiTHYEOCAEis ? Jascuei, Kayser, 1878. Abhandl. Geol. Specialkarte von Preussen 



uud Thiiringischen Staaten, vol. ii. Heft 4, p. 7, 

 pi. i, figs. 13, 13 a. 



— Jaschei, J. M. Clarke, 1884. N. Jahrb., 1884, vol. i, p. 185. 



— ? — E , JV., and J., 188S. Report Brit. Assoc, for 1887, 



p. 66. 

 Ptychocaeis? Jaschei, £., W., and J., ISS9. (After Novak.) Rep. Brit. Assoc. 



for 1888, p. 124. 



26 



