224 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. 



Jaekel here again fails to diagnose his genus, but some of the 

 characters can be clearly made out from his excellent drawing. 

 The disk is small and tends to have convex interbrachial areas. So 

 far as the oral disk area is concerned, the general structure is that 

 of Eophiura, with this marked difference the opposite and asterid- 

 like ambulacralia of the rays do not vanish proximally as in that 



genus but crowd over and finally 

 rest wholly upon the adambulacrals, 

 and end against the distal edges of 

 the syngnaths . These are made up 

 of the coossified terminal adambu- 

 lacral ossicles. 



Genus PROTASTER Forbes. 

 Text fig. 23. 



Protester FORBES, Mem. Geol. Surv. 

 United Kingdom, dec. 1, 1849, pi. 

 4, pp. 1-2; in McCor, British Pal. 

 Foss., 1851, p. 60. MURCHISON, 

 Siluria, 1854, p. 221, fig. 39-4. 

 SALTER, Rep. Twenty-sixth Meet., 

 Brit. Assoc. Adv. Sci., Notices and 

 abstracts, 1857, p. 76; Ann. Mag. 

 Nat. Hist., ser. 2, vol. 20, 1857, pp. 

 325, 330 HALL, Nat. Hist. N. Y., 

 Pal., vol. 3, 1859, p. 134. SALTER, 

 Ann. Mag. Nat. Hist., ser. 3, vol. 8, 



1861, p. 484. WRIGHT, Mon. Brit- 

 ish Foss. Echinod., Oolitic, vol. 2, 

 pt. 1 (Palseontogr. Soc. for 1861), 



1862, pp. 23, 31. HALL, Twentieth 

 Rep. N. Y. State Cab. Nat. Hist., 

 1868, p. 293; rev. ed., 1868=1870, 

 p. 335. QUENSTEDT, Petrefacten- 

 kunde Deutschlands, vol. 4, 1876, 

 p. 133, pi. 95, fig. 11. STURTZ, N. 

 Jahrb. fiir Min., etc., 1886, vol. 2, 

 pp. 148, 150. GREGORY, Geol. 

 Mag., dec. 3, vol. 6, 1889, p. 26. 

 ST^RTZ, Verh. naturh. Ver. preuss. 

 Rheinl., etc., vol. 50, 1893, p. 18. 

 J. F. JAMES, Journ. Cincinnati Soc. 



Nat. Hist., vol. 18, 1896, p. 137. GREGORY, Proc. Zool. Soc. London for 1896, 

 1897, p. 1031, fig. 1. WHIDBORNE, Palseontogr. Soc., 1898, p. 206. PARKS, 

 Trans. Canadian Inst., vol. 8, 1908, pp. 363, 366. SCHONDORF, Jahrb. nas- 

 sauisch. Ver. Naturk., Wiesbaden, vol. 63, 1910, p. 238. SOLLAS and SOLLAS, 

 PMlos. Trans. Roy. Soc. London, ser. B, vol. 202, 1912, p. 223. SPENCER, 

 Mon. Brit. Pal. Asterozoa, pt. 1 (Palseontogr. Soc. for 1913), 1914, p. 35. 



Encrinaster (part) HAECKEL, Gen. Morphologie, vol. 2, 1866, p. Ixvii (no definition). 



Also Bee Sturtzura. 



FiG.21. VENTRAL VIEW OF A RAY OF BOHEMURA 



JAHNI, ENLARGED ABOUT X 2, AFTER JAEKEL. 



a, AMBULACRALIA; ad, AD AMBULACRALIA WITH 



THEIR LATERAL EXTENSIONS; ddm, SYNGNATHS. 



