EEVISION OF PALEOZOIC STELLEROIDEA. 153 



is complete and fixed throughout the rays, he would lay great value 

 on the character. It may be said that in the earliest Asteroidea the 

 chronogenetic tendency is from sUght alternation to complete and 

 fixed opposite arrangement among the ambulacral ossicles. 



PALASTERINA PRIM^VA (Forbes). 



Uraster primxviis Forbes, Mem. Geol. Surv. Great Britain, vol. 2, pt. 2, 1848, 

 p. 463; Mem. Geol. Surv. United Kingdom, dec. 1, 1849, p. 2, pi. 1, figs. 

 2a, 26; in McCoy, Brit. Pal. Foss., 1851, p. 60. — Murchison, Siluria, 1854, 

 p. 221, fig. 39. 



Palasterina primsevus McCoy, Brit. Pal. Foss., 1851, p. 59 (nomen nudum). — 

 Salter, Ann. Mag. Nat. Hist., ser. 2, vol. 20, 1857, p. 327, pi. 9, figs. 2a-2c.— 

 Wright, Mon. British Foss. Echinod., Oolitic, vol. 2, pt. 1 (Paloeontogr. 

 Soc. for 1861), 1862, p. 26, fig. 16a.— Quensted, Petrefactenkimde Deutsch- 

 lands, vol. 4, 1876, p. 74, pi. 92, fig. 35. — Stxjrtz, Verh. naturh. Ver. preuss. 

 Rheinl., etc., vol. 50, 1893, p. 44; vol. 56, 1900, pp. 214, 224.— Schondorf, 

 Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 63, 1910, p. 220. 



Palscasterina primxva Gregory, Geol. Mag., dec. 4, vol. 6, 1899, p. 349. — Spen- 

 cer, Mon. Brit. Pal. Asterozoa, pt. 1 (Palasontogr. Soc. for 1913), 1914, pp. 

 37, 38, fig. 30. 



Formation and locality. — A common species in the Ludlow rocks. 

 Underbarrow, Kendal, Westmoreland, and Leintwardine, Shropshire, 

 England. 



Remarks. — Dr. Bather furnished the author with wax squeezes of 

 specimens Nos. E4990-E4993 (E61 is quite another species and 

 abactinally more closely related to Hudsonaster) in the British 

 Museum (Natural History). They are from the Lower Ludlow at 

 Kendal, Westmoreland. These show little of value abactinally, but 

 actinally are well preserved along the ambulacra. Unfortunately, 

 however, none of the marginals are present and but Httle of the 

 interbrachial areas. When better material is at hand a comparison 

 should be made also wath Lindstromaster antiquus (Hisinger), as the 

 two look suspiciously alike. 



PALASTERINA BONNE YI Gregory. 



Palseasterina bonneyi Gregory, Geol. Mag., dec. 4, vol. 6, 1899, pp. 349, 350, 

 text figs. 1-3, and pi. 16, figs. 2a, 2b. — Schondorf, Jahrb. nassauisch. Ver. 

 Naturk., Wiesbaden, vol. 63, 1910, p. 223. 



"This species has hitherto been included in P. 'primseva, the type- 

 species of the genus, from which it differs by having shorter and 

 blunter rays, more numerous actinal interbrachial plates, and more 

 adambulacral plates in each series ; the character of the abactinal ray 

 plates is also different in the species, the longitudinal scries being 

 widely separated at the proximal end of the rays in P. bonneyi '^ 

 (Gregory). 



Formation and locality. — Ludlow shales. Leintwardine, Shrop- 

 shire. Types in British Museum (Natural History). 



