REVISION' 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 slight alternation to complete and 

 fixed opposite arrangement among the amhulacral ossicles. 



PALASTERINA PRIM^EVA (Forbes). 



Uraster primxvus 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 primxvus 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 (Palseontogr. 

 Soc. for 1861), 1862, p. 26, fig. 16a. QUENSTED, Petrefactenkunde Deutsch- 

 lands, vol. 4, 1876, p. 74, pi. 92, fig. 35. STURTZ, 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. 



Palszasterina primseva GREGORY, Geol. Mag., dec. 4, vol. 6, 1899, p. 349. SPEN- 

 CER, Mon. Brit. Pal. Asterozoa, pt. 1 (Palseontogr. 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 Eudsonaster) 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 little of the 

 interbrachial areas. When better material is at hand a comparison 

 should be made also with Lindstrb'master antiquus (Hisinger), as the 

 two look suspiciously alike. 



PALASTERINA BONNEYI Gregory. 



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

 text figs. 1-3, and pi. 16, figs. 2a, 26. 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 series 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). 



