PALASTERINA. 219 



Genus PALASTERINA, McCoy. 



1848. Uraster, Forbes (pars), Mem. Geol. Surv. at. Brit., vol. ii, pt. ii, p. 463. 



1849. ,, Forbes (pars), Mem. G-eol. Surv. United Kingdom, dec. i, p. 2. 

 1851. Palasterina, McCoy, Brit. Palseoz. Foss., p. 59. 



1857. „ Salter, Ann. Mag. Nat. Hist. [2], vol. xx, pp. 324, 327. 



1858. ,, Billings (pars), Canad. Organic Rem., vol. iii, p. 76. 



1859. „ Salter (pars), in Murchison, Siluria, 3rd edit., p. 248. 

 1879. „ Zittel, Handb. Palaxmt., vol. i, p. 453. 



1884. „ La Touche (pars), Handb. Geol. Shropshire, p. 34. 



1890. Palasterina, Stiirtz (pars), Palaeontographica, vol. xxvi, p. 246. 



1893. „ Stiirtz (pars), Verhandl. Naturh. Ver. preuss. Rheinl., Jahrg. 50, pp. 43, 60. 



1899. Pal&asterina, Gregory, Geol. Mag. [4], vol. vi, p. 349. 



1899. Lindstromaster, Gregory, loc. cit., [4], vol. vi, pp. 344, 346. 



1900. Hisingeraster, Stiirtz, Verhandl. Naturh. Ver. preuss. Rheinl., Jahrg. 56, pp. 224, 225. 

 1900. Pseudopalasterina, Stiirtz, loc. cit., Jahrg. 56, pp. 219, 224. 



1910. Palasterina, Schondorf, Jahrb. Nassau. Ver. Naturk, vol. Ixiii, p. 220. 



1914. ,, Schuchert, Fossilium Catalogus, Animalia, pt. 3, pp. 5, 7, 29, 30. 



1914. Lindstromaster, Schuchert, loc. cit., pt. 3, pp. 5, 7, 21, 23. 



1914. Pseudopalasterina, Schuchert, loc. cit., pt. 3, pp. 5, 7, S6. 



1915. Palasterina, Schuchert, Bull. 88, U.S. Nat. Mus., pp. 49, 130, 138. 140, 150, 154, 156, 196. 

 1915. Lindstromaster, Schuchert, loc. cit., pp. 138, 140, 148, 154, 156. 



1915. Pseudopalasterina, Schuchert, loc. cit., pp. 138, 156. 



1915. Lindstromaster, Bather, Geol. Mag. [6], vol. ii, p. 318. 



Generic diameters. — Groove with an open ambulacra] channel. Bases of arms 

 separated by strongly calcified disc area. Mouth-angle plates swollen with 

 rounded sides. Odontophor in adult either absent or recognisable with 

 difficulty. Adambulacralia bound the oral surface of the arm, and frequently have 

 a ridge bearing stout spines (see p. 205). 



The name Palasterina was suggested by McCoy, who in 1851 (when writing 

 about the three species named by Forbes Uraster ruthveni, U. Jiirudo and 

 U. primsevus) stated : " Before I was aware Professor Forbes had described 

 them, it seemed to me that the U. ruthveni and U. hirudo, as well as the similar 

 American species Urasterella pulchella, might be easily separated from the great 

 starfishes forming the recent genus Uraster by their small size and much more 

 simple skeletons, and I had named the genus Urasterella in my manuscript. The 

 U. primsevus I thought geuerically distinct from the other two, as the rays were 

 not coutracted at base, etc. ; and I had named it Palasterina, from its resemblance 

 to the recent genus Asterina." McCoy then went on to publish the descriptions 

 given by Forbes. 



Salter in 1857 definitely accepted McCoy's name with the same genotype, 

 P. primseva. He defines the genus as follows : " Pentagonal, depressed, the arms 



