ASTEROIDEA 109 



Forma penicillattis and a problematical intergrade were taken as deep as 242 m. There is 

 probably no effective difference in the bathymetrical distribution of the two forms. 



Koehler (1920, pp. 191, 195) has based a new genus Epidontaster upon E. pentagonalis 

 {he. cit. p. 235, pi. 39, figs. 3, 4, 8; pi. 41, figs. 9-1 1) a new species, which is probably 

 a variant of Odontaster meridionalis characterized by having 3 hyaline teeth to each 

 mouth angle. The presence of a smaller hyaline tooth on either side of the median tooth 

 is a normal variation in Odontaster. The innermost suboral spine on either side of the 

 median tooth varies considerably in size. When it reaches a certain length it tends to 

 bend away from the mouth angle and in extreme cases to acquire a blunt or pointed 

 hyaline tip. I have noted 3 hyaline teeth in 8 specimens of forma ^roy?, ranging in size 

 from R 14 mm. to R 42 mm., from Sts. WS 83, 84, 86, 246, 824, 825. Numerous others 

 have the lateral inner suboral spine simply enlarged. In iorma penicillatus 5 specimens from 

 Sts. WS 73, 85, 756A have such enlarged laterals, which can scarcely be called hyaline. 



Odotitaster crassiis Fisher (1911, p. 54, pi. 29, figs. 1-4; pi. 56, fig. 6), coast of Cali- 

 fornia, 43-284 fathoms, resembles a stellate forma ^rajv'. The marginal plates are fewer 

 and much more massive than in the heaviest margined specimens of grayi. In crassus 

 the superomarginals are 7 or 8, while in a comparable specimen oi grayi they are 10-12. 

 In crassus the primary interradial plates are conspicuously larger than the other abactinal 

 plates which is not the case in grayi. In crassus the actinal spines are much coarser than 

 in any of the numerous examples of grayi. 



Genus Acodontaster Verrill 



Gnathaster pars, Sladen, 1889, p. 285. 



Acodontaster Verrill, 1899, p. 204. Type Gnathaster elongatus Sladen. 



Heuresaster Bell, 1908, p. 8. Type H. hodgsoni Bell. 



Pseudontaster Koehler, 1912, p. 85. Type Ps. marginatus Koehler. 



Metadontaster Koehler, 1920, pp. 191, 193. Type M. waitei Koehler. 



Tridontaster Koehler, 1920, pp. 191, 193. Type T. laseroni Koehler. 



Odontaster pars, authors. 



Acodontaster elongatus (Sladen) 



Gnathaster elongatus Sladen, 1889, p. 288, pi. 19, figs. 5, 6; pi. 48, figs. 1-4; pi. 49, figs. 5-10. 

 Acondontaster elongatus Verrill, 1899, p. 204. 



Odontaster cremeus Ludwig, 1903, p. 21.— Koehler, 1912, pp. 81, 198, pi. 3, figs, i, 3. 

 Acodontaster cremeus Koehler, 1920, p. 199, pi. 45, figs. 1-4, 7-12; pi. 47, figs, i, 3, 4; pi. 69, 



figs. 3. 4- a c s 



Pseudontaster stellatus Koehler, 1920, p. 210, pi. 50, figs. 1-7; pi. 70, fig. 2 (forma). 

 Pseudontaster moderatus Koehler, 1923, p. 89, pi. 11, figs. 6, 7 (Shag Rocks). 



St. 123. Off mouth of Cumberland Bay, South Georgia, 230-250 m., grey mud, i specimen. 



St. 148. Off Cape Saunders, South Georgia, 132-148 m., grey mud and stones, i specimen. 



St. 149. Mouth of East Cumberland Bay, South Georgia, 220-234 n^-- ™^'^' ' specimen (R 

 104 mm., r 36 mm.). 



St. 170. Off Cape Bowles, Clarence Island, 63° 17' 20" S, 59° 48' 15" W, 200 m., mud, stones, 

 gravel, 3 young specimens. 



St. 181. Schollaert Channel, Palmer Archipelago, 160-330 m., mud and stones, i specimen. 



St. 1564. Marion Island, 46° 36-5' S, 38° 02-3' E, 108-113 m., i specimen. 



6 



DXX 



