a. 
PENTAGONASTER. 13 
PENTAGONASTERID/ (see p. 21). 
PENTAGONASTERIN-E (see p. 21). 
Key to the Genera of Pentagonasterine.. 
UG Y TORN VONEE Ss aki 4s vs oc\s Se ecowee ¢ 1, PENTAGONASTER, p. 78. 
Body with elongated arms............ 2. NyMPHASTER, p. 79. 
Incert@ sedis. 
Marginals indistinct ............... . 3. HippastTeRtias, p. 76. 
1. PENTAGONASTER. 
Pentagonaster, C. F. Schultze, Betr. verst. Seesterne, (1760) p. 50; Perr. 
Arch. Zool. exp. v. (1876) p.6; Sladen, Chall. Rep. Ast. (1889) p. 264. 
Goniaster (pars), Ag. Mém. Soc. Neuch. i. (1836) p. 191; M. Tr. 
Arch. f. Nat. vi. (1840) p. 322. 
Astrogonium, M. Tr. (pars) Syst. Ast. (1842), p. 52; Sladen, Chall. 
Rep. Ast. (1889) p. 265. 
Body flat, pentagonal, sides nearly straight; marginals not 
numerous, usually covered with granules; dorsal intermediate 
plates hexagonal or irregular in form, covered with flat granules and 
extending to the ends of the rays; no valve-like pedicellarie. 
Key to the Species. 
LOST CEE) te ie ae earn 1. P. granularis. 
Ep OPE MEDD 2 Frases, wae vince arate vets» « 2. P. greeni. 
1. Pentagonaster granularis. (Plate X. figs. 4, 5, & 6.) 
Asterias granularis, Retzius, Vet.-Akad. Hdlg. iv. (1783) p. 238; 
Abilg. in Zool. Dan. iii. (1788) p. 19, pl. xcii.; Retz, Diss. Spec. 
Ast. (1805) p. 10. 
Asterias tessellata, var. A, Lamk, An. s, Vert. ii. (1816) p. 552; 
ad. op. cit. 2nd ed. (1840) iii. p. 238. 
Astrogonium granulare, M. Tr. Syst. Ast. (1842) p. 57; Sars, 
Norg. Ech. (1861) p. 46. 
Astrogonium boreale, Barrett, Ann. § Mag. xx. (1857) p. 47, pl. iv. 
fig. 5. 
Gon ister eranularis, Liith. Vid. Medd. 1864 (1865), p. 146. 
Pentagonaster granularis, Kor. § Dan. Norske Norhavs Ast. (1884) 
p- 58; Sladen, Chall. Rep. Ast. (1889) p. 268. 
Pentagonaster balteatus, Sladen, Proc. R. Irish Acad. i. (1891) 
p. 688, pl. xxv. 
Pentagonaster coneinnus, zd. t. c. p. 690, pl. xxvi. 
R=1'3r to 1°47. 
Small, sides slightly curved. About seven supero- and infero- 
marginals on either side of each arm with a single terminal plate. 
Ambulacra very narrow, bordered by two rows of spines, of which 
there are two or three on each plate; those of the inner row are 
