158 BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



Remarl-s.—OdontaMcr crassu^ is the North Pacific representative of 0. grayi 

 (Bell) to wliich it is very closely related, and with which it may ultimately have to 

 be united, if the differences which are believed to exist are not constant. 0. grayi 

 is found in the region of the Strait of Magellan and Falkland Islands. 



In grayi the paxillar spinelets number about the same as in crassus, but the 

 spinelets are shorter than or subecpial to tabulum, wliile in crassns they are slightly 

 longer. In a specimen of grayi which I examined at the Museum of Comparative 

 Zoology, in Cambridge, the primary basal plate is only a trifle larger than the others; 

 in crassus it is much larger. This difference may be due entirely to age. In grayi 

 there are two furrow spinelets and four or five, rarely six, actinal adambulacral 

 spinelets, in about two rows; in crassus there are six or seven spinelets in three rows 

 (or without order). In grayi the recurved tooth is shghtly shorter, and thicker on 

 the outer part (less attenuate distally), and the suboral spinelets are only two or 

 tliree to each plate; in crassus the tooth is distally attenuate and quite sharp, and 

 there are live to eight suboral spines to each plate. In grayi the innermost mar- 

 ginal mouth sjnnelets are larger than the middle ones; in crassus the marginal spine- 

 lets diminish markedly in length from the middle, so that the innermost spinelets are 

 much smaller than the middle ones, and relative to the length of the tooth much 

 smaller than the inner spinelets of grayi, which are at least half as long as the tooth 

 (those of crassus being about one-fourth as long as tooth). 



In this report Vcrrill's groups Acodontaster, Gnathaster (Sladen, restricted), and 

 Odontaster are united to form a single genus, which takes the oldest name, Odontaster. 



Family G0NL4STERrD.E Forbes, 1841 (part). 



Goniasteridse Forbes, A History of British Starfishes, etc., 1841, p. 77 (Asterina, Palmipes, 

 Goniaster). — Verrill, Trans. Conn. Acad., vol. 1, 1867, p. 343. — Perkier, Revision des Stel- 

 K^rides, 1875, p. 185 (includes also Orcasteridse, A.^teropidae, Porania). — Viguier, Squelette 

 des Stell^rides, 1879, p. 166 (includes also Linckiidse [part], Oreasteridae, Asteropidse). — 

 Verrill, 1899, p. 145.— Fisher, 1906, p. 1045. 



Penlagonasteridx Perrier, M^m. sur les l&toiles de Mer, etc., 1884, p. 231. — Sladen, Challenger 

 Asteroidea, 1889, p. 260.— Perrier, 1894, p. 336.— Ludwig, 1897, p. 157; 1905, p. 106. 



Pentacerotidx Gray (part), Ann. and Mag. Nat. Hist., vol. 6, Dec, 1840, p. 275 (included 

 Oreasteridas, Goniasterid;e, Linckiidse, Echinasteridse, Uniophora, Aslerope, Nepanthia). 



Antheneidx Perrier, 1884, and authors. 



Phanerozonia with thick and massive marginal plates, large disk, usually con- 

 spicuous primary ajncal plates, and tessellate abactinal and actinal intermediate 

 plates; abactinal plates polygonal, circular, or stellate, sometimes united bj- internal 

 radiating ossicles, or forming a close mesh -w-ith numerous secondar}' intermediate 

 plates; the plates may bear a central tabulum, paxilliform in structure, or may be 

 simply flat, naked, or covered with granules, or bear an enlarged spine. Papulae 

 usually confined to radial areas. The plates may be obscured by a tough skin, of 

 var\-ing thickness, which is superficially smooth, or covered with granules, or 

 granules and pedicellarise. Tube feet ^vith large sucking disks. Superambulacral 

 ossicles present, rudimentary, or absent. Pedicellariie foraminate, excavate, or 

 bivalved. 



