ERYLUS DECU]\IBENS. 317 



Erylus placenta Thiele. 

 Zoologica, 1S9S, 24, p. 5, plate 1, fig. 1; plate 6, fig. 1 a-h. Le.vdenfeld, Tierreioli, 1903.19, p. S7. 



Incrusting, 2-3 mm. thick. In spirit : reddish gray. 



Amphioxes: mostly 700-800 by about 15 /t; sometimes much shorter, 

 only half as long. Orthotriaenes : rhabdome 500, clades 270 /t long. 



Microrhabds: slightly curved, abruptly pointed centrotyle amphioxes; 

 25-50 /I long. Oxyasters: three to six, most frequently four rays; each ray 20- 

 30 n long. Oxysphaerasters: centrum about 5, whole aster 10 pL in diameter. 

 Aspidasters: oval, very frequently with incised margin, irregular; 170-200 by 

 80-90 by 18 fi. 



Northwestern Pacific. Japan: Kagoshima Bay. 



Erylus monticularis KiRKP.vxnrcK. 

 Ann. mag. nat. hist., 1900, ser. 7, 6, p. 351, plate 14, fig. 3 a-h. 



Thin, incrusting. Pale brown. 



Amphioxes: 210 by 10 /«. Orthotriaenes, rhabdome Q /x thick; clades 186 /t 

 long. 



Microrhabds: amphiox; 40-80 by 1-3 /i. Oxyasters: about 6 rays; total 

 diameter 18 30 /i. Small tylasters (chiasters, Kirkpatrick) : with small centrum; 

 about 12 rays; total cUameter 10 ,«. Aspidasters: 150 /x long, 114 /t broad. 



Central Pacific. Funafuti Islet. 



Erylus decumbens Lindgren. 



Zool. anz. 1S97, 20, p. 48.5. Zool. jalirb. Syst., 189S, 11, p. 338, plate 20, fig. 1. 

 Erylus euaslriim (Schmidt) Lendenfeld, Tierreich, 1903, 19, p. 86. 



Incrusting, 3 mm. high. Surface black, interior gray. 



Amphioxes: one end often blunt, 0.8 mm. by 24 /x. Orthophujiotriaenes: 

 rhabdome 420 by 28 //; clades curved, concave to rhabdome, 280 /tlong; clade- 

 angles nearly 90° (according to text), 104° (according to figure). 



Mia-orhabds: curved, centrotyle amphistrongyles, 60 by 6 /i. Oxyasters: 

 two to five smooth rays; each ray 24 /< long. Sphaerasters : numerous rays; 

 total diameter 10 fi. Aspidasters: oval, some with incisions; 182 by 120 by 28 //. 



Formerly I was inclined (loc. cit.) to consider this species as identical with 

 Stelletta euastrum Schmidt (1868) and Erylus cylindrigenis Ridley (1884), but the 

 reexamination has made me doubtful on this point, so that I now revert to 

 Lindgren's name. 



Western Pacific: Java. 



