1918 Bush: on Echinoderms 39 



KEY TO SPECIES 



A. Salmon colored to dark purplish red ; animal up to 20 cm. long ; tube- 

 feet on each radius irregularly distributed in 1 band. 1. C. japonica 

 AA. White, yellowish, or white with brown dots; not over 15 cm. long. 

 B. Tube-feet on each radius in 2 single rows with scattered ones be- 

 tween ; animal up to 15 cm. long ; usually along tide line. 



2. C. chronhjelmi 



BB. Tube-feet on each radius in 2 definite rows; animal up to 10 cm. 



long; in deep water. 3. C. lubrica 



BBB. Tube-feet on each radius irregularly distributed in 2 narrow 



bands; animal up to 5 cm. long; in deep water. 



^. C. pulcherrima 



1. Cucumaria japonica Serfiper. 



Larger than C. chronhjelmi, sometimes 20 cm. long; tube-feet large, 

 arranged in series along the radii, not in rows; tentacles 10, equal in size, 

 much branched, rather long; calcareous deposits not numerous, rod-like in 

 tentacles, irregular perforated plates in body wall ; calcareous ring delicate 

 for size of animal ; radial pieces somewhat wider than the interradial, with 

 deep notches in posterior margin (Fig. 44). Color red-salmon to dark 

 brownish-purple. — Numerous, along shore, sometimes in deep water. 



2. Cucumaria chronhjelmi Theil. 



Medium in size, sometimes 15 cm. long; tube- feet very long, confined 

 to radii, arranged in 2 rows with others scattered irregularly ; tentacles 

 10, short, much branched, tuft-like, yellow; calcareous deposits many, 

 various in form, rod-like in tentacles, plates-like in tube feet, basket- or 

 cup-like in body wall ; calcareous ring large, well developed ; radial pieces 

 with rather short pointed posterior prolongations (Figs. 46-50). Color 

 white or yellowish. — Numerous along tide line, often found in deep water. 



li. Cucumaria lubrica Clark. 



Medium in size, 5 to 10 cm. long; cylindrical, blunt at both ends; 

 surfaces smooth ; tube feet short, confined to 2 simple rows on each radius ; 

 tentacles 10, short, branched, unequal, 4 dorsal ones longest. Calcareous 

 deposits in the tube feet few, like curved rods; in the body wall numerous, 

 resembling thick knobbed plates or buttons ; in the tentacles a few large 

 supporting rods; calcareous ring small, both radial and interradial pieces 

 with short anterior prolongations, radial pieces notched posteriorly. Res- 

 piratory tree with short branches enlarged at the tips, differing from the 

 long finger-like branches of other Cucumaria rts))iratory trees (Figs. 51- 

 55). Color white with brown (h)ts, dots sointtimes almost covering the 

 surface. — Rather nuuitroiis. in about 35 fatlionis iu;ir Olga. 



