338 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



[VOL. 50 



of Southeast Cape, Copper Island, Commander Group; depth 1567 

 fathoms, with a bottom of gray volcanic sand and green mud. The 

 bottom temperature was not recorded. 



Basals united into a smooth ring, slightly 

 wider above than below, the superior diame- 

 ter of which is equal to about twice the 

 height; radial cup funnel-shaped, about 

 once and a half as broad at its upper end 

 as high, the dorsal surface of the radials 

 rounded, but low, so that the dorsal as- 

 pect of the cup is almost circular; first 

 costals long, trapezoidal, longer than the 

 radials ; axillaries pentagonal, slightly wider 

 than high, the anterior angle much more 

 produced than in B. carpentcrii; both the 

 costals are low and rounded, and there is 

 no indication of a median keel. 



First brachials wedge-shaped, wider (usu- 

 ally much wider) than long; second bra- 

 chials slightly longer and more oblong ; fol- 

 lowing brachials approximately square, 

 gradually becoming elongated toward the 

 tips of the arms ; the brachials up to the 

 sixteenth or seventeenth are deep, and are 

 strongly flattened laterally, exhibiting that 

 character called "wall-sidedness" by Dr. 

 Carpenter to a very marked degree. The 

 first two brachials, the fourth and fifth, and 

 the seventh and eighth are closely united by 

 tri fascial articulation, after which the ninth 

 and twelfth are the only single brachials, 

 all the others being united in pairs by the 

 alternation of bi- and trifascial articulations ; 

 in other words, the third, sixth, ninth, and 

 twelfth brachials are single segments, all 

 the others being united in pairs. 



The first pinnule is usually on the twelfth 

 brachial, but may occur as early as the 

 tenth. 



The stem appears to contain about one 

 hundred segments, of which the first twelve 

 or fifteen are wider than high, most of them 



Fig. 123. — Bathycrinus 

 complanatus, sp. nov. 



