A. H. CLARK: THE CRINOIDS OP THE IMDIAX OCEAN. 277 



Habitat. — Straits of Macassar. 

 Depth. — 1301 meters. 



BATHYCRINUS PARADOXUS. 



Bathijcrinus jjarado.vKs 1909. A. H. CIlark. Proc. Biol. Soc. Washington, vol. 22, 

 p. 151. 



Description. — Stem very slender ; longest columnars of smaller stem 2'5 mm. 

 in length, of larger stem 3 mm.; columnars of middle of larger stem 07 ram. 

 broad at the ends, 04 mm. broad in the middle. 



Basals five, not anchylosed, forming a basal ring which expands shghtly 

 anteriorly and is about as long as the breadtli at the top of the stem ; radials 

 forming a ring expanding rather rapidly outward from the basals, the sides evenly 

 concave, two and one half times as broad distally as proximally, half again as 

 broad distally as long ; IBr, trapezoidal, nearly twice as long as broad proximally ; 

 IBr^ trapezoidal, nearly twice as broad as long. 



Arms ten, all broken off near the base, smooth, apparently similar to those 

 of other species of the genus ; IBr series and lower brachials with a broad thin 

 produced border: distal two-thirds of the IBr,, and the following segments, with 

 a sharp median keel. 



Locality. — Bay of Bengal ; 1300 fathoms. 



Remarks. — The material examined consisted of two broken specimens ; one 

 stem, apparently lacking merely the topmost discoidal columnars, 67 mm. in 

 length (thirty-eight columnars), broken into five part^; part of a larger stem, 

 including the root and twenty-one columnars, and a crown without the distal 

 portion of the arms probably belonging to the latter. 



This interesting species is neai'est to Bathycrinus recHperatus ^ originally des- 

 cribed by Professor E. Perrier, and more recently redescribed and figured by 

 Professor Koehler and M. Vaney.' Perrier's species was so different from the 

 other species of the genus known at that time that he was inclined to regard it as 

 a possible monstrosity. Later, for some reason not quite clear, he referred it to 

 Hyocrinus. Tliis species lias never received the attention it deserves, possibly as 

 a result of P. H. Carpenter's somewhat severe criticism of Perrier's work, and 

 especially of his misconcejjtion of the genus Bathycrinus, which he confused with 

 the so-called Ilycrinus ("Hyocrinus")^ and of Rhizocrinus, which he renamed 

 Democrinus. 



Bathycrinus paradoxus agrees with B. recuperatus in possessing separate 

 basals; but in B. recuperatus the IBr, and ^ have a perfectly smooth dorsal 

 surface, and the columnars are not quite twice as long as broad. The basals also 

 are very nearly as long as the radials. 



In 1896 Dr. Camillo Crema of Turin published a description of a minute 

 crinoid from the lower Muschelkalk near Rovegliana, east of Recoaro, in the 



Bull, du Mus. d'hist. nat., 1910, No. 1, p. 28. 



