PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 703 



Differential characters. So far as I am able to see the only reliable character sep- 

 arating this form from H. sarsi is the difference is the cirri. 



P. H. Carpenter noted that in tenetta the distal ends of the segments in the elon- 

 gated oral pinnules are fringed with strong spines so that they appear to overlap the 

 bases of their successors, this feature being much less developed in European specimens 

 of sarsi, while on the other hand the delicate calcareous rods at the sides of the ambu- 

 lacra which Sars described in the larva are larger in specimens from Norway than in 

 examples from deep water, and are sometimes entirely absent in tendla. 



According to Carpenter, tenella is also remarkable for the want of constancy in 

 the proportions of the second pair of pinnules. In some examples he found that these 

 have only a dozen segments and are not more than 5 mm. long, or only a third the length 

 of the first pah 1 ; but in others they reach 7 or 8 mm. and have as many as 20 segments, 

 a condition he did not notice in any specimens of sarsi from the eastern Atlantic. 



Localities. Albatross station 2264; between Cape Hatteras and Nantucket (lat. 

 3707'50" N., long. 7434'20" W.); 305 meters; temperature 8.22 C.; gray sand; 

 October 18, 1884 (3, U.S.N.M., 8350, 8537). 



Fish Hawk station 898; off Chesapeake Bay (lat. 3724'00" N., long. 7417'00" 

 W.); 549 meters; temperature 6.67 C.; mud; November 16, 18SO (2, U.S.N.M., 9644). 



Fish Hawk station 897; off Chesapeake Bay (lat. 3725'00" N., long. 7418'00" 

 W.); 288 meters; temperature 8.89 C.; sand and mud; November 16, 1880 [Verrill, 

 1882, 1884] (32. U.S.N.M., 9643, 35868). 



Albatross station 2022; off Cape May (lat. 3732'00" N., long. 7413'20" W.); 

 891 meters; temperature 4.44 C.; blue mud; May 21, 1883 (8, U.S.N.M., 6387). 



Fish Hawk station 1048; off Delaware Bay (lat. 3829' N., long. 7321' W.); 796 

 meters; temperature 4.44 C.; mud; October 10, 1881 [Verrill, 1884] (1, U.S.N.M., 

 35861). 



Fish Hawk station 1047; off Delaware Bay (lat. 3831' N., long. 7321' W.); 285 

 meters; temperature 9.44 C.; sand; October 10, 1881 [Verrill, 1882, 1884] (65, U.S.N.M., 

 4123, 24091, 35858). 



Albatross station 2232; off Cape Hatteras (lat. 3837'30" N., long. 7311'00" 

 W.); 444 meters; temperature 6. 00 C.; green mud; September 12, 1884 (1, and 1 pentac- 

 rinoid, U.S.N.M., 24104, 24108). 



Fish Hawk station 1043; off the Capes of Delaware (lat. 3839' N., long. 7311' 

 W.); 238 meters; temperature 9.44 C.; soft mud; October 10, 1881 [Verrill, 1882, 1884] 

 (1, U.S.N.M., 35822). 



Albatross station 2590; between Cape May and Cape Sable (lat. 3853'30" N., 

 long. 7252'00" W.); 348 meters; temperature 8.67 C.; green mud and sand; Septem- 

 ber 21, 1885 (1, U.S.N.M., 12310). 



Albatross station 2589; off Cape May, New Jersey (lat. 3855'00" N., long. 

 7850'30" W.); 422 meters; temperature 6.78 C.; green mud and sand; September 21, 

 1885 (1, U.S.N.M., 12291). 



Off New Jersey [Verrill, 1882; P. H. Carpenter, 1884]. 



Great Egg Harbor, New Jersey [Say, 1825; Verrill, 1866]. 



Albatross station 2175; between Cape Hatteras and Nantucket (lat. 3933'00" 

 N., long. 7218'30" W.); 827 meters; temperature 4.72 C.; green mud; July 22, 1884 

 (5, U.S.N.M., 35875). 



