PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 321 



pinnules. P 4 is 24 mm. long, P 5 is 23 mm. long, and P 6 is 20 mm. long, or the same length 

 as P,. The following pinnules decrease gradually in length to about the twelfth, then 

 increase again. P 4 and the following pinnules bear gonads. 



In the type specimen of inexpectata, from Albatross station 2853, in the Gulf of 

 Alaska in 291 meters, the cirri reach 70 mm. and the arms 230 mm. in length. The 

 proportions of the lower pinnules are very different from those of the proximal pinnules 

 of the type specimen of asperrima. PI and P 2 are about equal in length, proportions, 

 and number of component segments, but P 3 is shorter, frequently very much so, and P 4 

 is shorter still. The minimum is reached on the seventh or eighth pinnule beyond which 

 the length gradually increases. 



In the type specimen of rathbuni, from Albatross station 5033, in Yezo strait in 

 974 meters, which is considerably more robust than that of asperrima though only 

 slightly more robust than the specimen described from Albatross station 3330, PI, P 2 

 and P 3 are of equal length and P 4 is somewhat and P 6 much shorter. 



In the abundant material at hand all possible intermediates between these types 

 of pinnulation are found, while among very small specimens PI may be longer than those 

 following. 



The ossicles of the division series and arm bases never show the extreme develop- 

 ment of spines frequent in F. serratissima, but the least spinous individuals of that 

 species are less spiny than the extreme specimens of asperrima. 



From Monterey, California, northward to the Gulf of Alaska asperrima is more 

 variable than farther northward and westward, and apparently intergrades with F. 

 serratissima. 



Localities. Albatross station 4538; Monterey Bay, California; Point Pinos Light 

 House bearins; S. 85 E., 6.5 miles distant; 1453-1592 meters; hard gray sand; May 31, 

 1904 (3, U.S.N.M., 35822). 



Albatross station 4530; Monterey Bay; Point Pinos Light House bearing S. 78 

 E., 6.8 miles distant; 1380-1751 meters; soft gray mud; May 27, 1904 (23, U.S.N.M., 

 35847). 



Albatross station 4537; Monterey Bay; Point Pinos Light House bearing S. 74 

 E., 7.4 miles distant; 1574-1941 meters; temperature 3.61 C.; hard sand and mud; 

 May 31, 1904 (129, U.S.N.M., 35853). 



Albatross station 4546; Monterey Bay; Point Pinos Light House bearing S. 46 

 E., 8.4 miles distant; 1552 meters; fine black sand and rock; June 3, 1904 (10, U.S.N.M., 

 35825). 



Skidegate Channel, between Graham and Moresby Islands, Queen Charlotte group; 

 73 meters; 1895 (1, Victoria Memorial Museum). 



Albatross station 4302; off Shakan, Sumner Strait, southeastern Alaska; Point 

 Amelius bearing S. 80 W., 5.8 miles distant; 309-387 meters; temperature 6.78 C.; 

 blue mud; August 24, 1903 (1, U.S.N.M., 35821). 



Albatross station 2858; southwest of the Kenai peninsula, Alaska (lat. 5817'00" 

 N., long. 14836'00" W.); 420 meters; temperature 4.33 C.; blue mud and gravel; 

 August 24, 1888 (94, U.S.N.M., 35736, 35820, 35903, 35904% 



Albatross station 2853; south of the Trinity Islands, Alaska (lat. 5600'00" N., 

 long. 15420'00" W.); 291 meters; temperature 5.00 C.; gray sand; August 9, 1888 

 [A. H. Clark, 1907, 1915] (225, U.S.X.M., 21703, 35729, 35738, 35906, 35947, 36183, 

 36252, E. 1094). 



