PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 303 



In the oldest stage studied by Mortensen the radials have grown considerably and 

 nearly join each other, separating the orals from the basals. The IBr, and IBrj have 

 lengthened and now have the appearance of a small arm. The radianal apparently 

 has not grown, and has now been pushed out from its original position in the mid- 

 radial line so as to lie wholly in its own interradius between the basal and oral, while 

 the radial has occupied its final position in the mid-radial line, though it is not yet 

 quite symmetrical, the side adjoining the radianal being somewhat narrower. Some 

 meshwork has developed in the depression in the orals. The column in this specimen 

 is incomplete; but in another only slightly younger there are 23 columnals. The 

 tenninal stem plate remains small and without lobes. 



So far as can be ascertained without sectioning, the outer pore of tlie pore canal 

 is closed in this stage. The primary gonad is very small and indistinct. 



Localities. — Albatross station 5688; off Lower California; west tangent, Natividad 

 Island, bearing N. 15° E., and Breaker Point bearing N. 72° E. Qat. 27°38'45" N., 

 long. 115°17'40" W.); 960 meters; temperature 4.39° C; density 1.02482; green mud 

 and globigermae; April 23, 1911 (1, U.S.N.M., E. 1104). 



Albatross station 2987 ; northwest of Cedros Island, Lower California Qat. 28°54'15" 

 N., long. 118°18'00" W.); 312 meters; temperature 7.95° C; gray sand with black 

 specks and gravel; February 28, 1889 (1, U.S.N.M., 35800). 



Templeton Crocker Expedition, station 175: D-1; west of San Jose Point, Lower 

 California; 82 meters; bottom, shaley [Ziesenhenne, 1937]. 



Albatross station 4383; off San Diego, California; north point of North Coronado 

 Island bearing S. 79° E., 2.3 miles distant; 525-722 meters; temperature 5.28° C; 

 March 18, 1904 (1, U.S.N.M., 35846). 



Albatross station 4341; off San Diego; south point of South Coronado Island 

 bearing N. 79° E., 3.3 miles distant; 216-590 meters; temperature 7.78°-5.56° C; 

 gray sand and black specks; March 11, 1904 (1, U.S.N. M., 35845). 



Albatross station 2936; off San Diego (lat. 32°49'00" N., long. 117°27'30" W.); 

 656 meters; temperature 9.44° C; mud; February 4, 1889 (2, U.S.N.M., 35841). 



Albatross station 5695; ofif San Diego (lat. 33°33'00" N., long. 120°17'30" W.); 

 976 meters; temperatxrre 3.83° C. ; density 1.02466; green sand and globigerinae ; April 

 26, 1911 (4, U.S.N.M., E. 1103). 



Albatross station 4384; near San Diego; Point Loma Light House bearing N. 68° 

 E., 7.7 mUes distant; 254 meters; gray sand and rock; March 21, 1904 (7, U.S.N.M., 

 35839). 



Dr. Th. Mortensen's Pacific Expedition, 1914-16; La Jolla, California; 110 meters 

 (1, CM.). 



Albatross station 4372; near San Diego; Point Loma Light House bearing N. 82°30' 

 E., 9.8 miles distant; 159-186 meters; gray sand and rock; March 16, 1904 (1, U.S.N.M., 

 35843). 



Albatross station 4361; near San Diego; Point Loma Light House bearing 

 N. 87° E., 9.9 miles distant; 166-177 meters; gray sand with black specks, mud, 

 and rock; March 15, 1904 (2, U.S.N.M., 35848). 



Albatross station 4375; near San Diego; Point Loma Light House bearing N. 81° 

 E., 10.1 miles distant; 157-161 meters; coarse sand, shells and rock; March 17, 1904 

 (6, U.S.N.M., 35842). 



