68 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



Maximum frequency, 64 per cent at station 155; other records 

 above minimum (2 to 44 per cent) from all stations except 

 54; average in net samples, 15.3 per cent; in pump samples 

 there were i to 6 loricae, average 1.7. 



Temperature: pump samples i4?32-27?73 (24?i5), net 

 samples i8?74-28?6o (25?i6). Salinity: pump samples 

 34.50-35.04 (34.77), net samples 34.18-36.49 (34.93). Den- 

 sity: pump samples 22.29-25.75 (23.45), net samples 22.65- 

 25.37 (23-54)- pH: pump samples 7.87-8.47 (8.34), net 

 samples 7.93-8.44 (8.28). 



Epiplocylis deflexa Kofoid and Campbell 



Epiplocylis dcflcxii Kofoid and Campbell, 1929, p. 178, fig. 334; 

 Marshall, 1934, p. 645, fig. 20. 



The moderately large lorica, with convex bowl, conical 

 aboral horn, and strongly deflected free lines, has a length of 

 1.67 oral diameters. The oral margin is thick, but sharp 

 and erect. The wide bowl increases regularly from the rim 

 to 1. 17 oral diameters at 0.5 oral diameter below the rim. 

 The lower bowl is convex conical (20° increasing to 74° 

 and then to 93°), being least in its anterior half and grad- 

 ually wider below. The aboral horn is narrow conical (23°) 

 with a length of 0.28 oral diameter, and is sharply pointed 

 at its free tip. 



The wall is angular in section. Its thickness (maximum 

 0.14 oral diameter) reduces the cavity to 0.89 oral diameter 

 near 0.17 below the rim, and is gradually reduced by thin- 

 ning lower down. There are relatively thick laminae with 

 large, rectangular secondary areas; these last, in turn, enclose 

 minute primary alveoles. The reticulated aboral region 

 occupies the lowermost 0.67 oral diameter. The reticula- 

 tions are large, subcircular, deeply pitted areas. The free 

 lines are strongly deflected to the left (up to 60°) and then 

 extend upward to within the anterior 0.25 of the bowl. On 

 the upper end of the horn there are strong vertical ridges. 

 Length, 88 to 11 3^1. 



The Carnegie material agrees closely with Marshall's. 

 Epiplocylis deflexa resembles E. constrieta, but the free 

 lines are more strongly deflected and longer, the wall is 

 thicker, with secondary areas, and the horn is not so long. 

 Epiplocylis pacifica is longer and more trim, with shorter 

 free lines which are vertical rather than deflected. Epiplocylis 

 inconspicuata has a wider (not flattened) bowl with sub- 

 cylindrical upper section. 



Recorded from eleven stations in the Pacific, as follows: 

 four (45, 46, 47, 80) in the Galapagos region, four (48, 82, 

 85, 95) in the region of South Pacific island fields, two (99, 

 153) in the Pacific equatorial region, and one (113) in the 

 North Pacific middle latitudes. 



There are 2 pump and 12 net samples, of which 3 were 

 taken at the surface, 5 at 50 meters, and 6 at 100 meters. 

 Maximum frequency, 21 per cent at station 47; other records 

 above minimum (2 to 18 per cent) from stations 45, 46, 48, 

 82, 95, 99, 113, 153; average in net samples, 6.6 per cent. 



Temperature: pump samples 23?58-28?05 (25:81), net 

 samples 2i'?69-28?74 (24?45). Salinity: pump samples 

 34.40-36.21 (35.30), net samples 34.66-36.44 (35.49). Den- 



sity: pump samples 21.95-24.70 (23.32), net samples 22.43- 

 24.48 (23.86). pH: pump samples 8.18-8.39 (8.28), net 

 samples 8.12-8.28 (8.19). 



Epiplocylis exigua Kofoid and Campbell 



Epiplocylis exigua Kofoid and Campbell, 1929, p. 178, fig. 337; 

 Marshall, 1934, p. 643, fig. 17. 



The rather small lorica, with subcylindrical upper and 

 conical lower bowl, thickened suboral wall, well reticulated 

 surface, and gradually differentiated aboral horn, has a 

 length of 1.83 oral diameters. The oral margin is thick. 

 The bowl is convex subcylindrical in the anterior 0.65 oral 

 diameter, and conical below (53° in the upper two-thirds 

 and 80° in the lower part). The aboral horn is gradually 

 formed, being conical (16°), with a length of 0.38 oral 

 diameter, and blunt at its free tip. 



The wall has a thickness of o.i oral diameter in the 

 thickened zone, which occupies the anterior 0.41 oral diam- 

 eter; its thickness is reduced to a third as much in the 

 remaining part of the bowl. There are rather thick laminae 

 which enclose hyaline material. The reticulated region 

 occupies about 0.75 of the length of the bowl; the reticula- 

 tions are large, squarish, pitted areas. A few vertical free 

 lines occur, and on the upper end of the horn are upright 

 lines. 



Length, 74 to 88^. 



This species intergrades in some characters with Epi- 

 plocylis labiosa, as Marshall (1934) points out, but it may 

 be distinguished by the fuller lower bowl, the more gradually 

 differentiated horn, and the higher level of the reticulated 

 area. Its horn is not so long as that of E. lata, and the bowl 

 and horn are less distinct; the reticulated region is typically 

 higher in lata. 



Recorded from four stations in the Pacific, as follows: one 

 (78) in the Galapagos region, one (83) in the region of 

 South Pacific island fields, one (113) in the North Pacific 

 middle latitudes, and one ( 136) in the California region. 



There are 3 pump samples and i net sample, of which i 

 was taken at 50 meters and 3 at 100 meters. Frequency, 12 

 per cent at station 113; other records minimum. 



Temperature: pump samples i8?87-27?46 (22?46), net 

 sample 2i?74. Salinity: pump samples 35.02-36.49 (35.56), 

 net sample 34.66. Density: pump samples 23.71-25. 11 

 (24.63), net sample 24.06. pH: pump samples 8.14-8.39 

 (8.25), net sample 8.23. 



Epiplocylis exquisita Kofoid and Campbell 

 Epiplocylis exquisita Kofoid and Campbell, 1929, p. 179, fig. 



342- 

 The moderately tall, wide lorica, with convex subconical 

 bowl, has a length of 1.25 oral diameters. The oral margin 

 is thin and fairly sharp. The bowl is very v\'ide, and convex 

 subconical (18° increasing to 48° and then to 90°), the 

 angle being least in the anterior 0.46 oral diameter and 

 greatest in the aboral 0.3 oral diameter. The aboral horn is 

 narrow conical (18°), and 0.33 oral diameter in length, with 

 a pointed free tip. 



