7 o 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



Epiplocylis inflata is much like E. laac\manni, but its 

 horn is shorter and the lower bowl is fuller. It is much 

 wider and relatively shorter, and has a wider free region 

 than E. calyx. It only remotely resembles E. acuminata, 

 which has a longer bowl and horn and different pro- 

 portions. 



Recorded from station 23 in the Atlantic equatorial region, 

 in a net sample taken at 50 meters. Frequency, 2 per cent. 



Temperature, 20?99; salinity, 36.04; density, 25.30; pH, 

 8.14. 



Epiplocylis labiosa Kofoid and Campbell 



(Figure 74) 



Epiplocylis labiosa Kofoid and Campbell, 1929, p. 182, fig. 338. 



The subconical, rather elongated lorica, with short reticu- 

 lated region and thick suboral area, has a length of 1.87 oral 

 diameters. The oral margin is thin and erect. The acorn- 

 shaped bowl expands (45°) to 1.17 oral diameters at 0.22 

 oral diameter below the rim and then contracts below the 

 thickened zone (0.38 oral diameter in width) as a segment 

 of inverted flat-sided cone (30 ) with a length of 0.43 oral 

 diameter; its diameter at the lower end is 0.81 oral diameter. 

 Below this section the bowl becomes more widely conical 

 (73 ), and the diameter at the truncate lower end is only 

 0.16 oral diameter. The aboral horn is 0.54 oral diameter 

 in length and narrow conical (15°). Its free tip is sharp. 



The wall has a thickness of 0.16 oral diameter in the 

 thickened suboral zone, but elsewhere is reduced to three- 

 tenths as much. There are extremely thin laminae, which 

 enclose many layers of very small alveoles. The reticulated 

 region is deeply pitted and coarse, and covers the lowermost 

 conical section of the bowl; above it is a faint network of 

 large, virtually hexagonal areas which reach to just below 

 the thick suboral region; the vertical lines of the mesh are 

 stronger than the horizontal ones. 



Length, 73 to 85^1. 



The Carnegie loricae are shorter and have a finer mesh 

 than is usual for this species. 



Epiplocylis labiosa is longer and narrower, with a shorter 

 free zone and a thicker suboral band than E. calyx. Epi- 

 plocylis exigua is shorter and wider and has a lower zone of 

 reticulations. Epiplocylis lata has a more cylindrical upper 

 bowl, wider aboral cone, and even coarser reticulum. 



Recorded from thirty stations, ten in the Atlantic and 

 twenty in the Pacific, as follows: four (19, 20, 20-21, 21) in 

 the Sargasso Sea, six (22, 23, 24, 25, 29, 30) in the Atlantic 

 equatorial region, four (82, 85, 87, 93) in the region of 

 South Pacific island fields, ten (100, 101, 102, 103, 104, 105, 

 106, 107, 150, 151) in the North Pacific trade region, four 

 ( 137, 147, 148, 149) in the California region, and two ( 153, 

 154) in the Pacific equatorial region. 



There are 26 pump and 20 net samples, of which 15 were 

 taken at the surface, 17 at 50 meters, and 14 at 100 meters. 

 Maximum frequency, 6 per cent at station 21; other records 

 above minimum (2 to 3 per cent) from stations 19, 22, 137, 

 153, 154; averages, 1.6 and 1.7 per cent in Atlantic and 

 Pacific net samples; none of the pump samples had more 

 than 3 loricae. 



Temperature: Atlantic, pump samples i4?6o-27?56(22?79), 

 net samples i 4 ?6o-27?88 (23?02); Pacific, i8?28-25?8i 

 (22?^) and 23?i5~28?74 (25?95), respectively. Salinity: 

 Atlantic, pump samples 35.70-36.21 (35.80), net samples 

 35-7°-37- I 5 (36-29); Pacific, 34.39-36.32 (35-16) and 34.42- 

 35.12 (34.81), respectively. Density: Atlantic, pump samples 

 23.36-26.62 (24.65), net samples 23.26-26.62 (24.73); Pacific, 

 21.95-24.26 (23.26) and 22.98-24.77 (24.03), respectively. 

 pH: Atlantic, pump samples 7.93-8.31 (8.17), net samples 

 7.93-8.37 (8.21); Pacific, 8.21-8.34 ( 8 - z6 ) and 7-93~ 8 -3 8 

 (8.23), respectively. 



Epiplocylis lata Kofoid and Campbell 

 (Figure 78) 

 Epiplocylis lata Kofoid and Campbell, 1929, p. 182, fig. 336. 



The short lorica, with greatly thickened suboral band and 

 abruptly contracted aboral end, has a length of 2.2 oral 

 diameters. The oral rim is the rounded edge of the thick- 

 ened suboral region. The bowl expands rapidly (55°) for 

 0.24 oral diameter to 1.07 oral diameters. Below this level it 

 tapers (14 ) for 1.0 oral diameter, the diameter at the lower 

 end being 0.92 oral diameter. The aboral region is convex 

 conical (8o°) for about 0.5 oral diameter. At its lower end 

 is the sharply pointed, conical (16°) aboral horn, the length 

 of which is 0.6 oral diameter. 



The wall thickens to 0.16 oral diameter in the suboral 

 region (the width of the band reaches 0.52 oral diameter), 

 and is elsewhere less than three-tenths as much. The reticu- 

 lated area extends to a little below the thickened zone and 

 is made up of large rectangular to pentagonal areas; some 

 are even subcircular, and all are deeply pitted. The horn 

 has long vertical ridges on its upper part. 



Length, 82 to nop:. 



A few of the Carnegie loricae are longer than is usual for 

 this species. 



Epiplocylis lata is more abruptly rounded aborally and its 

 aboral horn, which is distinctly spinelike, is set off more 

 suddenly from the lower bowl than in E. calyx, E. exigua, or 

 E. labiosa. In the Carnegie collection it is not easily distin- 

 guished from labiosa. 



Recorded from fourteen stations in the Pacific, as follows: 

 six (45, 46, 47, 75, 78, 80) in the Galapagos region, four 

 (48, 82, 84, 85) in the region of South Pacific island fields, 

 and four (54, 61, 64, 65) in the South Pacific middle lati- 

 tudes. 



There are 7 pump and 16 net samples, of which 7 were 

 taken at the surface, 11 at 50 meters, and 5 at 100 meters. 

 Maximum frequency, 44 per cent at station 45; other records 

 above minimum (2 to 5 per cent) from stations 46, 47, 48, 

 54, 82, 84, 85; average in net samples, 7.9 per cent; in pump 

 samples there were 1 to 33 loricae, average 10.8. 



Temperature: pump samples i4?03-23?30 (20?82), net 

 samples io?92-27?89 (22?23). Salinity: pump samples 

 33-9 6 -35-9 6 (3v°9)- net samples 34.05-36.44 (35.55)- Den- 

 sity: pump samples 24.11-25.40 (24.52), net samples 23.38- 

 26.06 (25.23). pH: pump samples 8.05-8.16 (8.13), net 

 samples 8.03-8.23 (8.15). 



