40 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



spiral turns bulge somewhat. The aboral horn is short (0.17 

 oral diameter), conical (33°), and twisted. 



The wall is thicker suborally than in the lower bowl and 

 hollow horn; the thickness is 0.05 oral diameter at the maxi- 

 mum, and less than half as much elsewhere. Each of the 

 spiral turns is enclosed by a thin inner and outer lamina, 

 and these, in turn, enclose two to five layers of rounded 

 alveoles. The left-turning spiral turns number 7 to 10. They 

 usually are more or less subuniformly 0.21 oral diameter in 

 width, save for the fourth and fifth ones, which reach 0.26. 

 Optically dark lines separate the turns, and oval lacunae in 

 I or 2 rows occur near the aboral end of the widest turn; 

 sometimes a few odd ones are found on the turn just above 

 this one. Very minute, or primary, alveoles may be found 

 under the highest magnification of the microscope, but in 

 general the wall is pallid. 



Length, 75 to i40[.(. 



Marshall (1934) finds loricae with but a single layer of 

 alveoles, and with aboral swelling. The Carnegie loricae 

 differ among themselves considerably, and a few extremes 

 are figured (figs. 31, 32, 33); figure 29 shows a more com- 

 mon form. One of these specimens (fig. 32) has some like- 

 ness to CoxUella declivis, but differs in important respects. 



Coxliella laciniosa is most like C. declii'ls, but its walls are 

 different, the spiral turns are unlike, and the aboral horn is 

 not blunted. Coxliella decipiens is longer and relatively nar- 

 rower, with more turns and a different horn. The remain- 

 ing species, in spite of the great variability of individual 

 loricae of laciniosa, are quite unlike it and never lead to 

 confusion. 



Recorded from thirty-seven stations, twelve in the Atlantic 

 and twenty-five in the Pacific, as follows: two (15, 16) in the 

 Gulf Stream, four (17, 18, 19, 20) in the Sargasso Sea, five 

 (23, 25, 27, 29, 30) in the Atlantic equatorial region, one 

 (34) in the Caribbean Sea, six (43, 45, 46, 47, 71, 78) in the 

 Galapagos region, six (48, 82, 84, 85, 95, 158) in the region 

 of South Pacific island fields, six (100, 102, 105, 109, 140, 

 150) in the North Pacific trade region, three (136, 146. 148) 

 in the California region, three (141, 144, 145) in the North 

 Pacific middle latitudes, and one (155) in the Pacific equa- 

 torial region. 



There are 19 pump and 24 net samples, of which 4 were 

 taken at the surface, 22 at 50 meters, and 17 at 100 meters. 

 Maximum frequency, lo per cent at station 145; other 

 records above minimum (2 to 4 per cent) from stations 15, 

 27, 34, 48, 84, 85, 145, 148, 155; average in Pacific net 

 samples, 2.4 per cent. 



Temperature: Ariantic, pump samples 2 1 °. 85-27? 1 1 ( 24 ? 20) , 

 net samples i4?6o-25?54 (22?57); Pacific, i5?85-27?52 

 (2i?63) and i8?87-28?74 (24?55), respectively. Salinity: 

 Atlantic, pump samples 36.22-36.60 (36.41), net samples 

 357o-37-'5 (36-42); Pacific, 34.32-36.46 (35.23) and 34.32- 

 36.42 (35.08), respectively. Density: Atlantic, pump samples 

 23.62-25.49 (24.65), net samples 23.98-26.62 (25.10); Pacific, 

 22.71-25.60 (24.00) and 22.31-25.09 (23.63), respectively. 

 pH: Atlantic, pump samples 8.23-8.29 (8.26), net samples 

 7.93-8.30 (8.17); Pacific, 7.83-8.34 (8.19) and 8.13-8.39 

 (8.25), respectively. 



Coxliella longa (Brandt) Laackmann 

 Coxliella longa, Kofoid and Campbell, 1929, p. loi, fig. 196. 



The bullet-shaped lorica, with turns of moderate width, 

 rounded aboral end, and short, curved aboral point, has a 

 length of 2.1 oral diameters. The oral margin is irregularly 

 toothed with larger and smaller scattered denticles. The 

 bowl is subcylindrical in its upper three-fifths and becomes 

 convex conical in the lower part (35° in the anterior region 

 and 105° near the horn). At the aboral end is a slightly 

 curved, projecting point or horn; its free tip is minutely open. 



The wall is only 0.03 oral diameter in thickness across the 

 widest turn. There are relatively thick radial prisms or 

 alveoles in two to four layers between the laminae. At the 

 free tip of the aboral end the wall is somewhat swollen 

 around the opening. Otherwise the cavity conforms to the 

 outer contour. Optically dark lines separate adjacent spiral 

 turns, of which there are 13. These become wider toward 

 the aboral end, the widest one being 0.3 oral diameter, which 

 is three times the width of the narrower anterior ones. Three 

 or four small oval lacunae, v\'ith their long axes directed up- 

 ward, are found on the widest turn. 



Length, 130 to i35!-t. 



Coxliella longa has more turns and a shorter aboral horn 

 than C. declivis, C. laciniosa, and C. pseudanntilata. It also 

 has more turns than C. intermedia (an antarctic species), 

 and an aboral horn. Coxliella luhularis is bigger, with more 

 turns and a relatively better-developed horn. 



Recorded from six stations in the Pacific, as follows: three 

 (47, 69, 78) in the Galapagos region, one (65) in the South 

 Pacific middle latitudes, and two (82, 83) in the region of 

 South Pacific island fields. 



There are i pump and 5 net samples, of which 2 were 

 taken at the surface, 3 at 50 meters, and i at 100 meters. 

 Maximum frequency, 3 per cent at station 69; average, 1.5 

 per cent. 



Temperature: pump sample 24^38, net samples i5?03- 

 27?46 (22?94). Salinity: pump sample 36.03, net samples 

 34.30-36.49 (35.86). Density: pump sample 24.33, '^^' 

 samples 23.67-25.44 (24.18). pH: pump sample 8.14, net 

 samples 8.10-8.24 (^-i?)- 



Coxliella pseudannulata (Jorgenscn) Brandt 

 (Figure 28) 



Coxliella pseudannulata, Kofoid and Campbell, 1929, p. 102, 

 fig- 191- 



The moderately stout lorica, with wide, bulging median 

 spiral turns and thick, blunted aboral end, has a length of 

 2.6 oral diameters. The oral margin is minutely irregular 

 and thin-edged. The bowl is asymmetrically subcylindrical 

 in the anterior 0.45, conical (32°) in the submedian 0.4, and 

 bluntly conical (26°) in the lowermost section. The aboral 

 end is rounded oflf. 



The wall is made up of 9 rather wide, right-wound spiral 

 turns, the width of the median 2 being 0.46 and 0.37 oral 

 diameter. The others are subuniformly about 0.23 or some- 

 what less. The turns commonly bulge in their middles, 



