20 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



Temperature: Atlantic, pump samples 20?99-26? 98 (23?28), 

 net samples i2?i2-28?74 (2i?85); Pacific, i4?77-26?70 

 (2i?58) and i3?37-26?79 (2i'?29), respectively. Salinity: 

 Atlantic, pump samples 36.04-37.00 (36.50), net samples 

 33.36-36.44 (35.22); Pacific, 34.59-36.04 (35.36) and 35.61- 

 37.15 (36.38), respectively. Density: Atlantic, pump samples 

 24.25-25.58 (24.95), net samples 22.43-26.17 (25.47); Pacific, 

 23.42-25.91 (24.02) and 23.79-27.01 (25.43), respectively. 

 pH: Adantic, pump samples 8.14-8.27 (8.22), net samples 

 7.91-8.39 (8.20); Pacific, 8.10-8.39 (8.26) and 7.93-8.27 

 (8.23), respectively. 



Cyttarocylis longa Kofoid and Campbell 



(Figures 41, 43) 



Cyttarocylis longa Kofoid and Campbell, 1929, p. 113, fig. 217. 



The stout, saccular lorica, with rounded to barely pointed 

 aboral end, has a length of 0.76 to 1.08 oral diameters. The 

 oral margin is minutely denticulate and irregular. The 

 collar is a basal segment of an inverted truncated cone (65° 

 to 75°) with a length of 0.12 to 0.15 oral diameter. The 

 nuchal shelf is horizontal, narrow, and concave on the 

 superior face. The bowl is sac-shaped, with its greatest 

 diameter at the throat, 30° suborally and 115° to 130° 

 aborally. The aboral end is evenly rounded to blunt; rarer 

 instances show a trace of aboral pointing. 



The wall is finely reticulated with triangular, pentagonal, 

 or hexagonal polygons. There are 40 to 60 polygons around 

 the throat and 32 to 45 from oral rim to tip. In general, the 

 polygons are graded in size from larger to smaller from the 

 rim downward. There is a double row of large ones with 

 interspersed tiny ones in the collar. The wall has a subuni- 

 form thickness of 0.03 oral diameter in the bowl. The wall 

 of the collar thins out from the internal ledge to the rim. 

 There is a single layer of prisms in the wall, and interpris- 

 matic substance is pronounced between the prisms. 



Length, 103 to 10611. 



There is considerable variation in the shape of the aboral 

 end, which may be evenly rounded, blunt, or rarely pointed, 

 but there is never a nipple. The oral rim is rarely ragged. 

 The Carnegie loricae are 0.76 to 1.08 oral diameters, as 

 against 0.76 to 0.96 recorded by Kofoid and Campbell 

 (1929). 



Cyttarocylis longa differs from C. brandti in being longer, 

 more saccular in bowl, and less evidendy pointed, and in 

 having much finer reticulations. It differs from C. ence- 

 cryphalus in the shape of the aboral end, that of the latter 

 species being flat. The wall of the two species is also dif- 

 ferent. 



Cyttarocylis plagiostoma has a fuller, sharply pointed 

 bowl and a coarse surface, is longer and less stout, and has 

 better separation of collar and bowl than is found in C. ricta. 

 The latter is most likely to be confused with brandti. 



Recorded from thirty-two stations, nine in the Adantic 

 and twenty-three in the Pacific, as follows: one (2) in the 

 Gulf Stream, seven (22, 23, 24, 25, 26, 27, 30) in the Atlantic 

 equatorial region, one (34) in the Caribbean Sea, eight (46, 

 47, 68, 70, 72, 77, 78, 80) in the Galapagos region, three (48, 



159, 160) in the region of South Pacific island fields, three 

 (54, 63, 67) in the South Pacific middle latitudes, two (109, 

 151) in the North Pacific trade region, four (131, 136, 147, 

 148) in the California region, one (145) in the North Pacific 

 middle latitudes, and two (153, 156) in the Pacific equatorial 

 region. 



There are 10 pump and 30 net samples, of which 5 were 

 taken at the surface, 11 at 50 meters, and 24 at 100 meters. 

 Maximum frequency, 29 per cent at station 46; other records 

 above minimum (2 to 27 per cent) from stations 2, 22, 27, 

 47, 48, 54, 67, 70, 78, 109, 131, 136, 145, 147, 151, 153, 156, 

 159, 160; averages, 1.5 and 6.0 per cent in Atlantic pump 

 and net samples, and i.o and 7.9 per cent in Pacific pump 

 and net samples, respectively. 



Temperature: Atlantic, pump samples i8?40-26?o4(i8?72), 

 net samples i4?6o-36?02 (22?33); Pacific, i2?73-24?38 

 (20?52) and i2?i2-28?52 (21^24), respectively. Salinity: 

 Adantic, pump samples 36.08-36.25 (36.16), net samples 

 35.61-36.58 (36.09); Pacific, 34.58-36.04 (35.50) and 33.36- 

 36.04 (35.30), respectively. Density: Atlantic, pump samples 

 23.98-26.01 (24.99), net samples 23.26-26.62 (25.22); Pacific, 

 24.33-26.28 (24.99) and 22.76-26.28 (24.50), respectively. 

 pH: Atlantic, pump samples 8.1 1-8.30 (8.20), net samples 

 7.93-8.30 (8.13); Pacific, 7.68-8.19 (8.09) and 7.68-8.44 

 (8.21). respectively. 



Cyttarocylis magna Brandt 



(Figures 44, 46, 47) 



Cyttarocylis magna, Kofoid and Campbell, 1929, p. 114, fig. 

 222; Hada, 1932Z', p. 564, fig. 16. 



The tall, conical lorica, with low, ill defined collar and 

 short, pedicellated aboral end, has a length of 2.41 to 3.18 

 (2.77) oral diameters. The oral margin is finely to roughly 

 ragged. The short collar is a basal segment of an inverted 

 truncated cone which rarely flares as much as 40°, and has 

 a length of o.io to 0.15 oral diameter. The collar is poorly 

 or scarcely at all delimited from the long bowl. The nuchal 

 shelf is triangular in section, horizontal, and feebly devel- 

 oped. The sides of the collar are flat to convex, usually the 

 former. The full conical bowl changes from about 25° below 

 the collar to 45° near the apex, and there is a small, conical 

 aboral horn (25°) with a length of only o.i oral diameter. 



The wall is coarsely reticulated with subuniform hexagonal 

 polygons. There are about 25 of these across the face at the 

 throat and 45 to 50 from the throat to the apex. Those of 

 the collar do not differ from those of the throat, and they 

 are only slightly smaller aborally. The wall is about o.oi 

 oral diameter in thickness. There is but a single layer of 

 polygons, even in the nuchal shelf. The lumen follows the 

 outer contour neatly save as the low internal shelf breaks the 

 collar and bowl into two divisions. The aboral horn is 

 hollow and the tip is usually open. 



Length, 267 to 400)^1. 



There is considerable variation in these large loricae. In 

 actual length, Kofoid and Campbell (1929) record 250 to 

 3201.1 and Hada (1932^) 300U; the Carnegie specimens are 

 267 to 400(1, and in proportions also they are more variable. 



