io6 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



in the Pacific equatorial region, five (45, 46, 47, 77, 80) in 

 the Galapagos region, two (54, 58) in the South Pacific 

 middle latitudes, six (81, 82, 89, 92, 158, 159) in the region 

 of South Pacific island fields, two (100, 151) in the North 

 Pacific trade region, one (113) in the North Pacific middle 

 latitudes, and three (131, 146, 148) in the California region. 

 There are 23 pump and 32 net samples, of which 12 were 

 taken at the surface, 19 at 50 meters, and 24 at 100 meters. 

 Maximum frequency, 12 per cent at station 29; other records 

 above minimum (2 to 11 per cent) from stations 25, 27, 28, 



31. 33. 34> 113. 131, 151. 152, 158, 159; averages in net 

 samples, 4.2 and 2.7 per cent in the Atlantic and Pacific, re- 

 spectively. 



Temperature: Atlantic, pumpsamples i8?o8-26?57(22?o7), 

 net samples i4?6o-27?56 (23?3i); Pacific, 22?04-27?99 

 (26?03) and ii?48-28?6o (2i?98), respectively. Salinity: 

 Atlantic, pump samples 36.03-36.81 (36.39), net samples 

 3570-37-I5 (i^.^^)-^ Pacific, 34.39-36.46 (35-64) and 33.36- 

 36.04 (34.28), respectively. Density: Atlantic, pump samples 

 23.84-26.26 (25.23), net samples 23.47-26.62 (24.84); Pacific, 

 21.95-25. II (23.44) and 22.31-26.50 (24.27), respectively. 

 pH: Atlantic, pump samples 8.09-8.32 (8.20), net samples 

 7.93-8.32 (8.20); Pacific, 8.14-8.29 (8.19) and 7.76-8.39 

 (8.17), respectively. 



Proplectella parva Kofoid and Campbell 

 Proplectelta parva Kofoid and Campbell, 1929, p. 280, fig. 544. 



The short, conical lorica, with thickened wall, has a length 

 of 2.2 oral diameters. The oral margin is sharp-edged. The 

 upper half of the bowl is cylindrical, although there is a 

 little expansion (1.04 oral diameters) in the middle region of 

 a few individuals. The aboral section is conical (50°) and 

 slighdy concave, and has a sharply pointed free tip. 



The wall reaches 0.18 oral diameter in thickness in the 

 inner collar; it thins down a litde in the anterior part and 

 becomes distinctly, but not suddenly, thinner aborally. The 

 inner collar is diffused, o.i total length in length, funnel-like 

 (40°), and 0.9 oral diameter in diameter at the lower end. 

 There are thin laminae and enclosed hyaline matter; rarely 

 are there coccoliths. 



Length, 44 to 63^. 



Proplectella parva differs from both P. acuta and P. grandis, 

 not only in decided shortness, but also in the thickened wall. 

 In P. subcattdata the thickening is not continued to the lower 

 bowl. 



Recorded from eight stations, one in the Atlantic and seven 

 in the Pacific, as follows: one (2) in the Gulf Stream, two 

 (40, 43) in the Galapagos region, two (64, 65) in the South 

 Pacific middle latitudes, two (116, 117) in the North Pacific 

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



There are 2 pump and 9 net samples, of which i was taken 

 at the surface, 4 at 50 meters, and 6 at 100 meters. Maxi- 

 mum frequency, 22 per cent at station 117; other records 

 above minimum (2 to 9 per cent) from stations 64, 65, 116, 

 136; average in Pacific net samples, 10.8 per cent. 



Temperature: Adantic, net sample 20?35; Pacific, pump 

 samples i5?9o-i6?53 (i6?2i), net samples 8?93-i8?87 



(i3?33). Salinity: Adantic, net sample 36.41; Pacific, pump 

 samples 34.54-34.95 (34.74), net samples 34.02-35.02 (34.49). 

 Density: Atlantic, net sample 25.76; Pacific, pump samples 

 25.43-25.60 (25.51), net samples 24.41-26.41 (25.24). pH: 

 Atlantic, net sample 8.21; Pacific, pump samples 7.93-8.10 

 (8.01), net samples 7.87-8.39 (8.09). 



Proplectella pentagona (Jorgensen) Kofoid and Campbell 



Proplectella pentagona, Kofoid and Campbell, 1929, p. 281, fig. 

 531- 



The moderate-sized lorica, with pentagonal outline, has a 

 length of 2.14 oral diameters. The oral margin is thin. The 

 bowl expands regularly (20°) to a diameter of 1.5 oral diam- 

 eter at 0.75 total length below the rim. The posterior section 

 is a short, wide cone (105°). The angles are all blunted, as 

 is the aboral end. 



The wall attains a maximum thickness of 0.14 oral diam- 

 eter and then thins down to at least a third as much aborally. 

 The inner collar contracts (32°) to a diameter of 0.82 oral 

 diameter, its length being 0.4 oral diameter. The laminae 

 enclose hyaline substance. 



Length, 51 to 53^1. 



Proplectella pentagona differs from P. amphora in the 

 lower level of the expansion, and the conical, pointed aboral 

 region. It lacks the subcylindrical middle section of P. bi- 

 angidata and the aboral narrowness of P. subangidata. It is 

 most distinctive. 



Recorded from eleven stations, two in the Atlantic and 

 nine in the Pacific, as follows: two (25, 26) in the Adantic 

 equatorial region, two (45, 46) in the Galapagos region, four 

 (135, 146, 147, 148) in the California region, two (144, 145) 

 in the North Pacific middle latitudes, and one (150) in the 

 North Pacific trade region. 



There are 11 pump and 2 net samples, of which 2 were 

 taken at the surface, 4 at 50 meters, 6 at 100 meters, and i at 

 150 meters. Frequency, 2 per cent at stations 45, 147, 148; 

 other records minimum; average in Pacific pump samples, 

 1.2 loricae. 



Temperature: .\tlantic, pump samples i4?6o-24?io(i9?35), 

 net sample i4f6o; Pacific, i4?73-23?4i (20? 16) and i9?27, 

 respectively. Salinity: Atlantic, pump samples 35.70-36.14 

 (35.92), net sample 35.70; Pacific, 34.27-35.32 (34.89) and 

 35.04, respectively. Density: Atlantic, pump samples 24.49- 

 26.62 (25.55), ^^^ sample 26.62; Pacific, 23.96-25.48 (24.60) 

 and 25.00, respectively. pH: Atlantic, pump samples 7.93- 

 8.21 (8.07), net sample 7.93; Pacific, 8.12-8.34 (8.24) and 

 8.29, respectively. 



Proplectella perpusilla Kofoid and Campbell 



Proplectella pcrpusdla Kofoid and Campbell, 1929, p. 281, fig. 

 524; Marshall, 1934, p. 653, fig. 32. 



The short, ovate lorica, with wide-open aperture, has a 

 length of 1.59 oral diameters. The oral margin is sharp. The 

 bowl is subcylindrical in its upper tenth, then expands rather 

 suddenly (38°) to a diameter of 1.35 oral diameters near 

 0.47 total length from the rim. The lower bowl contracts 



