88 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



There are 5 pump and 14 net samples, of which 5 were 

 taken at 50 meters and 14 at 100 meters. Maximum fre- 

 quency, 27 per cent at station 45; other records above mini- 

 mum (2 to 9 per cent) from stations 25, 35, 41, 65, 67, 136, 

 151, 152; average in Pacific net samples, 6.3 per cent. 



Temperature: Atlantic, pump sample 23? 10, net samples 

 i4?6o-20?99 (i7?79); Pacific, i 4 ?32-20?52 (i6?68) and 

 n?48-2i?69 ( 18^48), respectively. Salinity: Atlantic, pump 

 sample 36.59, net samples 35.70-36.04 (35.87); Pacific, 33.40- 

 34.86 (34.33) and 34.30-35.21 (34.45), respectively. Density: 

 Atlantic, pump sample 25.13, net samples 25.30-26.62 (25.96); 

 Pacific, 24.53-25.75 (25.05) and 24.24-26.50 (25.45), respec- 

 tively. pH: Atlantic, pump sample 8.21, net samples 7.93- 

 8.14 (8.03); Pacific, 7.87-8.37 (8.14) and 7.76-8.39 (8.04), 

 respectively. 



Xystonellopsis tenuirostris (Brandt) Kofoid and Campbell 



Xystonellopsis tenuirostris, Kofoid and Campbell, 1929, p. 250, 

 fig- 479- 



The fairly short lorica, with suboral swelling, short pedicel, 

 and pencil-shaped lance, has a length of 4.25 oral diameters. 

 The thin oral margin is outspread. The bowl swells within 

 0.45 oral diameter to 1.1 oral diameters, and then contracts 

 (15 ) within an oral diameter. Below the swollen region 

 the bowl is subcorneal (14° in the anterior 0.29 and 28 in 

 the posterior 0.25 total length). The pedicel is subcylin- 

 drical, with distal flare forming the barely extended skirt, 

 and with a length of nearly 0.24 total length. The lance is 

 conical (12 ), 0.4 oral diameter in length, and sharply 

 pointed at the free tip. 



The wall has a thickness of 0.06 oral diameter in the 

 widest region, and half as much in the lower bowl. There 

 are thin laminae which enclose hyaline substance. The 

 lumen is unaltered by the suboral thickening and extends 

 into the lance as a narrow canal. The pedicel has 12 sub- 

 vertical ridges on its whole length. 



There are 2 oval macronuclei. 



Length, 240 to 270^1. 



Xystonellopsis tenuirostris resembles X. javata in form, 

 but has a wide suboral thickening and a less slender, more 

 cylindrical pedicel. Xystonellopsis gaussi is taller and has a 

 thicker pedicel and longer lower bowl. 



Recorded from seven stations, two in the Atlantic and five 

 in the Pacific, as follows: two (25, 27) in the Atlantic equa- 

 torial region, two (44, 46) in the Galapagos region, one (98) 

 in the region of South Pacific island fields, one (101) in the 

 North Pacific trade region, and one (145) in the North 

 Pacific middle latitudes. 



There are 4 pump and 3 net samples, of which 2 were 

 taken at 50 meters and 5 at 100 meters. Maximum fre- 

 quency, 18 per cent at station 145; 3 per cent at station 98, in 

 a pump sample. 



Temperature: Atlantic, net samples i4?6o-i8?o8 (i6?34); 

 Pacific, pump samples i4?22-26?89 (22?37). Salinity: 

 Atlantic, net samples 35.70-36.03 (35.86); Pacific, net sample 

 34.71, pump samples 35.04-35.33 (35.18). Density: Atlantic, 

 net samples 26.06-26.62 (26.34); Pacific- pump samples 



22.97-26.19 (24.17). pH: Atlantic, net samples 7.93-8.09 

 (8.01); Pacific, net sample 8.31, pump samples 7.88-8.23 

 (8.10). 



PARUNDELLA )6rgensen emended 



Parundella, Kofoid and Campbell, 1929, pp. 225-226. 



Parundella was formerly included as the first among the 

 Xystonellidae. Because of its hyaline, clear wall, rarely 

 with prismatic elements, and smooth, fine finish, it is here 

 placed among the more advanced genera. The oral margin, 

 though simple, is much as in Xystonellopsis. Parundella 

 leads toward the Undellidae and also toward the Petalo- 

 trichidae, in which families the wall is similar or close. In 

 lorm and in the occasional presence of typical wall char- 

 acters, it agrees with the other Xystonellidae. 



Parundella is common in cooler seas as well as sometimes 

 in the deeper waters of the tropics. 



Eight species are described here. 



Parundella aculeata Jorgensen 

 Parundella aculeata, Kofoid and Campbell, 1929, p. 226, fig. 430. 



The rather tall, elongated lorica, with fairly short, con- 

 tracted aboral region and lance, has a length of 4.45 oral 

 diameters. The thin oral margin is sharp-edged. The bowl 

 is subcylindrical in the anterior 0.51 total length. The lower 

 section is inverted conical (45 ), with a length of nearly 

 0.29 total length. At its lower end is the narrow, needle-like 

 (8°) lance, the length of which is about 0.2 total length; the 

 free tip is sharp. 



The hyaline wall has laminae with homogeneous material 

 enclosed. Its thickness hardly reaches 0.1 oral diameter and 

 is practically uniform. The cavity enters the lance but does 

 not continue its whole length. 



Length, 143U. 



Parundella aculeata differs from P. longa in having a 

 shorter aboral cone and longer lance; it is also shorter. 

 Parundella translucens flares suborally and has a shorter, less 

 differentiated lance. Parundella major is broader, with a 

 longer aboral cone and shorter lance. 



Recorded from six stations, four in the Atlantic and two 

 in the Pacific, as follows: four (22, 24, 25, 30) in the Atlantic 

 equatorial region, and two (40, 41) in the Galapagos region. 



There are 2 pump and 5 net samples, ot which 1 was taken 

 at 50 meters and 6 at 100 meters. Frequency, minimum. 



Temperature: Atlantic, net samples i4?6o-25?54 (i9?26); 

 Pacific, pump samples i3?93— 14?55 (i4?24). Salinity: 

 Atlantic, net samples 35.61-36.40 (35.92); Pacific, pump 

 samples 34.99-35.02 (35.00). Density: Atlantic, net samples 

 24.25-26.62 (25.47); Pacific, pump samples 26.11-26.21 

 (26.16). pH: Atlantic, net samples 7.93-8.28 (8.07); Pacific, 

 pump samples 7.85-7.92 (7.88). 



Parundella acuta Kofoid and Campbell 



Parundella acuta Kofoid and Campbell, 1929, p. 226, fig. 430. 



The stout, bell-shaped lorica, with lateral concavity pro- 

 duced by a double expansion, and with short aboral cone 



