30 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



26?o6-27?03 (26?47). Salinity: Atlantic, net samples 35.61- 

 36.81 (36.07); Pacific, pump samples 34.70-36.04 (35.37), 

 net samples 35.24-35.95 (35.68). Density: Atlantic, net 

 samples 23.98-26.62 (25.66); Pacific, pump samples 22.31- 

 24.54 (23.42), net samples 22.91-23.75 (23.40). pH: At- 

 lantic, net samples 7.93-8.30 (8.13); Pacific, pump samples 

 8.19-8.22 (8.20), net samples 8.19-8.32 (8.23). 



Codonellopsis pusilla (Cleve) Kofoid and Campbell 



(Figure 8) 



Codonellopsis pusilla, Kofoid and Campbell, 1929, p. 87, fig. 

 146; Hada, 193:!/', pp. 561-562, fig. 12. 



The short, plump lorica, with short collar of few turns and 

 longer swollen bowl with blunted aboral end, has a length of 

 3.08 oral diameters. The oral margin is thin and rounded. 

 The hyaline collar is a concave segment of a cone (14°) the 

 basal diameter of which is 1.28 oral diameters. It is com- 

 posed of 5 turns, the lower 3 of which are wider than the 

 upper 2. There is a single ovate fenestra between the last 2 

 turns. The swollen, dense bowl expands from the throat, 

 reaches nearly 2.0 oral diameters at its equator, and then 

 contracts (within 125°) to the broadly oval aboral end. 



The wall reaches 0.07 oral diameter in thickness in the 

 bowl, where it is practically uniform; in the collar it is less 

 than half as thick. There is only a single layer of rectangular 

 secondary alveoles in the bowl; in both collar and bowl very 

 fine primary alveoles are visible under the best magnifica- 

 tion. The outer surface is made up of distinct but small 

 hexagons. Rarely are there a few agglomerated alveolar 

 flecks on the surface. 



Length, 56 to 591X. 



Some loricae have pointed instead of ovate aboral ends. 

 The collar may have as many as 13 narrow spiral turns, 

 fenestrae may be lacking, and the length may reach 2.6 oral 

 diameters. 



Codonellopsis pusilla differs from C. contracta in size and 

 proportions, in having fewer fenestrae if any, and in the 

 shape of the aboral end, which is decidedly broad in con- 

 tracta. These two are the smaller species of the cooler, 

 northern ocean, and are not readily comparable with those 

 of the tropics or Antarctic; among the latter are two (C. 

 glacilis and C. gaussi) peculiar species, the origin of which 

 must have been in tropical species. So also must have been 

 the origin of the northern neritic C. jrigida and C. borealis. 

 The former of these last two species is much like pusilla. 



Recorded from five stations, two in the Atlantic and three 

 in the Pacific, as follows: two (5-6, 6) in the Atlantic drift, 

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

 one (118) in the East Asiatic marginal sea. 



There are r pump sample and 6 net samples, of which 3 

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

 meters. Maximum frequency, 50 per cent at station 117; 

 other records above minimum (2 to 23 per cent) from 

 stations 6, 116, 118; averages, 11. 2 and 33 per cent in Atlantic 

 and Pacific net samples, respectively. 



Temperature: Atlantic, net samples ii?62-i2?44 (ii?97); 

 Pacific, pump sample io?i8, net samples ii?i8-i2?56 



(ii?87). Salinity: Atlantic, net samples 35.51-35.55 (35.53); I 

 Pacific, pump sample 33.61, net samples 33.79-34.22 (34.00). 

 Density: Atlantic, net samples 26.95-27.21 (27.03); Pacific, 

 pump sample 25.85, net samples 25.83-25.89 (25.86). pH: I 

 Atlantic, net samples 8.08-8.15 (8.12); Pacific, pump sample 

 8.21, net samples 8.06-8.11 (8.08). 



Codonellopsis speciosa Kofoid and Campbell 

 (Figure 4) 

 Codonellopsis speciosa Kofoid and Campbell, 1929, p. 88, fig. 174. 



The elongated lorica, with long, little -everted collar, stout 

 bowl, and stout, long aboral horn, has a length of 4.2 oral 

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

 long collar (0.42 total length) has some suboral eversion and 

 a low, rounded brim. The collar is a truncated segment of 

 an inverted cone (8°) and has a basal diameter of 0.81 oral 

 diameter. It is made up of 18 subequal spiral turns. The 

 neck is swollen (0.85 oral diameter) and then constricted 

 (0.81 oral diameter), all within 0.22 oral diameter. The 

 wide, elongated bowl rapidly swells to a maximum of 1.26 

 oral diameters at 0.59 total length below the rim. Below 

 this level it gradually decreases (75° to 80°), reaching at 

 0.75 total length a diameter of nearly 0.56 oral diameter. 

 Below this last level it becomes a short segment of an in- 

 verted truncated cone (35°) with a length of 0.37 oral diam- 

 eter, and has a diameter at its lower end of almost 0.3 oral 

 diameter. The aboral horn is conical (15'^), with a length 

 of 0.7 oral diameter, and is blunted at its free tip. 



The thin, hyaline collar (0.02 oral diameter in thickness) 

 is in contrast with the thicker (0.075), dense bowl. There 

 are thin laminae which in the collar develop hyaline enclosed 

 material, and in the bowl two or three layers of small prisms; 

 large tertiary structures in one or two layers enclose the 

 secondary prisms. The surface of the bowl shows a faint 

 tracery of large, circular tertiary areas. The cavity of the 

 bowl is cut off from that of the horn by a horizontal dia- 

 phragm. 



Length, 181 to 2251.1. 



In the aboral projection of the bowl as well as in the 

 greater elongation, the Carnegie loricae difler from those 

 originally described. The collars are longer, and the horns 

 more emergent. 



Codonellopsis speciosa has a longer, stouter bowl and 

 shorter, stouter horn than C. pacifica. Its collar is longer, its 

 bowl different, and its horn longer than in C. parva. Codo- 

 nellopsis infiata has an even wider, shorter bowl, a longer, 

 more slender aboral horn, and a collar with wavy margins 

 on the spiral turns. 



Recorded from three stations, one in the Atlantic and two 

 in the Pacific, as follows: one (23) in the Atlantic equatorial 

 region, one (45) in the Galapagos region, and one (152) in 

 the Pacific equatorial region. 



There are 2 pump samples from the Pacific, and 3 net 

 samples, of which 2 were taken at 50 meters and 3 at 100 

 meters. Maximum frequency, 2 per cent at station 152; 

 other records all minimum; average in Pacific pump samples, 

 1.5 loricae. 



