28 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



larger, rectangular, thick-walled tertiary areas. The surface 

 of the bowl clearly shows the tertiary areas as hexagons, 

 about 20 in number, across its equator, and 10 to 14 second- 

 ary hexagons are enclosed by each of the thicker-walled, 

 larger areas. The horn is similar to the bowl. The cavity of 

 the horn is cut off from that of the bowl by a diaphragm 

 formed by the inner lamina. This cavity is wide and rather 

 closely follows the outer contour. 



Length, 125 to 207(1. 



Codonellopsis turgida and C. pura both have much shorter 

 and wider bowls than the present species. The collar of C. 

 minor is longer than in these two species. Codonellopsis 

 parva has a longer horn, wider bowl, and shorter, more 

 conical collar. Codonellopsis calijorniensis hardly has a horn 

 at all, and its bowl is wider than in minor. Codonellopsis 

 speciosa has a longer horn and different bowl. 



Recorded from ten stations, five each in the Atlantic and 

 the Pacific, as follows: one (16) in the Gulf Stream, three 

 (24, 25, 27) in the Atlantic equatorial region, one (33) in 

 the Caribbean Sea, three (41, 46, 80) in the Galapagos 

 region, one (107) in the North Pacific trade region, and one 

 (153) in the Pacific equatorial region. 



There are 9 pump and 3 net samples, of which 7 were 

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

 quency, 3 per cent at station 46; frequency 2 per cent at 

 stations 16, 24; other records, minimum; average in Atlantic 

 net samples, 1.5 per cent. 



Temperature: Atlantic, pump samples i4?6o-28?25(23?i3), 

 net samples 23?i2-23?64 (23?38); Pacific, 22?73-26?92 

 (24'; 12) and i4?55, respectively. Salinity: Atlantic, pump 

 samples 35.70-36.25 (36.11), net samples 36.00-36.41 (36.20); 

 Pacific, 34.73-36.21 (35.27) and 35.02, respectively. Density: 

 Atlantic, pump samples 23.23-26.02 (24.66), net samples 

 24.67-24.84 (24.75); Pacific, 22.63-24.70 (23.82) and 26.11, 

 respectively. pH: Atlantic, pump samples 7.93-8.30 (8.16), 

 net samples 8.14-8.23 (8.18); Pacific, 8.16-8.28 (8.21) and 

 7.92, respectively. 



Codonellopsis orientalis Hada 



Codonellopsis orientalis Hada, 19326, pp. 563-564, fig. 15. 



The fairly tall, clean lorica, with subcylindrical collar, 

 ovate bowl, and broadly convex-conical aboral region, has a 

 length of 2.60 to 2.76 oral diameters. The thin oral margin 

 is rounded. The collar is generally cylindrical, although 

 there is slight suboral flare (45°) within the upper 0.21 of 

 the length of the collar in some loricae; in these the aboral 

 diameter of the collar is 0.91 oral diameter. The collar is 

 made up of 8 to 12 spiral turns, the uppermost 3 or 4 being 

 much narrower than the others, which are more or less uni- 

 form. Oval fenestrae (the full width of a turn) occur in the 

 sixth and also sometimes in the seventh turn. The collar has 

 a length of 0.3 to 0.4 total length, and commonly, but not 

 always, bulges in the middle (0.92 oral diameter). The 

 ovate bowl expands from the neck to its greatest diameter of 

 1.52 to 1.57 oral diameters near 0.55 total length from the 

 rim. Below this level the bowl contracts with full convex- 

 conical sides (85 to 105 ) to the blunt, rounded aboral end. 



The wall of the collar is hyaline and uniformly thin (0.04 



oral diameter), and has fine primary alveoles enclosed within 

 its laminae. The wall of the dense bowl is thicker (0.08 

 oral diameter) across the middle and thins above and below; 

 it is made up of large, blobby secondary prisms. The outer 

 surface is decidedly irregular, with coarse blocks of alveolar 

 material of diverse shapes. 



Length, 84 to 931.1. 



Codonellopsis orientalis bears some likeness to members 

 of the C. morchella group, but differs from them mainly in 

 the shape of the aboral end. This tropical assembly of 

 species has a distinctive fades rather difficult to describe in 

 words. 



Recorded from one station (117) in the North Pacific 

 middle latitudes, in 2 net samples, 1 each taken at 50 and 

 100 meters. Frequency not over 2 per cent. 



Temperature, 8?93-i2?56 (io?74); salinity, 34.06-34.22 

 (34.14); density, 25.89-26.41 (26.15); pH, 7.98-8.06 (8.02). 



Codonellopsis pacifica ( Brandt) emended Kofoid 

 and Campbell 



Codonellopsis pacifica, Kofoid and Campbell, 1929, p. 85, fig. 

 '75- 



The moderately tall lorica, with collar longer than bowl, 

 wide, globose bowl, and long, narrow horn, has a length of 

 3.67 oral diameters. The thin oral margin is everted and 

 flaring (63 ) within the uppermost one-tenth. The collar is 

 0.41 total length, truncate, inverted conical (5 ), with a 

 diameter at the lowermost end of nearly 0.75 oral diameter, 

 and with bare lateral concavity. There are 24 spiral turns, 

 the upper 6 being narrow and the remainder wider. Of the 

 wide ones, some are narrower than others. The bowl has a 

 more or less cylindrical neck with a width of 0.3 oral diam- 

 eter, and a diameter at its lower end of 0.91 oral diameter. 

 The bowl rounds from this neck to 1.17 oral diameters at 

 0.57 total length below the rim, and then contracts convex- 

 conically (90 ) to the aboral end, the diameter of which is 

 less than 0.33 oral diameter. The conical (6°) aboral horn 

 has a length of 1.0 oral diameter, and its free tip is blunt. 



The wall of the collar is thin (0.02 oral diameter), and that 

 of the bowl is thicker (0.08). Thin, hyaline laminae enclose 

 colorless material, and the bowl has single or double layers 

 of large, often rectangular secondary prisms. The surface 

 of the bowl has rather small rounded areas, and scattered yet 

 larger round areas of several sizes. Coccoliths are common 

 on the surface. The horn has a similar surface and is hol- 

 low and irregularly but widely canaliculate, and has a thin, 

 depressed diaphragm which cuts its cavity from that of the 

 bowl. The collar is glass-clear and the bowl dense. 



Length, 195 to 270^1, 



Codonellopsis pacifica differs from C. longa in being 

 shorter and rather more plump, and having a shorter horn 

 and a collar with fewer turns. The bowl is not so expanded 

 as that of C. inflata; the collar is longer than in C. speciosa, 

 and less conical than in C. orthoceras. 



Recorded from four stations in the Pacific, as follows: 

 three (45, 46, 78) in the Galapagos region, and one (81) in 

 the region of South Pacific island fields. 



