TAXONOMY AND DISTRIBUTION 



119 



The Carnegie loricac arc rather longer than the usual run 

 and more tubular in the upper shalt. 



Eutintinnus apertus has a wider aboral cylinder than docs 

 E. angustatus, its closest relative. Eutintinnus tubes lacks the 

 intermediate subconical section and is a brackish-water form. 

 Eutintinnus tubulosus tapers throughout, and E. pinguis and 

 E. pacificus have median bulge and wider aboral ends. 



Recorded from ten stations, two in the Atlantic and eight 

 in the Pacific, as follows: one (18) in the Sargasso Sea, one 

 (22) in the Atlantic equatorial region, two (41, 44) in the 

 Galapagos region, one (60) in the South Pacific middle lati- 

 tudes, one (109) in the North Pacific trade region, two (113, 

 145) in the North Pacific middle latitudes, one (132) in the 

 California region, and one (153) in the Pacific equatorial 

 region. 



There are 1 1 pump and 7 net samples, of which 2 were 

 taken at the surface, 5 at 50 meters, and 11 at 100 meters. 

 Maximum frequency, 8 per cent at station 113; other records 

 above minimum (2 to 3 per cent) from stations 44, 109, 153; 

 average in Pacific net samples, 3.5 per cent. 



Temperature: Atlantic, pump samples 20?32-22? 12 (21 ?22), 

 net samples i7?50-20?32 (i8?9i); Pacific, i3?62-24?i9 

 (20^97) and i9?8i-27?2i (22?33>, respectively. Salinity: 

 Atlantic, pump samples 36.81-36.82 (36.81), net sample 

 36.81; Pacific, 33.40-35.02 (34.50) and 34.66-36.33 (35.25), 

 respectively. Density: Atlantic, pump samples 25.58-26.07 

 (25.82), net sample 26.07; Pacific, 23.25-26.11 (24.67) and 

 23.83-24.72 (24.16), respectively. pH: Atlantic, pump 

 samples 8.21-8.24 (8.22), net sample 8.21; Pacific, 7.92-8.34 

 (8.26) and 8.18-8.28 (8.22), respectively. 



Eutintinnus birictus Kofoid and Campbell 

 Tintinnus birictus Kofoid and Campbell, 1929, p. 332, fig. 634. 

 The long, slender lorica, with suboral and aboral flares, 

 with both ends having brims, and with tapering shaft, has a 

 length of 7.65 oral diameters. The oral margin has a thin, 

 molded brim. There is some suboral flare (23 ) within the 

 upper 0.1 total length. The long shaft tapers (3 ), its 

 diameter just below the flare being 0.53 oral diameter. The 

 aboral flare (io°) occupies about 0.67 oral diameter. Near 

 its lower end it flares a bit more (48 ). The wide-open 

 aboral end (0.8 oral diameter) has a narrow, molded brim. 

 The hyaline wall is thin. 

 Length, 377 to 650(1. 



Eutintinnus birictus is much longer than E. elongatus and 

 has more suboral flare. It is wider open and less tapering 

 below than that species. 



Recorded from one station (66) in the South Pacific 

 middle latitudes, in a pump sample taken at 50 meters. 

 Frequency, minimum. 



Temperature, i-j°M; salinity, 34.78; density, 25.16; pH, 

 8.10. 



Eutintinnus brandti Kofoid and Campbell 

 (Figure 122) 

 Tintinnus brandti Kofoid and Campbell, 1929, pp. 332-333. fig. 



628. 

 The tall, stout lorica, with flaring ends and swollen shait, 



has a length of 5.05 oral diameters. The thin oral margin 

 has a low, scarcely evident, molded brim. The suboral flare 

 (43°) is within 0.39 oral diameter, and its diameter at the 

 lower end is nearly 0.7 oral diameter. The long shaft swells 

 gradually from the neck and reaches 0.72 oral diameter near 

 0.37 total length from the rim. The swollen region occupies 

 approximately 0.6 total length. At the lower level its diam- 

 eter is 0.57 oral diameter, and again below it contracts (6 ) 

 for 0.85 oral diameter, with a diameter at the lower end ol 

 about 0.48 oral diameter. The concave aboral flare (42°) is 

 brimless, and of a length of about 0.33 oral diameter; its own 

 diameter is 0.69 oral diameter. 



The uniformly thin wall (0.02 oral diameter) is hyaline. 

 Length, 331(1. 



The Carnegie loricae lack the aboral brim usual in most 

 specimens. 



Eutintinnus brandti is smaller than E. latus (353 to 404(1) 

 and bulges somewhat more. It has submedian bulge, lack- 

 ing in E. fraknoii, and aboral flare, lacking in E. turgescens. 

 Eutintinnus medius is shorter, with less abrupt flare. 



Recorded from eighteen stations, four in the Atlantic and 

 fourteen in the Pacific, as follows: three (18, 19, 20) in the 

 Sargasso Sea, one (23) in the Atlantic equatorial region, five 

 (44, 71, 72, 73, 80) in the Galapagos region, four (85, 90, 

 93, 97) in the region of South Pacific island fields, two (101, 

 no) in the North Pacific trade region, two (137, 146) in the 

 California region, and one (142) in the North Pacific middle 

 latitudes. 



There are 17 pump and 7 net samples, of which 8 were 

 taken at the surface, 7 at 50 meters, and 9 at 100 meters. 

 Maximum frequency, 13 per cent at station 18; in pump 

 samples there were 1 to 11 loricae, average 2.7. 



Temperature: Atlantic, net samples 20?32-25?3i (22?54); 

 Pacific, net sample 20?07, pump samples i6?9o-28?74 

 (24?34). Salinity: Atlantic, net samples 36.02-37.15 (36.76); 

 Pacific, net sample 34.32, pump samples 34.47-36.24 (35.26). 

 Density: Atlantic, net samples 24.89-26.07 (25.51); Pacific, 

 net sample 24.24, pump samples 21.95-25.30 (23.70). pH: 

 Atlantic, net samples 8.18-8.27 (8.22); Pacific, net sample 

 8.26, pump samples 8.03-8.34 (8.24). 



Eutintinnus colligatus Kofoid and Campbell 

 Tintinnus colligatus Kofoid and Campbell, 1929, p. 3a, fig. 

 652. 



The moderately long, tall, slender lorica, with abrupt 

 aboral constriction, has a length of 5.0 oral diameters. The 

 thin oral margin has a narrow, molded brim. The suboral 

 funnel flares (38 ) within the anterior 0.5 oral diameter; 

 its aboral diameter is 0.6 oral diameter. The long shaft 

 tapers (4 ) regularly. At 0.2 oral diameter above the aboral 

 end is a narrow constriction of somewhat less than 0.3 oral 

 diameter. There is an aboral flare (45 ) directly posterior 

 to the peculiar constriction. The rimless aboral end has a 

 diameter of 0.35 oral diameter. 



The hyaline wall is uniformly thin. 



Length, 260 to 295(1. 



No other species has the unique aboral constriction. 



