122 



OCEANIC TINTINNOINA OF LAST CRUISE OF CARNEGIE 



deeper levels. Maximum frequency, 36 per cent at station 

 112; other records above minimum (2 to 15 per cent) from 

 stations 15, 23, 24, 33, 35, 35-36, 37, 40, 41, 42, 45, 46, 47, 69, 

 77, 78, 109, 113, 131, 136, 148, 152, 157; averages, 2.1 and 

 5.2 per cent in Atlantic and Pacific net samples, respectively; 

 111 pump samples there were 1 to 13 loricae. 



Temperature: Atlantic, pumpsamplesi4?95-28?49(24?35), 

 net samples i4?02- 2 6?7 9 (20?54); Pacific, 8?9o-2 7 ?85 

 ( 2 o?9o) and 1 ^48-28? 14 (ao?49), respectively. Salinity: 

 Atlantic, pump samples 35.63-36.75 (36.08), net samples 

 35.23-36.81 (36.10); Pacific, 33.40-36.09 (34.36) and 31.62- 

 36.04 (34.83), respectively. Density: Atlantic, pump samples 

 23.14-26.12 (24.31), net samples 23.79-26.91 (25.39); Pacific, 

 21.97-26.19 (24.04) and 22.80-26.50 (24.45), respectively. 

 pH: Atlantic, pump samples 8.18-8.29 (8.22), net samples 

 7.93-8.32 (8.15); Pacific, 7.87-8.39 (8.30) and 7.76-8.39 

 (8.09), respectively. 



Eutintinnus macilentus (Jorgensen) emended Kofoid 

 and Campbell 

 Tintinnus macilentus, Kofoid and Campbell, 1929, p. 335, fig. 



637- 

 The rather short, decidedly concave, tapering lorica, with 

 both ends flaring, has a length of 3.62 oral diameters. The 

 thin oral margin has a thickened brim. The suboral 0.48 of 

 the shaft flares (12 ) and reaches at the lower end a diam- 

 eter of 0.5 oral diameter. Below this level it again flares 

 (8°) less widely and reaches a diameter of 0.37 oral diam- 

 eter at 0.5 oral diameter above the aboral end. The aboral 

 flare (20°) is short and wide. The open aboral end has no 

 brim; its diameter is 0.56 oral diameter. 

 The uniformly thin wall is hyaline. 

 Length, 136 to 290U. 



Considerable variation in length and amount of aboral 

 constriction occurs. 



Eutintinnus macilentus is much smaller than E. jra\non 

 and its shaft has much more pronounced constriction. It is 

 decidedly shorter and stouter than E. elongatus. Eutintinnus 

 attcnuatus has a short, wide suboral funnel, lacks aboral 

 flare, and is much longer; similarly, E. colligatus has a 

 funnel but has a specially contracted region aborally. Had 

 macilentus teeth, it would be close to E. turns. 



Recorded from seven stations, five in the Atlantic and 

 two in the Pacific, as follows: four (17, 18, 19, 21) in the 

 Sargasso Sea, one (22) in the Atlantic equatorial region, 

 and two (49, 85) in the region of South Pacific island 

 fields. 



There are 4 pump and 7 net samples, of which 4 were 

 taken at the surface, 5 at 50 meters, and 2 at 100 meters. 

 Maximum frequency, 5 per cent at station 21; other records 

 in net samples, minimum; in pump samples there were 1 to 

 4 loricae; average, 2.2. 



Temperature: Atlantic, pump samples 21 ? 85-26^57 (24^98), 

 net samples i7?50-26?57 (22?36); Pacific, net samples 

 23?38-27?89 (25^63). Salinity: Atlantic, pump samples 

 36.28-37.15 (36.60), net samples 36.28-37.15 (36.76); Pacific, 

 net samples 36.07-36.24 (36.21). Density: Atlantic, pump 



samples 23.84-25.49 (24.60), net samples 23.84-26.07 (25.09); 

 Pacific, net samples 23.38-24.72 (24.05). pH: Atlantic, 

 pump samples 8.27-8.32 (8.28), net samples 8.21-8.32 (8.26); 

 Pacific, net samples 8.22-8.27 (8.24). 



Eutintinnus magnificus, new species 



(Plate 1, figure 10; figure 124) 



The elongated, tubular lorica, with flaring, rimmed oral 

 margin, has a length of 8.57 oral diameters. The oral margin 

 has a rim 0.09 oral diameter in width; this rim extends like 

 a rounded, almost recurved flange about the aperture. The 

 shaft arches concavely from its inner edge and reaches a 

 diameter of 0.64 oral diameter at 0.58 oral diameter below 

 the opening, forming a collar-like section. The long shaft 

 narrows continuously until it reaches its least diameter at 

 8.3 oral diameter below the rim; this minimum diameter is 

 0.28 oral diameter, or about 0.3 diameter of the shaft at its 

 upper end. The shaft as a whole forms a straight-sided in- 

 verted truncated cone (3 ). Below the narrowest place the 

 lorica again flares outward, as a wide, truncated cone (6o°) 

 with barely concave sides. The aboral aperture, which 

 forms the base of the aboral cone, has a diameter of 0.84 

 oral diameter. There is no aboral flange. 



The wall is exceedingly thin, shows no trace of laminae, 

 and is glass-clear. There are no exterior markings. 



Length, 300^1; diameter, oral 3511, aboral 32|.l, minimum 

 diameter of shaft 13ft. 



Eutintinnus magnificus resembles E. birictus in general 

 form and proportions, being 8.57 as against 6.3 to 10.6 oral 

 diameters in length. It is unlike that species, however, in 

 having an oral brim, and in its greater suboral and aboral 

 flares, as well as in being narrowed posteriorly to a greater 

 extent. It is unlike E. attenuatus in that that species has no 

 pronounced brim or aboral flare; attenuatus is also stouter, 

 being 5.4 to 5.6 oral diameters in length. Eutintinnus latus 

 is much stouter, and so is E. jra\noii. There is no aboral 

 constriction in magnificus as in E. colligatus. 



Recorded from four stations (19, 20, 20-21, 21) in the Sar- 

 gasso Sea. 



There are 5 net samples, of which 1 was taken at the 

 surface, 2 at 50 meters, and 2 at 100 meters. Frequency, 

 minimum. 



Temperature, 22?42-25?3i (23?68); salinity, 36.24-37.15 

 (36.79); density, 24.47-25.67 (25.10); pH, 8.19-8.27 (8.24). 



Type locality, station 19, at 50 meters; latitude 24 00' 

 north, longitude 39 36' west. 



Eutintinnus medius Kofoid and Campbell 



Tintinnus medius Kofoid and Campbell, 1929, p. 336, fig. 629. 



The stout, moderately bulging lorica, with both ends 

 flaring, has a length of 4.35 oral diameters. The oral margin 

 has a narrow, molded brim. The suboral funnel (23 ) has 

 a length of nearly 0.64 oral diameter and a diameter of 0.73 

 oral diameter at the lower end. The shaft is a truncated 

 conical (3 ) section, with submedian (0.53 total length) 

 bulge (0.82 oral diameter). Below the long bulging region, 



