TAXONOMY AND DISTRIBUTION 



"5 



and rapidly thins to a minimum ot:' 0.07 just above the aboral 

 expansion. It is glass-clear, and though laminae are present, 

 the enclosed material is without clear-cut prisms. 



Length, 107 to 133^. 



Marshall (1934) includes this species with Steenstrupiella 

 stetnstrupii because of size, striae, and thickness, but these 

 characters are of less importance than the swollen pyramidal 

 aboral end. The two species were readily distinguishable in 

 the Carnegie material. The figured lorica (fig. 114) is ex- 

 treme, however, in this regard. 



Steenstntpiclhi robtnta differs from S. steemtnipn and S. 

 gnicilis in the shape of the aboral end. 



Recorded from five stations, two in the Atlantic and three 

 in the Pacific, as follows: one (3) in the Atlantic drift, one 

 (21) in the Sargasso Sea, one (48) in the region of South 

 Pacific island fields, one (59) in the South Pacific middle 

 latitudes, and one (145) in the North Pacific middle lati- 

 tudes. 



There are 6 net samples, of which 3 were taken at the 

 surface, i at 50 meters, and 2 at too meters. Frequency, 

 2 per cent at station 3; other records minimum; average in 

 the Atlantic, 1.5 per cent. 



Temperature: Atlantic, i3?52-26?57 (i8?25); Pacific, 

 i6?33-23?63 (i9?98). Salinity: Atlantic, 35.85-36.28 (36.03); 

 Pacific, 34.71-36.44 (35.37). Density: Atlantic, 23.84-26.96 

 (25.87); Pacific, 24.86-24.90 (24.88). pH: Atlantic, 8.10- 

 8.31 (8.23); Pacific, 8.10-8.32 (8.20). 



Steenstrupiella steenstrupii (Claparede and Lachmann) 

 Kofoid and Campbell 



Steenstrupiella steenstrupii, Kofoid and Campbell, 1929, p. 314, 

 fig. 596; Marshall (part), 1934, pp. 655-656 (see also S. 

 robusta) . 



Steenstrupiella entzi Kofoid and Campbell, 1929, pp. 312-313, 

 fig- 593- 



The moderately elongated lorica, with very low, flaring 

 collar, long, tubular bowl, and saccular aboral end, has a 

 length of 4.5 oral diameters. The oral margin is thin. The 

 widely flaring collar is a basal segment of a full-sided in- 

 verted cone (60°), with a length of nearly 0.4 oral diameter 

 and with a diameter of 0.75 oral diameter at the lower end. 

 The elongated tubular section of the bowl has a length of 

 0.89 total length, and it maintains approximately the same 

 diameter as at the throat throughout. The aboral end is 

 rounded ofl, saccular, without a point, and a little expanded. 

 Above the rounded part extend 6 very short (hardly 0.75 

 oral diameter) ridges or fins, on the lower end of the tubular 

 bowl. 



The hyaline wall is thickened at the throat to nearly 0.16 

 oral diameter, but is less than half as much at other levels. 

 There are 2 round macronuclei. 

 Length, 117 to 200[X. 



This extensively distributed species is remarkably variable 

 in its length, in possible correlation with temperature. 



The inclusion of Steenstrupiella entzi with the present 

 species must, of course, be only tentative, but does not seem 

 impossible. Steenstrupiella entzi is comparable with those 



loricae of Tintinnopsis, such as Tintinnopsis dadayi, in 

 which repeated collars occur at fission. 



Steenstrupiella steenstrupii is much like S. robusta, but 

 lacks the aboral expansion. Its low fins are relatively 

 shorter, and its collar is more flaring. It is not so long as 

 5. ititumescens, and is never swollen in the middle as is that 

 species. 



Recorded from thirteen stations, six in the Atlantic and 

 seven in the Pacific, as follows: one {3) in the Atlantic drift, 

 four (17, 18, 19, 20) in the Sargasso Sea, one (33) in the 

 Caribbean Sea, one (35-36) in the Pacific equatorial region, 

 one (45) in the Galapagos region, one (62) in the South 

 Pacific middle latitudes, one (96) in the region of South 

 Pacific island fields, one (148) in the California region, and 

 two (150, 151) in the North Pacific trade region. 



There are 6 pump and 12 net samples, of which 5 were 

 taken at the surface, 6 at 50 meters, and 7 at 100 meters. 

 Maximum frequency, ii per cent at station 3; 8 per cent at 

 station 35-36; average in net samples, 5 per cent in the 

 Atlantic and 3.3 per cent in the Pacific. 



Temperature: Atlantic, net samples i4?66-25?3i (21:13); 

 Pacific, pump samples i2?44-28?4i (22^05), net samples 

 i8?28-2i?69 (i9?98). Salinity: Atlantic, net samples 35.96- 

 37.15 (36.58); Pacific, pump samples 34.02-35.63 (34.71), 

 net samples 34.42-35.21 (34.81). Density: Atlantic, net 

 samples 24.89-26.81 (25.68); Pacific, pump samples 22.34- 

 26.22 (23.89), net samples 24.89-26.81 (25.68). pH: At- 

 lantic, net samples 8.15-8.27 (8.20); Pacific, pump samples 

 8.10-8.39 (8.22), net sample 8.12. 



DADAYIELLA Kofoid and Campbell 



Dadayiella Kofoid and Campbell, 1929, p. 319. 



Dadayiella is a specialized tropical genus with a few 

 species that occur in the Mediterranean. 

 Four species are described here. 



Dadayiella acutiformis Kofoid and Campbell 



Dadayiella acuta, Kofoid and Campbell, 1929, p. 320, fig. 609. 

 Dadayiella acutiformis Kofoid and Campbell, 1939, pp. 341- 

 342, pi. 29, fig. 4. 



The tall, chalice-shaped lorica, with fairly long aboral 

 horn, has a length of 3.45 oral diameters. The oral margin 

 is exceedingly thin and its sides are bounded by 9 plane 

 facets. The 9 facets extend for nearly 0.5 oral diameter 

 below the rim. The narrow, bell-shaped bowl flares (50°) 

 as a basal segment of a cone with a length of only 0.2 oral 

 diameter, forming a collar-like region. Below this collar the 

 bowl is a long segment of an inverted cone (6°) with a 

 length of nearly 1.46 oral diameters, and aborally it becomes 

 one of 30° with a length of 1.19 oral diameters, the trun- 

 cated end of which segment has a diameter of o.ii oral 

 diameter. The conical (5°) aboral horn has a length of 

 0.29 total length and has a minutely blunted tip. 



The wall is exceedingly thin and clear, and the cavity, 

 which exactly follows the outer contour, continues to the 

 aboral tip. 



Length, 75J.I. 



