TAXONOMY AND DISTRIBUTION 



III 



and the lower 1.15 oral diameters in diameter, at 0.8 and i.r 

 oral diameters below the rim; the upper bowl itself has a 

 diameter, at the lower end, of 1.16 oral diameters, and de- 

 cidedly concave sides between each of the three divisions. 

 The lower bowl is pan-shaped, with a broadly rounded 

 aboral end. 



The wall has a thickness of nearly 0.2 oral diameter in the 

 upper, but much less than half as much in the lower, bowl. 

 There are thin laminae which enclose gray material. 



Length, nop. 



Undellopsis tricbllaria resembles U. bicollaria except that 

 there are two rings instead of one on the upper bowl. It is 

 not unlike Amplectella collaria save for the suboral ledge. 



Recorded from three stations in the Pacific, as follows: 

 one (145) in the North Pacific middle latitudes, one (146) 

 in the California region, and one (151) in the North Pacific 

 trade region. 



There are 3 net samples, of which 1 was taken at 50 meters 

 and 2 at 100 meters. Frequency, 4 per cent at station 151; 

 all other records 2 per cent; average, 2.6 per cent. 



Temperature, i8?28-20?07 (ia?i7); salinity, 34-35-34-7 1 

 (34.46); density, 24.24-24.77 (24.50); pH, 8.26-8.31 (8.28). 



TINTINNIDAE Claparede and Lachmann emended 



Tintinnidae, Kofoid and Campbell, 1929, p. 302; 1939, pp. 310- 

 312. 



Twenty-two genera are included in this family, namely, 

 Tintinnus, Bursaopsis, Proamphorella, Canthariella, Am- 

 phorella, Steenstrupiella, Amphorellopsis, Odontophorella, 

 Albatrossiella, Dadayiella, Ormosella, Brandtiella, Prosteli- 

 diella, Stelidiella, EutintinnUs, Daturella, Salpingella, Sal- 

 pingelloides, Rhabdosella, Epirhabdosella, Salpingacantha, 

 and Epicranella. Of these twenty-two genera, eleven are 

 present in the material of this expedition, namely, Can- 

 thariella, Amphorella, Steenstrupiella, Dadayiella, Ormosella, 

 Brandtiella, Eutintinnus, Daturella, Salpingella, Epirhabdo- 

 sella, and Salpingacantha. The family is widely spread in 

 most seas and reaches its greatest development in the tropics. 

 A few species enter both northern and antarctic seas, these 

 showing clear relationships to those of warmer areas. The 

 family is the most highly differentiated in the Tintinnoina. 



TiNTiNNiN.vE Kofoid and Campbell 



Amphorellineae Kofoid and Campbell, 1929, p. 303. 

 Tintinninae Kofoid and Campbell, 1939, pp. ^2-^,1^. 



Included in this report are Canthariella, Amphorella, Steen- 

 strupiella, and Dadayiella. 



CANTHARIELLA Kofoid and Campbell 

 Canthariella Kofoid and Campbell, 1929, pp. 305-306. 



Canthariella is one of the primitive species of the Tintin- 

 nidae in form and wall structure. All the species save one 

 are first reported from the Pacific. All are tropical. 



Three species are described here. 



Canthariella brevis Kofoid and Campbell 

 Canthariella /■urn Kofoid and Campbell, 1929, p. 306, fig. 584. 



The tiny, rather slender lorica, with upright collar and 

 sharply angular aboral end, has a length of 2 to 2.2 oral 

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

 The" collar is an inverted truncated tone (42 ) with a length 

 of 0.16 total length, and its diameter at the lower end is 0.8 

 oral diameter. The conical bowl 17 ) contracts within the 

 aboral fifth to form an angular aboral end (56 ). 



The exceedingly thin wall is hyaline. 



Length, 47 to 54U. 



Canthariella brevis differs from C. truncata in the shape 

 of the aboral end, which in the latter species is squarely 

 truncated. Canthariella brevis has a stouter bowl than either 

 C. truncata or C. septinaria. It is shorter than C. pyramidata; 

 its bowl is shorter, its collar relatively longer, and the aboral 

 end is not shaped as in the latter. Had it a suborally thick- 

 ened wall, it might have been confused with Steenstrupiella 

 gracilis. 



Recorded from four stations in the Pacific, as follows: one 

 (35) in the Pacific equatorial region, one (44) in the Gala- 

 pagos region, one (64) in the South Pacific middle latitudes, 

 and one (136) in the California region. 



There are 1 pump and 3 net samples, all taken at 100 

 meters. Frequencies, minimum. 



Temperature: pump sample 14^33, net samples I4?55— 

 i8?87"(i6?44). Salinity: pump sample 34.91, net samples 

 34.54-35.02 (34.86). Density: pump sample 26.06, net 

 samples 25.09-26.11 (25.54). pH: pump sample 7.88, net 

 samples 7.92-8.39 (8.13). 



Canthariella septinaria Kofoid and Campbell 



Canthariella septinaria Kofoid and Campbell, 1929, p. 307, fig. 

 582. 



The minute lorica has wide collar and short, stout, faceted 

 bowl, and its length is 1.72 to 1.79 oral diameters. The thin 

 oral margin is entire, and the conical collar (37°) has a 

 length of nearly 0.3 total length. Its diameter at its lower 

 end is 0.67 oral diameter. The stocky bowl is subcylindrical 

 for about 0.67 of its own length, contracting below that level 

 about 35 , and has a flattened aboral end about 0.25 oral 

 diameter in diameter. 



The thin wall is hyaline. The lower bowl has 8 subequal 

 short facets, and the neck region is barely thickened. 



Length, 50 to 52U. 



Canthariella septinaria differs from the others of the genus 

 in aboral faceting. 



Recorded from three stations, two in the Atlantic and one 

 in the Pacific, as follows: two (24, 30) in the Atlantic equa- 

 torial region and one (45) in the Galapagos region. 



There are 4 net samples, of which 1 was taken at the 

 surface, 1 at 50 meters, and 2 at 100 meters. Frequency, 

 minimum. 



Temperature: Pacific, 22?43; Atlantic, i5?55~27?88 (22^99). 

 Salinity: Pacific, 35.26; Atlantic, 35.61-36.40 (36.03). Den- 

 sity: Pacific, 24.31; Atlantic, 23.20-26.92 (26.34). pH: 

 Pacific, 8.12; Atlantic, 7.96-8.30 (8.18). 



