TAXONOMY AND DISTRIBUTION 



69 



The wall has a maximum thickness of 0.04 oral diameter 

 in the anterior part of the bowl, and two-thirds as much in 

 the lower bowl. There are exceedingly thin laminae with 

 enclosed hyaline matter. The anterior half of the bowl is 

 free of markings. The free lines are short, anastomosing, 

 thin, subvertical lines, and the reticulations are large, thick- 

 walled areas of subcircular form. Most of the horn is 

 hyaline. 



Length, 93 to 1 1 oil. 



Epiplocylis exquisita has a wider, shorter bowl than E. 

 blanda, thinner walls, shorter free lines, and more sharply 

 differentiated horn than E. undella, much less rotund bowl 

 than E. pacified, and shorter bowl than E. impensa. 



Recorded from four stations, one in the Atlantic and three 

 in the Pacific, as follows: one (25) in the Atlantic equatorial 

 region, two (35, 35-36) in the Pacific equatorial region, and 

 one (100) in the North Pacific trade region. 



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

 surface, 2 at 50 meters, and 1 at 100 meters. Frequency, 39 

 per cent at station 100; 4 to 7 per cent at stations 25, 35-36; 

 average in the Pacific, 21.5 per cent. 



Temperature: Atlantic, i4?6o;Pacific,i6?30-27?67(2i?98). 

 Salinity: Atlantic, 35.70; Pacific, 34.71-34.88 (34.79). Den- 

 sity: Atlantic, 26.62; Pacific, 22.31-25.60 (23.95). pH: At- 

 lantic, 7.93; Pacific, 7.92-8.21 (8.06). 



Epiplocylis impensa Kofoid and Campbell 



Epiplocylis impensa Kofoid and Campbell, 1929, p. 180, fig. 343. 



The fairly tall, tapering, goblet-shaped lorica, with strong 

 angles, low reticulated region, and thick aboral horn, has a 

 length of 1.44 oral diameters. The oral margin is sharp- 

 edged and erect. The bowl is conical (io°) in the upper 

 0.56 oral diameter, the diameter at the lower end being 0.93 

 oral diameter. Below this level it contracts (33 in the 

 upper part increasing to 83 below); the upper part is 0.94 

 oral diameter in length. The lateral contour of the whole 

 is distinctly angled at important levels of change. The aboral 

 horn is conical (23 ), and blunt at the free tip. 



The wall reaches a thickness of a little more than 0.06 

 oral diameter in the suboral region; in the lower bowl it is 

 about half as much, or less. There are thin laminae with 

 enclosed alveoles. The reticulated region occupies about 0.5 

 oral diameter and the free lines extend subvertically for as 

 much as 0.6 oral diameter. The reticulations are moderately 

 pitted and subpentagonal to hexagonal, and on the horn 

 free vertical lines are continued for 0.75 of its length. 



Length, 115 to 126".. 



Epiplocylis impensa has angled instead of convex lateral 

 contour, and a longer horn and much coarser reticulations 

 than E. atlantica, which is otherwise much like it. Epiplocylis 

 lineata, its neighbor, is conical, with a long horn and very 

 long free lines. Epiplocylis blanda is narrower, with a longer 

 free region and finer reticulations. 



Recorded from two stations in the Atlantic, as follows: 

 one (19) in the Sargasso Sea and one (27) in the Atlantic 

 equatorial region. 



There are 3 net samples, 2 of which were taken at 50 



meters and 1 at 100 meters. Frequency, 8 per cent al 

 station 27. 



Temperature, [8?o8-26?04 (23?i4); salinity, 36.03-37.15 

 (36.47); density, 23.98-26.06 (24. hi); pH, 8.09-8.30 (8.22). 



Epiplocylis inconspicuata Kofoid and Campbell 



Epiplocylis inconspicuata Kofoid ami Campbell, 1929, pp. 180- 

 181, fig. 326. 



The short, wide lorica, with conical bowl and narrow free 

 region, has a length of 1.2 oral diameters. The oral margin 

 is sharp-edged. The bowl expands with distinct lateral con- 

 cavity to a diameter of 1.04 oral diameters near 0.18 oral 

 diameter below the rim. The swollen band has a width o! 

 approximately 0.27 oral diameter. The bowl below tins 

 lower level contracts (44 increasing to t 15 ) , being least 

 in the anterior 0.38 oral diameter and thence, with sharp 

 angular change, greater. The aboral horn is narrow conical 

 (26°) and only 0.2 oral diameter in length, and has a 

 sharply pointed free tip. 



The wall is thickest in the swollen region, where it is over 

 0.07 oral diameter; lower down in the bowl it is less than a 

 third as much. There are extraordinarily thin laminae 

 which enclose pallid, minute alveoles. There are no free 

 lines, the upper region being 0.15 oral diameter in width. 

 The reticulations are coarse, subequal, deeply pitted, and 

 squarish to rounded. 



Length, 72(1. 



Epiplocylis inconspicuata differs from E. infiata in having 

 a narrower free region, less suboral thickening, and less 

 width. 



Recorded from two stations (65, 67) in the South Pacific 

 middle latitudes, in 2 net samples taken at 100 meters. 

 Frequency, minimum. 



Temperature, i5?03-i6?36 (15^69); salinity, 34.30-34.70 

 (34.50); density, 25.44-25.45 (25.445); pH, 8.09-8.10 (8.095). 



Epiplocylis infiata Kofoid and Campbell 

 Epiplocylis infiata Kofoid and Campbell, 1929, p. 181, fig. 329. 



The short, distinctly wide lorica, with short free region, 

 has a length of 1.0 oral diameter. The oral margin is thin 

 and sharp. The bowl is subcylindrical in the anterior 0.16 

 oral diameter, then swollen to a diameter of 1.07 oral diam- 

 eters within a band 0.22 oral diameter in width, and grad- 

 ually contracts in the remaining region (50° increasing to 

 105 ), the angle being least in the upper two-thirds of the 

 section. The aboral horn is narrow conical (23 ) and only 

 0.16 oral diameter in length, and has a sharp free tip. 



The wall is thickest in the wide band, where it reaches 

 about 0.09 oral diameter; elsewhere it is reduced to a third as 

 much, or less. There are extremely thin laminae, between 

 which are packed minute alveoles. The surface reticulations 

 are lacking in the subcylindrical section. There are a few 

 scattered, subvertical, short free lines, and the reticulations 

 are large subpentagons or hexagons. 



Length, 77 to 85U. 



