TAXONOMY AND DISTRIBUTION 



33 



shoulder region; the second row, ot 12 larger, more or less 

 circular ones, is equatorial; and the third row, of 6 large 

 circular ones, is postequatorial. In addition, there are scat- 

 tered smaller ones on the bowl. The interfenestral area is 

 reticulated. Primary alveoles occur in the upper framework 

 and between the reticulations on the bowl. 



Length, 70 to 77J.I. 



Dictyocysta elegatis differs from D. mngna in shortness 

 and in less conical bowl, from D. iriiieqiiii/is in less ovoid 

 bowl, from D. ampla in less shoulder and in bowl shape, and 

 from D. speciosa in size and bowl shape. The bowl is not 

 so pointed as in D. miilleri and it has different proportions 

 from that of D. jufidlandica. The remaining species differ 

 from elegans in having only a single row of windows. 



Recorded from seven stations, two in the Atlantic and five 

 in the Pacific, as follows: one (14) in the Gulf Stream, one 

 (23) in the Atlantic equatorial region, three (u6, 117, 128) 

 in the North Pacific middle latitudes, one (118) in the 

 East Asiatic marginal sea, and one ( 130) in the California 

 region. 



There are 7 pump and 7 net samples, of which i was 

 taken at the surface, 9 at 50 meters, and 4 at 100 meters. 

 Maximum frequency, 5 per cent at station 130; other records 

 above minimum (2 to 4 per cent) from stations 116, 117; 

 average in net samples from the Pacific, 3 per cent. 



Temperature: Atlantic, pump sample 14^95, net sample 

 20?99; Pacific, io?i8-i2?9i (ii?44) and 8?93-i2?9i 

 (io?79), respectively. Salinity: Atlantic, pump sample 35.10, 

 net sample 36.04; Pacific, 33.07-34.22 (33.53) and 33.14-34.22 

 (33.72), respectively. Density: Atlantic, pump sample 26.08, 

 net sample 25.30; Pacific, 25.13-25.89 (25.56) and 25.19- 

 26.41 (25.82), respectively. pH: Atlantic, pump sample 8.18, 

 net sample 8.14; Pacific, 8.00-8.26 (8.13) and 7.98-8.26 

 (8.08), respectively. 



Dictyocysta inaequalis Kofoid and Campbell 



Dictyocysta iiiaeqiialis Kofoid and Campbell, 1929, p. 293. fig. 

 571- 



The rather tall lorica, with elegam-Wkf: fenestration, full 

 ovoid bowl, and rounded aboral end, has a length of 1.6 

 oral diameters. The oral rim is undulating, with 7 flat 

 arches and a thin list. The collar is cylindrical, with lateral 

 concavity, with a length of 0.54 total length, with the least 

 diameter near its middle (0.89 oral diameter), and with 7 

 subpentagonal, subequal windows in the upper row and 9 

 quite irregular ones in the lower row. The bowl swells 

 regularly from the throat, reaches 1.43 oral diameters a little 

 below the neck, and then contracts convexly (93° in the 

 upper three-fifths and 105° in the aboral section). The 

 aboral end is rounded off evenly. 



The wall of the bowl has 2 postequatorial rows of fenestrae, 

 of which the upper row of 12 are large circles, subequal, and 

 the lower row of 6 are unequal, less regular subcircles. A 

 few odd, scattered ones occur. The interfenestral surface is 

 reticulated with many small polygons. The windows of the 

 collar are apparently open, and the rather thick beams and 

 mullions are hyaline. 



Length, 64 to 66u. 



Dictyocysta inaequalis resembles D. ampla closely, but has 

 a less full bowl, less regular lower row of fenestrae, and 

 fainter polygons. Its bowl is more convex than that of D. 

 elegans, and its collar is laterally concave. 



Recorded from one station (23) in the Adantic equatorial 

 region, in a net sample taken at 50 meters. Frequency, mini- 

 mum. 



Temperature, 20^99; salinity, ^6.04; density, 25.30; pH, 

 8.14. 



Dictyocysta lata Kofoid and Campbell 

 Dictyocysta lata Kofoid and Campbell, 1929, p. 293, fig. 562. 



The rather short, squat lorica has tall, rectangular win- 

 dows in the collar, a wide, dishlike bowl, and lepida-Wke 

 fenestration, and its length is 1.18 oral diameters. The oral 

 margin undulates only slightly. The collar is cylindrical, 

 with a length of 0.44 total length, and has 8 tall, rectangular 

 windows. The beams and mullions are relatively thin. The 

 dishlike bowl is shaped much like a deep mush bowl. It 

 lacks shoulders, and contracts, or rather rounds, from the 

 throat to the aboral end, forming virtually a hemisphere. 

 The aboral end is unmodified. 



The wall of the bowl has a single irregular equatorial row 

 of 8 very large, roughly ovoid fenestrae. The remaining 

 surface is faintly reticulated, and the framework of the 

 collar glistens. The collar windows are open. 



Length, 57 to 62^. 



Dictyocysta lata differs from D. reticulata not only in the 

 shape of the bowl, but in the size and irregularity of the 

 fenestrae. It has a shorter, fuller bowl than does D. grandis, 

 and is much shorter. It has only a single row of fenestrae, 

 and a bowl differently shaped from that of D. lepida. The 

 bowl lacks the shoulder and distal contraction of D. mexicana 

 and is less dense than in most species. 



Recorded from one station (27) in the Atlantic equatorial 

 region, in a net sample taken at 100 meters. Frequency, 

 minimum. 



Temperature, i8?o8; salinity, 36.03; density, 26.06; pH, 

 8.0Q. 



Dictyocysta lepida Ehrenberg emended Kofoid and Campbell 



Dictyocysta lepida, Kofoid and Campbell, 1929, p. 294, fig. 558; 

 Alzamora, 1929, p. 11, fig. 25. 



The moderately small lorica, with single row of collar win- 

 dows and generally acorn-shaped bowl with 2 minor and i 

 major rows of fenestrae, has a length of 1.28 oral diameters. 

 The oral margin is only slightly undulating. The collar is 

 cylindrical, with a length of 0.35 total length, and with 6 

 rectangular windows with rounded edges. The beams and 

 mullions are exceptionally heavy. The bowl is relatively 

 squat, acorn-shaped, rounding from the neck to 1.08 oral 

 diameters at 0.47 total length from the rim, then contracting 

 (40° in the upper half, 85° below, and near the aboral end 

 125°). The aboral end is blunted. 



The bowl has a major equatorial row of 8 large, squarish 

 to oval fenestrae, and a double row of minor ones; the upper, 

 minor ones form a row of approximately 24 elongate-oval 



