TAXONOMY AND DISTRIBUTION 



107 



(30° increasing to 79°, and finally to 130° in the aboral 

 section). The aboral end is rounded over. 



The wall reaches a thickness of nearly 0.12 oral diameter 

 in the middle of the bowl. The inner collar is diffused. 

 There are thin laminae and enclosed hyaline material. 



Length, 41 to 501^. 



Proplectella perptisdla differs from P. stibacuta in lacking 

 an aboral point, and from P. praelonga in its lesser suboral 

 narrowness; it is also shorter than the latter. Proplectella 

 daparedei is longer, and has a thicker wall in the more de- 

 fined inner collar. Proplectella columbiana has an aboral 

 mammilla, but is otherwise rather similar. 



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

 (38) in the Pacific equatorial region, and one (106) in the 

 North Pacific trade region. 



There are i pump and i net sample, the former taken at 

 100 meters and the latter at the surface. Frequency, 10 per 

 cent at station 38 in the net sample. 



Temperature: pump sample 25?82, net sample 26?48. 

 Salinity: pump sample 35.05, net sample 32.88. Density: 

 pump sample 23.15, net sample 21.31. pH: pump sample 

 8.23, net sample 8.33. 



Proplectella praelonga Kofoid and Campbell 



Proplectella praelonga Kofoid and Campbell, 1929, p. 282, fig. 

 527- 



The moderately tall, stout, bag-shaped lorica has a length 

 of 2.5 oral diameters. The oral margin is sharp. The bowl 

 expands (28°) to 1.67 oral diameters at 0.53 total length 

 below the rim, then contracts (32° anteriorly and 102° 

 aborally). The aboral end is broadly rounded. 



The wall reaches 0.15 oral diameter in thickness near the 

 lower end of the inner collar. The inner collar is diffused, 

 0.21 total length in length, and funnel-shaped (26°), with a 

 diameter at the lower end of 0.8 oral diameter. There are 

 thin laminae and enclosed hyaline material. 



Length, 56 to 761.1. 



Proplectella praelonga is longer than P. tiimida and more 

 prolonged in the upper bowl. Proplectella perpiisilla is less 

 contracted suborally, and, like P. daparedei, has a relatively 

 wider oral opening. 



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

 (80) in the Galapagos region, three (81, 82, 84) in the region 

 of South Pacific island fields, and one (100) in the North 

 Pacific trade region. 



There are 5 net samples, all taken at 50 meters. Frequency, 

 6 per cent at station 81; 2 per cent at station 100; average, 

 2.5 per cent. 



Temperature, 26?o6-27?67 (26'?99); salinity, 34.71-36.42 

 (35.85); density, 22.31-23.75 (23.38); pH, 8.19-8.21 (8.20). 



Proplectella subacuta (Cleve) emended Kofoid and Campbell 



Proplectella subacuta, Kofoid and Campbell, 1929, p. 282, fig. 

 543- 



The small lorica is amphora-shaped and has a length of 

 2.36 oral diameters. The oral margin is sharp. The gen- 

 erally ovate bowl expands (38°) to a maximum diameter of 



1.57 oral diameters at approximately 0.46 total length, then 

 contracts (14° increasing to 68°, finally 119°). The aboral 

 end is broadly rounded. 



The wall reaches 0.21 oral diameter in thickness across the 

 inner collar, and thins down gradually to the aboral end. 

 The inner collar is funnel-shaped (43°), 0.43 oral diameter 

 in length, and 0.93 oral diameter at its lower end. The 

 laminae are thin and enclose hyaline material. 



Length, 501,1. 



Proplectella subacuta is shorter than P. daparedei, and has 

 a narrower oral opening and is more pointed than P. per- 

 pusilla. 



Recorded from eight stations, five in the Atlantic and 

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

 one (18) in the Sargasso Sea, two (23, 25) in the Atlantic 

 equatorial region, one (32) in the Caribbean Sea, and three 

 (69, 71, 74) in the Galapagos region. 



There are 9 net samples, of which 2 were taken at the 

 surface, i at 50 meters, and 6 at 100 meters. Maximum fre- 

 quency, 22 per cent at station 69; other records above mini- 

 mum (2 to 14 per cent) from stations 14, 32, 74; averages in 

 net samples, 2.5 and 13.3 per cent in the Atlantic and Pacific, 

 respectively. 



Temperature: Atlantic, i4?6o-23?30 (i8?5i); Pacific, 

 i4?77-23?46 (i8?97). Salinity: Adantic, 35.59-36.82 (36.10); 

 Pacific, 34.83-35.24 (35.11). Density: Adantic, 24.91-26.66 

 (25.94); Pacific, 24.00-25.91 (25.08). pH: Atlantic, 7.93- 

 8.24 (8.11); Pacific, 7.86-8.13 (8.00). 



Proplectella subcaudata (Jorgensen) Kofoid and Campbell 

 (Figure 99) 



Proplectella subcaudata, Kofoid and Campbell, 1929, p. 283, 

 fig- 539- 



The small, vaselike lorica, with thin wall and decidedly 

 conical aboral end, has a length of 1.92 oral diameters. The 

 oral rim is rounded and thin. The bowl rounds over to a 

 maximum diameter of 1.25 oral diameters at 0.3 total length 

 below the rim. The middle region tapers (16°), and the 

 aboral section is conical (95°). The aboral end is a blunted 

 cone (44°) the length of which is only 0.25 oral diameter. 



The wall reaches nearly 0.09 oral diameter in thickness in 

 the inner collar, the length of which is 0.25 oral diameter; 

 the wall thins down to a membrane in the aboral cone. 

 There are thin laminae and hyaline enclosed material. 



Length, 60 to 941.1. 



Proplectella subcaudata is much like P. parva, but differs 

 in being wider, longer, and more bluntly conical aborally, 

 and in its thinner wall. It is narrowed down suborally, and 

 has a more definite aboral cone than P. cuspidata, besides 

 being shorter. 



Recorded from eleven stations, six in the Atlantic and five 

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

 (14) in the Gulf Stream, one (20) in the Sargasso Sea, three 

 (23, 25, 27) in the Atlantic equatorial region, one (42) in 

 the Galapagos region, three (63, 64, 65) in the South Pacific 

 middle latitudes, and one (109) in the North Pacific trade 

 region. 



