ZOOGEOGRAPHICAL REVIEW 261 



Water at Sts. 702, 2643 and 2641, in Antarctic Intermediate Water or South Atlantic Central Water 

 at St. 1598, and in Warm Deep Water or Antarctic Intermediate Water at St. 2646. 



L. brevis was collected in South Atlantic Central Water at St. 1602 in the Sub-Tropical Zone and 

 at Sts. 273 and 687 in the Tropical Zone. At St. 683 it was collected in either Tropical Surface Water 

 or South Atlantic Central Water. 



Table 34. Occurrence of Lopadorhynchus uncinatus, krohnii and brevis 

 Occurrence of Lopadorhynchus uncinatus 



Previous records. L. uncinatus was reported by Monro (1936) from St. 714 as listed above, and he 

 also records L. krohnii in the same paper from St. 702 as L. krohnii var. simplex. Reibisch (1895) 

 records L. krohnii as L. viguieri from near the Equator, and Friedrich (1950c) notes its presence in the 

 'Meteor' collections; L. brevis was collected by the Deutsche Siidpolar Expedition in the Tropical 

 Zone of the South Atlantic (Ehlers, 1913) and Monro (1930) recorded it from St. 273. 



ZOOGEOGRAPHICAL REVIEW 



It has long been known that the total plankton production is greater in higher latitudes than in the 

 tropics and successive expeditions have established that this is especially true of the South Atlantic 

 (Friedrich, 1950ft; Foxton, 1956). Except off the south-west coast of Africa where the effect of the 

 cold Benguela current is dominant, the total number of plankton organisms in the top 50 m. of water is at 

 least ten times greater in the Antarctic Zone than in the Sub-Tropical and Tropical Zones [Hentschel 

 (1933); Sverdrup, Johnson and Fleming (1946)]. The total plankton collected in summer between 

 1000-0 m. by seven expeditions has been compared by Foxton (1956) who found the ratio of the 



