ZOOGEOGRAPHY 



259 



Lagisca hubrechti 



(Text-fig. 51, Table 33) 



L. hubrechti was found in thirteen samples from six stations in the Sub-Tropical Zone and in one 



sample in the Antarctic Zone. This species varies in length between 5-22 mm. and could have been 



caught by most nets. 



At St. 100, L. hubrechti was collected in South Atlantic Central Water, Antarctic Intermediate 

 Water and also in the Warm Deep Layer, and it occurs more frequently in the deeper waters at the 

 other stations made in the Sub-Tropical Zone. The single record of L. hubrechti from the Antarctic 

 Zone cannot be considered an anomaly because our knowledge of the pelagic Polynoinae is limited to 

 comparatively few records of several species which may represent pelagic phases of bottom living 

 forms and it is possible that L. hubrechti is one of these. More information on the life cycle of this 

 species is necessary before its distribution can be analysed. 



Previous records. Monro (1930) reported L. hubrechti from 'Discovery' collections in the Antarctic 

 Zone (St. 169, as above) and in the Sub-Tropical Zone. 



Lopadorhynchus uncinatus, Lopadorhynchus krohnii 

 and Lopadorhynchus brevis 



(Text-fig. 52, Table 34) 



L. uncinatus and L. krohnii were collected at numerous stations north of the Sub-Tropical Conver- 

 gence and it is evident that they are limited in their southerly distribution by this barrier; L. brevis 

 was collected at only four stations, all north of the Sub-Tropical Convergence and it is possible that 

 this species also is limited by this barrier, but the records are too few to warrant drawing firm con- 

 clusions about its distribution. L. uncinatus measures between 13-24 mm. in length, L. krohnii 

 between 5-10-5 mm. and L. brevis 7-20 mm.; normally all three could be caught by the N 70 nets 

 and L. uncinatus and L. brevis could also be collected by the N 100 and TYF. 



In the Sub-Tropical Zone L. uncinatus was collected in either the South Atlantic Central Water or 

 Antarctic Intermediate Water at Sts. 714, 672, 673, 674, 1604, 2083 and 1606; in Antarctic Inter- 

 mediate Water at Sts. 2082 and 2630; and in this layer or in the Warm Deep Water at St. 2629. In 

 the Tropical Zone the net which caught it at St. 697, fished in both Tropical Surface Water and South 

 Atlantic Central Water. 



L. krohnii was collected in the Sub-Tropical Zone in South Atlantic Central Water at Sts. 104, 

 257, 268, 2034, 1604 and 2081 and in Warm Deep Water at Sts. 100 (2500-2000 m.). At St. 100 

 (475-0 m.) it was caught in either South Atlantic Central Water or Antarctic Intermediate Water. 

 In the Tropical Zone L. krohnii was collected in Tropical Surface Water or South Atlantic Central 



13-2 



