systematic report 129 



Occurrence : 



St. 89. 28. vi. 26 (day). West of the Cape of Good Hope, iooo(-o) m., 1 $, 7 mm. 



St. 100. 3. x. 26 (day). Off south-west Africa, two hauls: (i) 310-260 m. 1 <$, 7 mm., 5 $$, 7-5-8 mm. (some ovig.), 



4 juv. ; (ii) 250o(-o) m., 4. x. 26 (day), 2 adult $$, larger 9 mm. 

 St. 256. 23. vi. 27 (day). West of Cape of Good Hope, noo-85o(-o) m., 2 juv. $$. 

 St. 258. 25. vi. 27 (night). West of the Cape of Good Hope, 450-320 m., 2 ??, 8-5 mm. 

 St. 267. 23. vii. 27 (night). North-west of Angra Pequena, 55o~45o(-o) m., 2 $<$, 8-8-5 mm., 1 juv. <J. 

 St. 282. 12. viii. 27 (night). West of Cape Lopez, 30o(-o) m., 5 juv., 4-4-5 mm. 

 St. 295. 25. viii. 27 (day). West of Sierra Leone, 2700-250o(-o) m., 1 juv. $. 

 St. 673. 25. iv. 31 (night). West of Tristan da Cunha, 340-0 m., 2 ??, 1 juv. £. 

 St. 695. 11. v. 31 (night). Mid-Atlantic, just north of equator, 370-0 m., 1 juv. $, 5 mm. 

 St. 697. 12. v. 31 (night). Mid-Atlantic, just north of equator, 460-0 m., 1 $,8 mm. 

 St. 702. 17. x. 31 (night). West of Sierra Leone, 236-0 m., 1 juv. <J, 5-5 mm. 

 St. 1568. 11. iv. 25 (night). South-east of Durban, 1400-0 m., 1 juv. 5", 1 juv. $, fragments. 

 St. 1581. 28. iv. 35 (night). East of Zanzibar, 600-0 m., 1 juv. ?. 

 St. 1586. 2. v. 35 (night). North of Madagascar, 550-0 m., 1 juv. $. 

 St. WS 977. 6/7. iii. 50 (night). Nearly 250 miles west of W'alvis Bay, 250-100 m., 2 juv., 2-5-3 mm - (Benguela 



Current Survey). 



Remarks. The species would appear to be by no means a gregarious form for usually only one or 

 two specimens have been found in a haul. The largest number taken in a haul was at station 100 in 

 a closing net fishing between 260-310 m., when ten specimens were caught. 



Distribution. E. tenuis is a mesoplanktonic species with a world-wide distribution in the tropical 

 and sub-tropical waters of the globe. It has been recorded on several occasions from the South 

 Pacific and Indian Oceans and from Atlantic waters, extending eastward from the coast of Florida to 

 the west coast of Ireland in the northern hemisphere, and off the coasts of South Africa in the South 

 Atlantic. It has also been recorded from the Mediterranean on a number of occasions. 



The species has previously usually been taken in vertical hauls, often from considerable depths to 

 the surface, so that it is not possible to say from the earlier records at which depths the animals were 

 actually living. 'Discovery', working with closing nets, took adult breeding females at station 100, 

 at 260-310 m., and station 258, at 320-450 m. The shallowest depth at which it was taken in the present 

 collection was at station 702 in an oblique haul from 236 m. to the surface. The species has only once 

 been recorded actually at the surface, when the type was captured by 'Challenger' in the South 

 Pacific, off the coast of Chili. Although it occurred on a few occasions with E. typica, it appears to tend 

 to occupy somewhat deeper water than that species. 



Euchaetomera zurstrasseni (Illig) 1906 



1906a Mastigophthalmus zurstrasseni Illig, pp. 203-5, % s - 



1913 Euchaetomera pulchra Hansen, p. 15, figs. 



1914 Euchaetomera zurstrasseni, Zimmer, p. 394. 

 1930 Euchaetomera zurstrasseni, Illig, pp. 437-44, figs. 



Occurrence : 



St. 100C. 4. x. 26 (day). West of Table Bay, 2500-2000 m., 1 (J, 7 mm. Almost black. 



St. 120. 22. xi. 26 (day). North-west of Bouvet I., 36o-34o(-o) m., 1 ?, 10 mm. 



St. 254. 21. vi. 27 (night). West of Cape of Good Hope, 20o(-o) m., 2 juv., 4 mm. 



St. 259. 26. vi. 27 (night). West of Cape of Good Hope, 450-370^) m., 1 $, 7 mm. damaged. 



St. 267. 23. vii. 27 (night). West of Orange River estuary, 550-450^) m., 4 juv. ??, 1 juv. <J, 5 mm., 11 very 



small juv. 2-5-4 mm - 

 St. 461 D. 22. x. 30 (night). South-west of Bouvet I., 490-385 m., 1 <J, 6 mm. 



17 D 



