286 bulletin: museum of comparative zoology. 



the continental slope (Stations 10233 and 10261, in 1914, Station 

 10295 in 1915) that it was taken; and Hansen's (1915) numerous 

 records are all either from the oceanic water outside the continental 

 slope, or from the outer part of the shelf. Its abundance at Station 

 10233, and its bathymetric distribution there relative to that of Nema- 

 toscelis is noted above (p. 283). 



Hyperiid Amphipods. — Hyperiid amphipods are chiefly represented 

 in the collections by two species of Euthemisto, E. comprcssa and E. 

 hispinosa. In 1914 these two combined, formed a considerable portion 

 of the volume of the horizontal hauls over the continental shelf as a 

 whole south of Nova Scotia; on the southern and western parts of 

 Georges Bank; and on the shelf south of Marthas Vineyard (p. 245), 

 being especially numerous off Cape Sable (Station 10229), west of 

 Le Have Bank (Station 10232), south of Marthas Vineyard (Station 

 10259) and along the southern half of Georges Bank (Stations 10216- 

 10219); and one or the other, or both, occurred at every one of the 

 Stations. 



While exact numerical results can not be expected from horizontal 

 hauls, it may be of interest to note that about 1000 cc. of large Euthe- 

 misto were taken in a half-hour haul on the surface in a 1 meter-net 

 on Brown's Bank (Station 10228) ; 750 cc. on the surface off Shelburne; 

 and about 1000 cc. of medium sized specimens at 40 meters off Cape 

 Sable (Station 10243) in hauls of the same duration. This abundance 

 is apparently characteristic of these waters, for Euthemisto again 

 formed a considerable part of our catches on the shelf south of Nova 

 Scotia (Stations 10291-10294); on Brown's Bank (Station 10296) 

 and off Marthas Vineyard (Stations 10332, 10333) in the summer of 

 1915. Euthemisto is more or less seasonal in its occurrence in the 

 Gulf, for only occasional specimens were taken in May; and it was 

 not until June 19 (Station 10288) that it appeared in any numbers 

 in the tow. 



Very large adults, with eggs, were taken very generally over the 

 whole area both in 1914 and in 1915. But the chief breeding areas, 

 as indicated by relative abundance, are over the continental slope, 

 (Station 10220, 10261); the central and northwestern parts of Georges 

 Bank (Station 10215, 10216, and 10219); on Brown's Bank (Station 

 10228), and off Shelburne (Station 10231). In fact, young larvae were 

 numerous on the surface, adults, with eggs, in the deep haul, both 

 on Georges Bank in 1914, (Stations 10215 and 10219), and off Shel- 

 burne (Station 10293) in 1915. But there is no apparent correlation 

 between these spawning areas and hydrography, since they cover 



