OXYCEPHALIDAE 295 



for this species with a projecting keel on the anterior margin of the 5th joint, which is in 

 conflict with Bovallius' statements. The present specimens agree with Bovallius' figures. 

 Distribution. Mediterranean; Atlantic, 41 N-29 S; Indo-Pacific. 



Genus Streetsia, Stebb. 



Bovallius, 1890, p. 80 (key to species). 

 Senna, 1902, p. 19 (key to species). 

 Colosi, 1918, p. 218. 

 Stephensen, 1925 a, p. 192. 

 Spandl, 1927, p. 184 (key to species). 



Streetsia challenged, Stebb. 



Stephensen, 1925 a, p. 194, fig. 75, chart 29 (synonymy and growth changes). 

 Barnard, 1930, p. 435. 



Occurrence : 1 . St. 86. South-east Atlantic. 1 $ 29 mm. 



2. St. 87. South-east Atlantic. 1 juv. 9 mm. 



3. St. 250. South Atlantic. 1 $ 25 mm. 



4. St. 254. South-east Atlantic. 1 $ 32 mm. 



5. St. 266. South-east Atlantic. 1 $ with embryos 13 mm. 



6. St. 273. Portuguese West Africa. 1 $ 30 mm. 



7. St. 281. East mid-Atlantic. 1 $ with embryos 38 mm. 



8. St. 285. East mid-Atlantic. 1 $ with embryos 44 mm. 



9. St. 288. East mid- Atlantic. 1 $ 27 mm., 2 ?$ 16 and 22 mm. 

 10. St. 295. East mid- Atlantic. 1^31 mm. 



n. St. 296. East mid-Atlantic. 1 ovig. $ 40 mm. 



Remarks. Stephensen has traced the growth changes in a series of 230 specimens 

 from the Thor expedition. It appears to live at depths of 500-3000 m., but rises to- 

 wards the surface layers at night. Nos. 3-6, 8, 9 and 11 of the present captures are from 

 night hauls in 500-0 m., the others from day hauls in much greater depths. The very 

 small size of the $ with embryos, no. 5, compared with the sizes given by Stephensen, 

 viz. 21-27 mm., and with that of the present nos. 7, 8 and 11, is remarkable. It 

 corresponds with the 12 mm. stage of the ? described by Stephensen, and lacks the 

 "femoral process" on gnathopod 2, the 5th joint of which has no spinous teeth on the 

 front or lower margin (except the apical tooth). The large ?? of nos. 8 and 1 1 constitute 

 records as far as size is concerned. 



Distribution. Mediterranean; Atlantic, 41 N-19 S; Indo-Pacific. 



Streetsia porcellus (Claus). 



Stebbing, 1888, p. 1587, pi. cciii. 

 Stephensen, 1925 a, p. 192, chart 28. 

 Spandl, 1927, p. 188, figs. 20, 21 (intermedia). 

 Barnard, 1930, p. 435. 



Occurrence: St. 290. East mid- Atlantic. 1 ovig. $ 15 mm. 



Remarks. The present $ has no notch on the hinder part of the head, as in the $$ 

 figured by Stebbing and Spandl. 



Distribution. Mediterranean; Atlantic, 37 N-o°; Indo-Pacific. 



