264 



DR. G. H. POWLEE — BISCAYAN PLANKTON : 



0-66 X 1-32 = 0858 ; 086 x 1-32 = 113 ; 113 X 1*32 =:- 1-49. This is as close as can 

 be expected in so small a species, Avhere tlie unmeasured hundredths of a millimetre are 

 no doubt important. 



It is obvious from the lengths recorded by Miiller (' Valdivia ' specimens, ? 1-1-1-65, 

 d 10-1'7) that Stage I., with a mean somewhere about 1'5 ram., was missing in the 

 Biscayan collections. 

 The actual measurements were as follows : — 



Table F.— Total specimens nicasuml : 326 ? +239 ^ =50.^.. 



It is quite possible that the larvae of less than 0*9 mm. inclvide a few larvae of spM^^/'era, 

 possibly also oi procera. 



Fig. D. 



90 eo 70 eo ot 40 30 zo 10 10 zo 30 40 50 so 70 ao so 



m 



CoNCHCECiA HADDONi, Brady & Norman. 



The specimens available were very few, but at least four stages were recognisable 

 among the females, and two (I. and III.) among the males. The attribution of some 

 of the smallest specimens (0-7 to 0'4 mm.) was naturally not always assured, but the 

 high position of the right asymmetrical gland seemed to indicate this species. 



