272 



DE. G. H. FOWLEE — BISCATAN PLANKTON : 



CoNCHGECiA PTJSiLLA, Muller, var. MAJOR, Miiller. 



The lengths observed were 



Table L. — Total specimens measured : 2 ? +4- (J = 6. 

 It may prove to be the case that var. minor is only Stage II. of var. major. 



CONCHCECIA RHi'NCHENA, Miiller. 



As only one stage with secondary sexual characters in the male was observed (the 

 length of which agreed with Miiller's rhynchena), the presumption is that an older stage 

 exists, possibly to be found in Jccmipta or tyloda, as being the only suitable forms of the 

 mollis group captured during the cruise. My specimens of these were too few ta 

 determine the point. 



Measurement of rhynchena proper gaA-e the following result : — 



K 



Table M. — Total specimens measured: 28 ? +11 (? = 39. 



In the females the reaction to a growth-factor is very close : — 



0-7xr54=l-07; 1-04 (mean) Xl-54=r60 ; r60xr54 = 2-46. 



As there are only three males to represent Stages III. and IV., it is useless to discuss 

 their growth-factor, and the numbers in both sexes are too small for the contour of the 

 curves to have any value. They have therefore not been reproduced. 



The separation between Stages IV. and V. in females is made on morphological, not 

 statistical grounds. 



