THE OSTHACOUA. 



265 



Table G. — Total specimens measured : 37 + ? 3 ? , 5 cJ =42 + ?3. 



In the females the usual proportions between the means appear, the second place of 

 decimals being somewhat vague, presumably owing to the paucity of specimens. Thus, 

 0-62 X 1-64 = 1-01 ; I'Ol X I'Gl. = 1-65G ; 1-66 X 164 = 2-72. The observed mean of 

 0'66 for Stage IV. is perhaps too high, and the growth-factor employed a little larger 

 than the true factor. 



In the males. Stage II. with a mean length probably somewhere about 1'45, was not 

 represented in the collections. 



CONCHCECIA HYALOPUYLLUM, ClaUS. 



Four stages were observed ; of these only the second, or lower se.Kual stage, has 

 hitherto been recognised, except by Juday, who gives a length for females of 2'4 mm. 

 Avithout further comment. The tirst stage was apparently described by Midler under 

 the specific name loj)hura. 



The actual measurements were as follows : — 



Tablk H. — Total specimens measured: 62 + ? 1 ? ; 43 (? = 105. 



