354 



Mr. H. Ling Roth's observations m 



chorion itself seems to be too solid and close-grained to 

 admit either. The capsule rounds off immediately below 

 the lid. On one of the flattened edges between the middle 

 and the spherical pole is the mark of the ovary attachment, 

 in the form of a dark narrow ridge completely encircled by 

 another ridge, the whole about 1 mm. long.* Not infre- 

 quently a lid or cap is found at both poles, but the one cap 

 is then generally more or less malformed and the platform 

 hardly discernible. So far none of the eggs with opposing 

 capsules have hatched out, nor is it likely that they will do. 

 Where these opposing processes exist the mark of the 

 ovary attachment is not clear. I have one egg with two 

 caps on one and the same platform. 



The total length of the egg capsules varies generally 

 from 2' 7 to 3*2 mm., 504 specimens measured giving an 

 average length of 2*8 mm. Some capsules are as short as 

 1*2 mm., but are rarely met with, and anything under 

 2*6 mm. does not hatch out. 



The outer surface of the capsule is a dull brown grey, 

 rough to the touch, and under the microscope shows con- 

 volutions somewhat similar to those of a pancreas. This 



Table IV. — Weight of Eggs. 



* The egg is almost identical externally with that of Carausius 

 hilaris, Br., which is, however, smaller and apparently more oval 

 in shape. See Amelie Elkind, " Les Tubes ovariques et l'ovogene 

 chcz Carausius hilaris," Br. Lausanne, 1915, p. 14. 



C. morosus and C. hilaris differ as follows : C. morosus has the 

 anal segment truncate, with only a slight triangular emargina- 

 tion ; C. hilaris has the anal segment produced into two lobes with 

 the apex otbtuse (Brunner and Redtenbacher, Monograph of Phas- 

 mids, R.M.-W.). 



