the Growth and Habits of Carausius morosus. 353 



organs. The latter appeared to be functional and showed 

 no sign of degeneration. I made a preparation of the 

 contents of the testes, and found that spermatozoa were 

 present in various stages of development, but the number 

 of mature ones was relatively small. The vesiculae 

 seminales were large and filled with a thick fluid. They 

 contained, however, scarcely any spermatozoa. Judged 

 from these facts the example was not yet fully mature." 

 This specimen had not increased in size for over five 

 months, and, with the small quantity of mature sper- 

 matozoa present, the suggestion of a possible degeneration 

 having taken place occurs to one.* 



Its form and slow growth induced me to separate it from 

 the others, not that I thought it a male, but because it 

 was different from the others. Its noticeable difference 

 consisted in the longer proportion of its legs to its body 

 than is the case with females. 



Egg capsule of C. morosus, with and without lid. 



Form, Size and Weight of Eggs. 



The egg is contained in a capsule, the general shape of 

 which is somewhat similar to a flattened cask, and having 

 consequently an oval cross-section, flat at one pole and 

 semispherical at the other. The flat end is covered by a 

 lid, which consists of a platform with encircling ridge, and 

 in the middle there is a light buff-coloured glossy cap. 

 This cap is only partially perforated in the centre; the 

 apparent hole is closed by a very thin skin, the use of which 

 may be to admit air and moisture by endosmosis, for the 



* " Mr. K. G. Blair exhibited a <J and two $ $ of a stick insect 

 ( ? Lonchodes, sp. ) which is usually parthenogenetic, the <$ being 

 excessively rare, and which he had bred for several generations 

 without any specimen of this sex appearing (Trans. Entom. Soc. 

 London, 1911)." InProc. Zool. Soc. 1915, p. 155, Miss A. C.Jackson 

 mentions that out of about 3000 C. morosus which she reared, 

 seven males were identified. 



