CRYPTOPHIALUS MINUTUS. 579 



which apparently retain this form until finally expelled as 

 excrement : certainly the excrement is in pellets, and I have 

 several times seen pellets within the stomach. 



Organs of Generation. — The specimens as yet described 

 are exclusively female, there being certainly no testes or 

 vesiculse seminales. As in every specimen collected (early 

 in January) there were within the sack either nearly ma- 

 ture eggs, or young larvse, it was the worst period for seeing 

 the ovarian caeca, and I have failed to discover them in 

 the specimens now long kept in spirits of wine; but I cannot 

 doubt they would be found, between the inner and outer 

 tunics of the carapace or general covering, near the disc. I 

 have stated in my original notes, made when the specimens 

 were alive, that the ova are at first perfectly detached ; but 

 some appearances make me believe that I overlooked (as 

 might easily happen) the often excessively fine membrane 

 which in other cirripedes unites the ova together, and so forms 

 the ovigerous lamellae. The ova are much less numerous 

 than in other genera, varying from only nineteen to about 

 sixty. In the same individual all the eggs were always in 

 the same state of development. 



Metamorphoses. — The true ova, in their earliest condition, 

 when in the sack, are ovate (PL 24, fig. 1 5), orange-coloured, 

 quite smooth, and barely —th of an inch in their longer axes. 

 They soon become broader at one end than at the other; and 

 by degrees the narrow posterior pointed end becomes de- 

 veloped into a slightly club-shaped, almost transparent 

 (fig. 16) horn, and the broader anterior end, into two rather 

 longer horns. The length of the oval part, not measuring 

 the horns, is nearly the same as in the primary true egg 

 condition. There is as yet no trace of internal organs, the 

 whole contents consisting of pulpy granular matter. How 

 far the above changes are effected by moulting, either of 

 the whole or of part of the integuments of the egg-like 

 body, I cannot say ; but the pulpy matter within the ovum, 

 even in its earliest stage, was included within an inner en- 

 velope or case. 



In the next distinct stage (there being, however, slighter 

 intermediate changes) the posterior horn has shrunk, and 

 become converted into a bluntly-pointed conical termina- 



