CRYPTOPHIALUS MINUTUS. 585 



perfect pupae, or fully developed pupae : we may, conse- 

 quently, conclude that these young males were maturing 

 in order to impregnate the next set of eggs. 



The male, immediately after its metamorphosis from its 

 pupal condition, which has been fully described, is almost 

 globular, but slightly bilobed, and is formed of strong, 

 structureless, transparent membrane, including a mass of 

 cellular matter, apparently without any included organs : 

 it is attached by about the middle, between the anterior and 

 posterior lobes, by the not-moulted prehensile antennae. 

 When the male is mature, its greatest length, measured 

 from the posterior end, where the orifice is seated, to the 

 anterior and blunter end, is about ^ths of an inch, and 

 therefore rather less than the pupa, which was ^ths in 

 length. Relatively to a full grown female, the male slightly 

 exceeds half the diameter of the toothed orifice leading into 

 her sack, see (z) fig. 1, PL 23. In the mature condition, 

 (fig. 19), one lobe, namely, the upper or posterior, has 

 become more pointed, and is terminated by a minute 

 orifice, g^ths of an inch in diameter. This orifice is formed 

 by a rim of thickened brownish membrane, which, on what 

 was the ventral surface, has a few very minute, but strong, 

 sometimes bifid spines ; — in this one character, the male re- 

 sembling the female. The other and lower (homologically 

 anterior) end or lobe is broader, and contains a mass of 

 cellular matter, which, from its close resemblance in ap- 

 pearance and position to similar matter within the male 

 Alcippe, I have no doubt forms the contents of the testis. 

 In one single specimen, I succeeded in isolating a vesicula 

 seminalis of small size, containing perfectly distinct sperma- 

 tozoa. Across the middle, between the two lobes, close 

 under the outer integument, there is a broad layer of rather 

 strong transverse muscular fasciae. I did not observe any 

 eye, the presence of which I should have expected from 

 analogy. Internally there is no mouth, thorax, cirri, or other 

 organs, excepting the testis and vesicula seminalis just men- 

 tioned, and an immensely elongated probosciformed penis, 

 coiled up and filling the rest of the inside of the sack down to 

 the testis, which latter occupies the whole anterior, and gene- 

 rally lower end of the animal. This penis is plainly articu- 

 lated, and includes fine transversely-striated muscles : no 



