ALCIPPE LAMPAS. 555 



and so to Lithotrya. Moreover, it is very distinctly related 

 to Cryptophialus in the succeeding Order. 



Male. PI. 23. 



On every specimen of the female Alcippe, which I care- 

 fully examined, I found some minute parasites (or epizoons) 

 attached to the lateral edges of the upper part of the horny 

 disc, and therefore lying within the narrow end of the fis- 

 sure leading into the chamber excavated in the shell of the 

 Buccinum. Although having had some experience in the 

 very anomalous forms which male cirripedes assume, yet 

 when I first casually inspected these parasites under a weak 

 lens, from their transparency, their elongated and lobed 

 body, including an internal folded up organ, I actually threw 

 them away, thinking that they were probably Bryozoa. 

 Subsequently, a more careful inspection immediately showed 

 the cemented prehensile antennae, and their cirripedial 

 nature was demonstrated. I soon found specimens with 

 the perfect still adherent exuviae of the locomotive pupa, 

 undistinguishable from the pupa already described as pro- 

 bably belonging to the female Alcippe. But as this latter fact, 

 may perhaps be doubted, I must show that there is other evi- 

 dence sufficient to prove that these cirripedial parasites are 

 the males of the female Alcippe. Of the females, I inspected 

 many specimens, and all certainly were without external 

 male organs ; and in the four or five specimens which I 

 rigidly examined, there were no testes or vesiculae semi- 

 nales, the latter being in all hermaphrodite and male cirri- 

 pedes so conspicuous. On the other hand, I examined at 

 least thirty specimens of the parasite, and they were all 

 exclusively males, for all had a probosciformed penis, and 

 the greater number had their vesiculae seminales filled with 

 spermatozoa, and hence were ready to perform the act of im- 

 pregnation, but undoubtedly they contained no ova. It would, 

 then, be very strange, if these two cirripedes of opposite sexes, 

 thus attached together, were not sexually related. Wonder- 

 fully different as the parasite is from the female Alcippe, yet, 

 in one very important character it is related to Alcippe, and to 



