540 LEPADID2E. 



consist of two segments, of which the lower one (as here) 

 is longer than the upper one, and both (as here) con- 

 siderably thicker than the segments of the rami : in all 

 cirripedial pupa?, likewise, the thick pedicels of the limbs 

 consist of two segments, and each ramus, also (as here), of 

 two segments : now, with these coincidences, and bearing 

 in mind that in Alcippe the two upper segments do not 

 arise from the exact middle of the summit of the second 

 segment, but from rather its anterior side, — bearing, also, 

 in mind the case just cited of Alepas cornata with the pos- 

 terior rami of these very same cirri rudimentary, — w 7 e may, 

 I think, safely conclude that here in Alcippe the two lower 

 segments form the pedicel ; the two upper segments, the 

 anterior ramus ; and that the button-like protuberance is 

 the posterior ramus in a modified condition. As the caudal 

 appendages in none of the Lepadidse, either in the mature 

 state or in the pupa, have two rami, we can satisfactorily 

 understand the absence of any trace of the button- like pro- 

 tuberance on the top of the second segment.* 



Alimentary Canal. — The oesophagus runs down from the 

 mouth, beneath and nearly parallel to the straight row of 

 hairs on the two sides of the labrum : it is surrounded by 

 the usual muscles : at the lower end it bends clown, and 

 expanding a little, like a bell, enters the stomach. The 

 stomach is of considerable size and fills the main part of the 

 body, bulging out under the mouth, and prolonged as far as 

 about the middle of that segment (/), which ought to have 

 borne the third pair of cirri ; here the stomach terminates 

 in a blunt rounded point. The tissue surrounding the 

 stomach, and keeping it in its proper place, can be traced 

 to the posterior end of the thorax, but there is no rectum or 

 anus. I am prepared to assert positively that this is the 

 case,t for I made repeated longitudinal sections of the whole 



* I almost wish I could persuade myself that I had takeu an erroneous view 

 of the thoracic segments, and therefore that the three pairs of terminal appen- 

 dages were all abdominal, for then Alcippe would come into much closer 

 relationship with Cryptophialus ; though even in that case it would form a 

 distinct family from it : but I cannot alter my opinion. 



f I may venture to remark that I succeeded in every attempt, which I made, 

 in seeing plainly the oesophagus, and the acoustic and olfactory orifices and sacks, 

 which, according to all analogy, would be of much smaller size, and far more 

 difficult to discover, than the rectum and anus. I may mention that, according 



