38 lepadidtE. 



body* in order to fasten it to a foreign support. But on 

 no other view can the structure, clearly seen by me both 

 in the mature Cirripede and in the larva, be explained, 

 and I feel no hesitation in advancing it. I may here 

 venture to quote the substance of a remark made by Pro- 

 fessor Owen, when I communicated to him the foregoing 

 facts, namely, that there was a new problem to solve, 

 — new work to perform, — to attach permanently a crus- 

 tacean to a foreign body ; and that hence no one could, 

 a priori, tell by what singular and novel means this would 

 be effected. 



Filamentary Appendages. — These have generally been 

 considered to act as branchiae ; they occur at the bases of 

 the first pair of cirri in Lepas, Alepas, Conchoderma, 

 and in three species of Pollicipes : in Conchoderma there 

 are similar appendages attached to the pedicels of the 

 cirri (PI. IX, fig. 4>,g — k) ; and in the above three species 

 of Pollicipes there is a double row of them on the prosoma : 

 their numbers differ in different species (in some there 

 being none) of the same genus, and even in different indi- 

 viduals of the same species ; they are entirely absent in 

 the majority of the genera. These facts would indicate 

 that they are not of high functional importance ; and they 

 seem so generally occupied by testes (PI. iv, fig. 5), that 

 I suspect their function is quite as much to give room 

 for the development of these glands, as to serve for 

 respiratory purposes. With the exception of the four 

 above-named genera, the mere surface of the body and 

 of the sack must be sufficient for respiration : in Concho- 

 derma aurita the two great expansions of surface, afforded 

 by the folded, tubular, ear-like projection s, aid, as I 

 believe, towards this end. 



* The protrusion of the egg-bearing pouches in Cyclops and its kindred 

 genera, outside the body, offers a feeble analogy with what takes place in 

 Cirripedes. Professor Allman ('Annals of Natural History/ vol. xx, p. 7,) 

 who has attended to the subject, says that the external egg-bearing pouches 

 are " a portion of the membrane of the true ovaries :" if the membrane of 

 these pouches had been specially made adhesive, the analogy would have 

 been closer. 



