HERMAPHKODITISM SUPPLEMENTAL MALE. 



457 



corium, and, running along amidst the underlying muscles and inoscu- 

 lating fibrous tissue, is attached to them by cement at the extremity. 



(1179.) Within the muscular layer all round the upper part of the 

 peduncle, and surrounding the stomach, the body of this minute crea- 

 ture contains numerous little, rather irregular, globular balls with 

 brown granular centres, so closely resembling the testes in other Cirri- 

 pedes as to leave little doubt that they are of the same nature. The 

 vasa deferentia are plainly visible, occupying their normal situation ; and 

 the presence of spermatozoa is indisputable. The vasa deferentia unite 

 and terminate under the two extremely minute caudal appendages : but 

 there is no projecting proboscidiform penis ; and in this case apparently 

 the whole body, furnished like the penis with longitudinal and trans- 

 verse muscles, serves the same purpose ! 



(1180.) Another species belonging to the same genus, Ilia quadri- 

 valvis, furnishes an example of a hermaphrodite Cirriped, which might 

 be supposed to be in itself sufficient for reproduction, provided with a 

 complemental male, an arrangement still more wonderful than that just 

 described as existing in /. Cumingii. In the androgynous individual 

 there is a penis, singularly constructed of several distinct segments, as 

 well as the vasa deferentia and testes, which latter are unusually large 

 and egg-shaped, while the ovigerous system is likewise completely 

 developed ; nevertheless in five out of six specimens dissected by Mr. 

 Darwin males were present, in every respect similar in their structure 

 to those of /. Cumingii described above, and of some of which he was 

 enabled to trace the preparatory meta- 

 morphoses, common to the class, from 

 their larval condition to the adult state. 



(1181.) In this same hermaphrodite 

 specimen of Ibla quadrivalvis, the two 

 ovigerous lamella contained some hun- 

 dreds of larvae in the first stage of 

 development, which were liberated from 

 their enveloping membranes by a touch 

 of a needle; they were about l ft ]j O ths 

 of an inch in length, and presented 

 all the usual characters of Iarva3 at this 

 period. What a truly wonderful assem- 

 blage of beings of the same species, ex- 

 claims the distinguished naturalist to 

 whom we are indebted for these re- 

 searches, did this individual hermaphro- 

 dite present ! We have the numerous, 

 almost globular Iarva3, with lateral 

 horns to their carapaces, with their three pairs of legs, single eye, pro- 

 boscidiform mouth, and long tail: we have the somewhat larger lame, 



Fig. 236. 



Ibla Cumingii, showing the supple- 

 mental male : a, b, c, d, e,f, g, i, body of 

 the female Ibla ; h, supplemental male. 

 (After Darwin.) 



