200 IBLA CUM1NGII, 



Scalpellum, a class of allied facts to be advanced, which 

 in some respects support the view here taken, but in 

 others are so remarkable and so hard to be believed, that 

 I will call attention to the alternative, if the above view 

 be rejected. The ordinary Ibla Cumingii must have a 

 male, for that it is not an hermaphrodite can hardly be 

 questioned, seeing how easy it always is to detect the 

 male organs of generation ; and we must consequently 

 believe in the visits of a locomotive male, though the 

 existence of a locomotive Cirripede is improbable in the 

 highest degree. Again, as the little animal, considered by 

 me to be the male of I. Cumingii, is exclusively a male, 

 (for there were no traces of ova or ovaria, though the 

 spermatozoa were perfect,) we must believe in a loco- 

 motive Cirripede of the opposite sex, though the existence 

 in any class of a female visiting a fixed male is unknown :* 

 in short, we should have hypothetically to make two loco- 

 motive Cirripedes, which, in all probability, would differ 

 as much from their fixed opposite sexes, as does the Cirri- 

 pede, considered by me to be the male of I Cumingii, 

 from the ordinary form. This being the case, I con- 

 clude that the evidence is amply sufficient to prove that 

 the little parasitic Cirripede here described, is the male 

 of Ibla Cumingii. 



If we look for analogies to the facts here given, we 

 shall find them in the Lerneidse already alluded to, but 

 in these the males are not permanently attached to the 

 females, only cling, I believe, to them voluntarily. The 

 extraordinary case of the Hectocotyle, originally described 

 as a worm parasitic on certain Cephalopoda, but now 

 shown by Kolliker to be the male of the species to which 

 it is attached, is perhaps more strictly parallel. So again 

 in the entozoic worm, the Heteroura androphora the 



* It deserves notice, that in the class Crustacea, both in the Lerneidae 

 and in the Cirripedia, the males more closely resemble the larvae, than do the 

 females ; whereas amongst insects, as in the case of the glow-worm in 

 Colcoptera, and of certain nocturnal Lepidoptera, it is the female which 

 retains an embryonic character, being worm-like or caterpillar-like, without 

 wings. But in all these cases, the male is more locomotive than the female. 



