ANELASMA SQUALICOLA. 179 



from nearly every other member of its Order. As the 

 whole of the peduncle is imbedded, and as the mouth is 

 probosciformed, with the labrum a little curled over the 

 adductor muscle, 1 conclude that this Cirripecle can reach 

 minute animals crawling by on the surface of the shark's 

 body. 



It must be borne in mind that the mouth, as in all 

 Cirripedes, has the power of independent movement, and 

 that the mandibles and maxillae are here beautifully adapted 

 to catch and force down any small living creature into 

 the muscular oesophagus; the rudimentary outer maxillae, 

 moreover, no doubt have the power of scraping, like a lip, 

 anything towards these prehensile organs. It will here- 

 after be seen, that the male of Ibla Cumingii, in which 

 the cirri are quite rudimentary, obtains its food in a 

 somewhat analogous manner, though in this case the 

 whole peduncle moves, and not merely a probosciformed 

 mouth : it deserves attention, that in the male Ibla and 

 in Anelasma, in neither of which the cirri are prehensile, 

 the palpi are rudimentary and useless. I am tempted 

 to believe, that the largely developed olfactory sacks, 

 and perhaps, likewise, acoustic (?) sacks, in Anelasma, 

 replace, by giving notice of the proximity of prey, the loss 

 of tactile cirri. It should be remembered that all Cirripedes 

 subsist on animals which happen to swim or float within 

 reach of the cirri ; but here it is only those which happen 

 to crawl within reach of the probosciformed mouth. It 

 would, however, be rash to assert that the cirri in Anelasma, 

 considering their muscular though feeble structure, may 

 not be of some slight use, when thrown over the prey, 

 in preventing its escape. 



Professor Steenstrup informs me that, from late obser- 

 vations, it appears that this animal always adheres to the 

 shark's body in pairs. I regret extremely that I have not 

 been able to examine a pair : that the individual examined 

 by me was bisexual, I can hardly doubt, though the male 

 organs certainly were feebly developed ; it appears pro- 

 bable, that the individual described by Loven was like- 



