REPOKT ON THK PKNNATCJLIDA. 



249 



brought forward in the case of Pennatula ; i.e., we have found foreign 

 bodies, such as diatoms (Fig. 7. /o), imbedded in the filaments, and 

 clearly undergoing digestion. As these bodies become completely en- 

 veloped in and by the filaments, it is clear that these latter must have 

 the power of changing their shape and spreading round any body that 

 may come in contact with them, a power that is probably due to 

 amoeboid movements of the individual cells of the filaments. 



We described in Pennatula the presence of an Entomostracon, 

 apparently a parasitic Copepod in the body-cavity of one of the 

 polypes ; and we noticed also that ripe ova had been discharged from 

 the Entomostracon and were lying in various parts of the polype, some 

 freely and some imbedded in the mesenterial filaments ; also, that 

 many of these ova had commenced to develop. 



We have found ova precisely similar to these present in large 

 numbers in the polypes of Virfjularia (Fig. 7, ov), and although we 

 have not found the Entomostracon itself, we have no doubt, from the 

 identical character of the eggs in the two cases, that those found in 

 Virgularia belong to the same animal as those found in Pennatula, or to 

 some very closely allied one. 



We have also found, what we were not aware of when writing our 

 account of P,'nnatula, that Eutomostraca very closely similar to this 

 one have already been found in corresponding situations in allied 

 animals. 



In 1859 Bruzelius* described under the name of Lamippe rubra a 

 parasitic crustacean which he found inhabiting specimens of Pennatula 

 ruhra taken off the west coast of Sweden. Not long afterwards 

 Claparedef found at Naples an allied form, which he called Lamippe 

 proteua, dwelling parasitically in specimens of Lohularia ( Alcyoninm) 

 digitata, and wrote a careful account with figures of both the male and 

 female. 



Quite recently M. JolietJ has described and figured a third species 

 of this genus olotained from Paralc]ioniuni elegana, and which he names 

 Lamippe Dutliierttii. He notices, like Clapar^de, that the sexes are 

 distinct, and lays stress on the remarkable changes of shape which the 

 body undergoes, and which led Clapar^de to name his species L. proteus. 

 When at rest the animal is a somewhat cylindrical sac, about 0-04 

 inch in length, with two pairs of jointed antennae at its anterior end in 

 front of the mouth ; two small pairs of legs a short way behind the 

 mouth ; a caudal-fork armed with setae ; and a straight alimentary 

 canal with a distinct anus. 



The Entomostracon we found, as described, in Pennatula clearly 

 belongs to the same genus. Unfortunately we have as yet come 

 across only a single specimen, and as that one is in a series of transverse 



* Bruzolius: " Ueber eineu iu der Pe?i?ia4uirt ?•«?;?•« lebeudeu Scbmarotzer " 

 (Archiv. f. Naturgesch, 1839, bd. i., p. 28G.) 



t Claparedo : "MiscollanSes ZooloRiques," "Annalesdes Science Naturclles," 

 " Cinquieine Serio," tome viii., 18G7, p. 'A'S seq. 



t riucieii .Toliet : " Olisurvatioiis snr quelques Cnistaccs dela Mediterrance," 

 " Archives de Zoologie oxperiineutale ' tome x., 1882, p. 101 aeq. 



