528 REPORT ON ZOOLOGY, MDCCCXL1V. 



phorse, Agalmse, Apolemiee. VI. PHYSALI.E, with the three 

 tribes : Cystisomse, Salacise, and Alophotae. VII. VELELL.E. 

 VIII. PoupiTjE. Respecting the geographical distribution 

 of the Acalephse, Forbes (Report of the British Association, 

 1843, p. 146) states, that of the fifty-seven Mediterranean 

 species of Medusae, only a few occur in the Egean Sea, 

 their number diminishing from Gibraltar eastwards in the 

 Mediterranean. Of Pulmograda, Forbes noticed eight 

 species in the Egean Sea, viz. : Rhizostoma Cuvieri (?) Esch., 

 Cephea tuberculata, Macr., Oceania cruciata, Forsk., Thau- 

 mantias laxa, Forb., Aurelia granulata (?) Lam., Geryonia 

 proboscidalis, Forsk., together with a new species, and Meso- 

 nema ccelum pensile, Mod. Of Cirrigrada inhabiting that 

 sea, there are Velella spirans, Forsk., and Porpita glandifera, 

 Lam. ; whilst of Physograda we have Stephanomia contorta (?), 

 M. Edw. ; of Ciliograda, only Beroe Forskalii, M. Edw., 

 Cesium Veneris, Le S., and Cydippe, nov. sp. ; and, lastly, of 

 Diphyda, the two species, Pyramis tetragona, Ott., and Calpe 

 pentagona, Q,. and G. 



Will has given us a very sterling work on the Acalephse 

 of the Adriatic Sea (Horse tergestinse, oder Beschr. u. Anat. 

 der bei Triest beobacht. Acalephen, 1844), to which we are 

 indebted for a multitude of novel expositions with respect 

 to the habits and internal structure of the Medusa?. In the 

 first place, he expresses himself respecting the swimming 

 and the motions of the Ciliograda. The vibratile lamelli- 

 form cilia (Schwingblattchen) are not the only motory organs 

 of the Berot, although they do propel the body with the 

 mouth foremost ; but these cilia are also in motion when the 

 Beroe is at perfect rest, and, on the other hand, the animal 

 has the power of locomotion when the cilia have been re- 

 moved. These organs consequently are merely accessory to 

 locomotion, for this, as Will has satisfied himself, is affected 

 by the alternating contraction of a muscular apparatus con- 

 cealed under the integument. He has completed the diag- 

 nosis of Eucharis multicornis of Escholtz (which, from the 

 perfect specimens of Quoy and Gaimard, was at first described 



