262 Miscellaneous. 



two Annelida (1. Umbellisyllis fasciata, 2. Paramphinome pulchelld) ; 

 two Anthozoa (1. Mopsea borealis,2. Fungiacyatlms fragilis) ; three 

 Spongia3(l. Trichostemma hemisphcericum, 2. Claclorhiza abyssicola, 

 3. Hyalonema longissimum). Each species is illustrated by numerous 

 beautiful figures of the animals and their details by Mr. George 

 Sars, which are engraved on six closely packed quarto plates. 

 Many of the species described were found and described by Prof. 

 Sars ; and the account of them has been carefully revised by his son. 

 The work will be continued if Mr. Sars can " obtain the necessary 

 assistance." It is to be hoped that the sale of so important and so 

 conscientious a contribution to this branch of zoology will obtain 

 sufficient support to enable it to be completed. 



MISCELLANEOUS. 

 On Noctiluca miliaris, Sur. By M. L. Cienkowski. 



M. Cienkowski has found Noctiluca miliaris in abundance at Odessa, 

 from which place it extends on one side into the Sea of Azov, and on 

 the other as far as Smyrna. 



The only new information on the organization of the adult animal 

 that we find in his memoir is — the description of a papilla upon 

 which is inserted the vibratile filament discovered by Krohn, and 

 some details as to the movements of the protoplasm which take place 

 in the interior of the nucleus. But the portion relating to the repro- 

 duction of this curious organism is of more importance, and contains 

 interesting observations which extend and correct our knowledge on 

 this subject. 



M. Cienkowski confirms the facts of reproduction by division de- 

 scribed by Mr. Brightwell. This division is observed both in en- 

 cysted Noctiluca} and in those which present the normal structure. In 

 the encysted Noctilucce the tentacle appears before the separation of 

 the two individuals is completed ; in the normal Noctilucce, on 

 the contrary, two tentacles may be found at the commencement of 

 the period of constriction. 



Numerous observations on the regeneration of the different parts 

 of the animal, checked by artificial removals of larger or smaller 

 portions of the body, have convinced M. Cienkowski that the forms 

 described by Busch as young Noctilucce produced by an internal gem- 

 mation cannot be so interpreted. They are simply portions of 

 protoplasm in process of reproduction. When an individual has 

 been deprived of a portion of its substance, it is able to complete 

 itself. It would even seem that portions of protoplasm issuing from 

 the body under the action of compression may give birth to new 

 complete individuals. 



The author has followed more completely than before* the mode 



* Cienkowski, " Ueber Schwarmerbildung bei Noctiluca miliaris" Arch. 

 fiir mikr. Anat. vii. (1871) p. 131. 



