•1")4 SUMMARY OF CURRENT RESEARCHES RELATING TO 



and Nortuu Sound, iu Arctic Alaska, bolougiug to the following 

 geneva: — Paudalus (1), M[isi8 1 1), Acanthozone (Ij, Melila (2), 

 Dullchia (I), and Poijartemia (1). 



New Species of Idotea.* — Mr. C. Chilton describes a new species 

 of Idotea (I. /estiva) found on the under surface of a boulder at low 

 water at Sumner, Canterbury, N.Z. It conies under Miers' section 

 ii. a*, but is distinct from the species there described. 



Copepoda of the Adriaticf — Dr. L. Car has found 23 species of 

 Copepocis in the Adriatic ; he gives the synonymy of the species, 

 and describes three new species, and a young form of Suphirina. 



Copepoda of the North Pacific.t — Dr. S. A. Poppe givesan account 

 of the Copepoda collected by the Drs. Krauso in the North Pacific 

 and in Behring's Strait ; of the four species two are new, and are 

 dedicated to the travellers — Zaus Aurelii, and Scutellidium arthuri. 



Evolution of Sacculina. § — M. Yves Delage has published a 

 lengtliy notice of his researches on this parasite, of which we have 

 already given an extended abstract. || 



Vermes. 



Lymphoid Cells of Annelids.lf — Dr. W. Kiikenthal's observations 

 were nmdc on a species of Tubifex, apparently T. bonneti ; the fol- 

 lowing methods were adopted. The worm was cut into several 

 pieces, and the fluid from the ccelom allowed to pass on to a slide, or 

 treated with a so called physiological fluid, such as ^ per cent, salt 

 solution ; in cither case the temperature was raised to 16-18'. All 

 attempts at staining the living cells failed. The relations of the 

 lymphoid cells to the general organization of the worm were chiefly 

 studied on young living specimens. In making sections, the worms 

 were killed with Flemmiug's mixture of osmic, chromic, and acetic 

 acids, or with 1 per cent, chromic acid ; borax-carmine and alum- 

 carmine gave the best staining results. 



The fluid of the coelom is not homogeneous, but contains a number 

 of elements of various kinds, among which the rather large rounded 

 cells are the most consjncuous ; these are the lymphoid cells, and of 

 them there are two kinds. Some have a more or less finely granular 

 protoplasm, and others contain clear highly refractive granules, wliich 

 are colourless ; others are still larger, and of a yellowish-brown 

 colour. No membrane could be detected in either kind of cell. They 

 exhibit amoeboid movements, and were seen to undergo division, which 

 was direct, and preceded by a direct nuclear division. The author's 

 observation confirms, therefore, the statement of Fleming that leuco- 

 cytes multijily by direct nuclear division. 



* Ann. and Mag. Nat. Hist., xv. (1885) pp. 12.3-4 (3 figs.), 

 t Aicl). f. Natuigescb, 1. (1884) pp. 237-56 (1 pi.). 

 X Tom. cit.. pp. 281-304 (5 pis.). 



§ Arch. Zool. Expe'r. et Gen., ii. (1884) pp. 417-736 (9 pis.). 

 11 See this Journal, iv. (1884) pp. 51-3. 

 i Jenaisch. Zi itschr. f. Naturwiss., xviii. (1885) pp. 819-64 (2 pis.). 



