ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 183 



with other forms which are known to occur, some in the Mediterranean, 

 some in the Gulf of Guinea and South Atlantic, one in the Antarctic 

 Ocean, and some from the very centre of the Pacific. At the depth at 

 which they live the temperature conditions are similar, whether under 

 the tropics or under Arctic ice. They are always on the move, and tend 

 to be readily transported. We are beginning to learn more and more 

 how widely diffused large numbers of abyssal genera and species are, but 

 in no group of animals has this fact been more clearly demonstrated than 

 in Canon Norman's notes on these Calanoida. 



Annulata. 



Leucocytes and Similar Cells in Sipunculus nudus.* — F. Ladreyt 

 finds that there are two very distinct types of leucocytes in this worm. 

 There are minute plastids, with very active fine pseudopodia, and central 

 or slightly excentric nucleus (amcebocytes or phagocytes), which have 

 an important role in excretion and phagocytosis ; and there are large 

 elements, including numerous transparent spherules, without pseudo- 

 podia, with a lateral nucleus (vesicular leucocytes or " glycoleucytes ") 

 which are especially devoted to storing nutritive substances, like glycogen. 

 The adult coloured haamatids absorb carmine injected into the ccelom. 

 When the small amoebocytes absorb excretory substances, they transport 

 these to areas suitable for diapedesis, and the waste is got rid of by 

 epidermic exfoliation, or via the nephridia, or with the fasces. A sheath 

 is formed by the same elements around infecting Bacteria and Nematodes. 



Palolo Worm of Samoa.f — W. McM. Woodworth has prepared a 

 summary report on the well-known form, Eunice viridis Gray. We note 

 a few points only. At the end of October (1897) the Samoan reef was 

 "literally alive with Palolo," which were discovered by prising off 

 pieces of the rock with a crowbar. The operation of freeing unbroken 

 specimens of these fragile worms is a delicate one ; three complete 

 worms were obtained, and an excellent figure is given. The total length 

 averages 400 mm., about one-fourth of which is in the anterior atokal 

 part. In two males about 429 and 359 atokal segments were counted, 

 in a female about 250. The greatest diameter of the atokal part is 4 mm., 

 and that of the epitokal region 1-1 J mm. The colour of the male is 

 reddish-brown, that of the female bluish-green. These colours, which 

 are very marked in the epitokal portions, are there due to the colours of 

 the spermatozoa and ova, after the discharge of which the collapsed 

 integument is translucent and colourless. In the atokous parts the 

 female is more greenish than the male, and the colours are there in- 

 tegumentary. Each epitokal segment bears on its ventral surface a pro- 

 minent pigmented spot, the Bauchauge of Ehlers. These " eye-spots " 

 can be traced into the atokal part through about twenty segments, 

 diminishing in size toward the anterior end ; they are lacking on the 

 anal segment, and are usually absent in two to six of the pre-anal 

 segments. 



A similar swarming of marine Annelids, and at corresponding seasons, 

 is known for other islands of the Pacific, though the worms have not 



* Comptes Rendus, exxxvii. (1903) pp. 865-7. 

 f Amer. Nat., xxxvii. (1903) pp. 875-81 (1 fig.). 



