ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 721 



' Sibog-a ' Cirripeds.* — P. P. C. Hoek notes that the ' Siboga ' 

 Expedition in the Malay Archipelago obtained 108 species, of which 68 

 were new, and 50 were from the deep-sea. The ' Challenger ' obtained 

 in all 78 species, of which HO were new, and 56 from the deep-sea. 

 Both collections show that after all only two genera, Scalpellum and 

 Verruca, in deeper water, are represented by many species. The other 

 genera in deep water are represented by few species. For some deep- 

 sea species of Scalpellum it has been shown that they produce a few 

 relatively large eggs, and have an abbreviated metamorphosis : whereas 

 several genera of Cirripeds. and those of the deep sea in the first place, 

 are spread over the whole surface of the earth ; the species of Cirri- 

 peds. and especially the deep-sea species, have a very local distribution. 

 To a certain extent, it is shown that deep-sea Cirripeds have an archaic 

 character. 



Ascidicolous Copepods.t — E. Brement reports on the Copepods 

 which he found inside Ascidians at Banyuls-sur-Mer. He describes four 

 new species : Bonnierilla arcuata, Botryllophflus brevipes, B. banyulmsis, 

 and Aplostoma banyulmsis. 



Annulata. 



Spermatogenesis in Earthworm.^ — E. Hesse finds some interesting- 

 peculiarities in Lumbricus terrestris and Pheretima rodericensis. The 

 spermatocytes of the first order are not readily distinguished from the 

 first order of spermatogonia. The first reduction-division is followed 

 by a resting stage. At each division part of the cytoplasm is pushed 

 towards the centre of the spermatic follicle, and goes to form the blasto- 

 phore. 



The nucleus of the spermatid passes through a phase of pseudo- 

 metamerisation, and elongates temporarily till it is much longer than 

 the head of the ripe spermatozoon. During the shortening the staining 

 reactions of the chromatin change entirely. The basophil granules 

 disappear ; only an acidophil cylinder is left to form the head. 



The idiozome does not form the acrosome or tip, but occurs at the 

 base of the tail as part of the middle piece, and forms, along with 

 mitochondria, a curious transitory structure described by Hepdolla. 



When the spermatozoa are ripe, the external zone of the blasto- 

 phore becomes very fluid, and allows them to go free. The blastophore 

 breaks up into cytoplasmic spheres, which are devoured by phagocytes. 



New Marine OligochsetJ — Umberto Pierantoni describes Parcmais 

 elongata sp.n. from the Gulf of Naples, and revises the other three 

 species of this interesting genus. The diagnosis of the genus reads : 

 Setae in four groups in each segment uniformly forked and sigmoid ; 

 an intestinal enlargement in the form of a stomach in the 8th segment ; 

 testes in the 9th segment : ovaries in the loth ; spermothecas in the 5th. 



* Proc. Acad. Amsterdam Section of Science, xi. (1908) pp. 110-16. 

 t Arch. Zool. Exper., i. ser. 5, Notes et Revue, No. 3 (1909) pp. lxi.-lxxxix. 

 (14 figs.). % Op. cit., x. (1909) pp. 411-16 (2 pis.). 



§ MT. Zool. Stat. Neapel, xix. (1909) pp. 445-58 (1 pi.). 



