646 SUMMARY OF CURRENT RESEARCHES RELATING TO 



skin of the host. They were full of minute hexapod larvae, which 

 develop directly into the limbless adults without trace of nymph stages. 

 From the absence of males parthenogenesis is inferred. 



e, Crustacea. 



Dwarf Males and other Sexual Peculiarities in Cirripedia.* — 

 A. Gruvel finds that the dwarf males of the older species of Scalpellum 

 have a more complete structure than in the newer species. On the other 

 hand, as the general somatic organs atrophy, the reproductive organs 

 become more developed, e.g. in the muscular investment of the seminal 

 vesicle, which violently expels the seminal matter. 



In the dwarf male of Scalpellum peronii some abortive ovarian cells 

 were found — residues of an ancestral hermaphroditism. 



Cirripeds are typically hermaphrodite. They may then exhibit 

 autogamy, or they may be directly cross-fertilised by other hermaphro- 

 dites. An indirect cross-fertilisation, by sperms from other forms con- 

 veyed through the water, seems extremely unlikely. 



In Scalpellum the original form was hermaphrodite, and the dwarf 

 males are derived from hermaphrodites which have become fixed to other 

 hermaphrodites. In certain species, instead of being fixed on other 

 hermaphrodites, they occur on individuals which have become wholly 

 female. 



New Victorian Decapods.f— S. W. Fulton and F. E. Grant describe 

 three new species of shrimps belonging to the genus Pontophilus, and 

 a new crab— Cryptodromia wilsoni. They record the occurrence of a 

 fresh-water form (from Lake Colac), apparently identical with Hymeno- 

 soma lacustris, recorded from New Zealand and Norfolk Island. 



New Parasitic Copepod in Intestine of Mussel.* — A. Steuer de- 

 scribes from Mytilus galloprovincialis Lam. a remarkable new Copepod, 

 which he calls Mytilicola intestinalis g. et sp. n. The parasite is very 

 common in the mussels of the Bay of Trieste, occurring in almost every 

 specimen, and sometimes about half a hundred in one. It is of a reddish 

 colour, worm-like in appearance, the male measuring 4 mm., the female 

 about twice as much in length. The thoracic segments have paired 

 dorsal processes ; the segmentation of the abdomen is imperfect. There 

 is a median eye. 



Steuer gives a short description of the four-jointed first antenna?, the 

 three-jointed hooked second antennas, the short knob-like mandibles, 

 the first maxillipede, hooked in the male, reduced to a small chitinous 

 thickening in the female. The position of the second maxillipede is 

 marked (in the male only) by a slight cbitinous thickening. The other 

 appendages are very small. The genital aperture is paired. 



Nauplii with intense positive heliotropism are succeeded by cyclopid 

 stages, which probably enter the mussel. The new form belongs to tbe 

 family Dichelestiidaa. 



New Victorian Amphipods.§— 0. A. Sayce describes the following 

 new species, — Chiltonia subtenuis, Atyloides f on tana, Gamrnarus haasei, 



* P.V. Soc. Sci. Phys. Nat. Bordeaux, 1901. pp. 93-4. 

 t Proc. E. Soc. Victoria, xv. (1902) pp. 59-6S (3 pis.). 

 X Zool. Anzeig., xxv. (1902) pp. 635-6 (2 figs.). 

 § Proc. E. Soc. Victoria, xv. (1902) pp. 47-58 (4 pis.) 



