432 SUMMARY OF CURRENT RESEARCHES RELATING TO 



cases originally appendages of the limb, and pass from being podo- 

 branchs to become arthrobranchs and pleurobranchs. 



Relict Crustaceans in North German Lakes. * — M. Samter and 

 W. Weltner have studied the distribution of Mysis relicta, Pallasiella 

 quadrispinosa, and Pontoporeia affinis, and furnish a list of numerous 

 North German lakes in which the " relicts " are at home. They are 

 now distributed over a wide area of the northern plain, which was land 

 and not sea during the Glacial Period. Loven's interpretation that 

 these relicts in South Swedish lakes are referable to an ancient extension 

 of the sea will not serve for North Germany. 



Observations on Young Stages of Balanus improvisus.f — E. 

 Filatowa notes, in the first place, that the nauplii and later stages of 

 this acorn-shell swim about without indications of heliotropism, but 

 they seek shady nooks to rest in. 



Secondly, the author maintains on the basis of experiments with 

 pigments, that the large cells, with large nuclei and granular cytoplasm, 

 on the dorsal wall of the stomach of the nauplius and metanauplius, 

 have an excretory function. Other excretory structures are unknown. 



Thirdly, he gives his reasons for believing that the larval nervous 

 system is simply represented in the nauplius by the ectodermic cells. 

 After noticing what he calls "acid cells," the author briefly describes 

 a pair of glandular organs in the basal segments of the second pair of 

 antennae. 



Decapods of Celebes.J — E - Schenkel reports on the collection made 

 by the brothers Sarasin, which included fourteen new species mostly be- 

 longing to the genera Potamon, Sesarma, Palsemon, and Caridina, so 

 characteristic of the Indo-Pacific fresh waters. The author briefly alludes 

 to some of the zoogeographical riddles which the new facts seem rather 

 to accent than to solve. 



New Genus of Blind Isopods.§— O. A. Sayce describes Eypimetopus 

 intrusor g. et sp. n., a new blind Isopod belonging to the interesting and 

 peculiarly Australian family Phreatoicidae. The new form was found 

 in Tasmania in the burrows of the land crayfish, Engseus cunicularim. 

 In all fundamental characters it agrees with the genus Phreatoicus, 

 but is a quite distinct representative of the very ancient family of 

 Phreatoicidae. 



New and little-known Victorian Decapods. |] — S. W. Fulton and 

 F. E. Grant describe — Platydromia thomsoni g. et sp. n., a new crab of 

 tbe family Dromiidae, and two little-known species — Axius plectro- 

 rhynchus Strahl, and Upogebia simsoni Thomson. They also record the 

 occurrence at Port Philip of the common European shore-crab, Carcinus 

 msenas, — probably introduced in the shipping. 



Reproduction of Limnetic Crustacea.^ — V. Haecker has studied in 

 the Titi lake near Stuttgart the reproductive phases of Heterocope 

 saliens, Diajjtomus denticornis, D. laciniatus, and Cyclops strenuus. 



* Zool. Anzeig., xxv. (1902) pp. 222-4. + Tom. cit., pp. 379-S5 (6 figs.). 



t Verh. Nat. Ges. Pasel, xiii. (1902) pp. 485-585 (7 pis.). 



§ Proc. R. Soc. Victoria, xiv. (1902) pp. 218-24 (2 pis.). 



|| Tom. cit., pp. 55-64 (1 pi.). 



i Ber. Nat. Ges. Freiburg, xii. (1902) pp. 1-33 (C figs.). 



