456 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Habits of Hermit Crabs.*— Anna Drzewina has studied Clibanarius 

 misanthropus, and finds that those at Banyuls-sur-Mer (Mediterranean) 

 show a constant positive phototropism, while those at Arcachon (Atlantic) 

 show a phototropism which changes periodically from positive to nega- 

 tive and back again. There seems to be some connection between this 

 difference of reaction and the absence and presence of tides. It is 

 shown that various factors — chemical, physical, and mechanical — may 

 affect the "sign" of the phototropism. It is also possible to create 

 experimentally in the hermit-crabs new psychical associations, for they 

 learn to distinguish shells of different forms. 



Paramola cuvieri in Scottish Waters.f — James Ritchie records the 

 capture of a good specimen of this rare crab from between the Flannan 

 Islands and the Butt of Lewis. This widens considerably the northern 

 boundary of the tract within which this distinctly southern form is 

 known to live. 



Decapoda from North Side of Bay of Biscay 4 — Stanley Kemp 

 reports on a collection of forty-nine species made by the ' Huxley.' The 

 majority are well-known members of the north-east Atlantic fauna. 

 Five species not hitherto known to extend south of the British Isles 

 are recorded. A fragment, which has been tentatively referred to 

 Periclimenes korni (Lo Bianco) is of much interest, for no deep-water 

 representative of the family Pala3inonida3 was hitherto known from the 

 north-east Atlantic. 



Upogebia stellata and Gebia deltura.§ — W. de Morgan discusses 

 the question whether these are distinct species, or merely sexual forms 

 of one species. He has examined a good many examples of both forms, 

 which occur together at Salcombe, and concludes that they are quite 

 distinct. 



Japanese Stomatopods.|| — T. Fukuda reports on a collection of 

 fourteen species, of which two are new — Gonodactylus sjrinosocarinatus 

 and Lysiosquilla crassispinosa. 



Revision of Monolistrini.^T — E. G. Racovitza continues his study of 

 cavernicolous animals, discussing those which belong to the Isopod sub- 

 family Sphaeromime. He gives a careful revision of the Monolistrini — 

 Monolistra Gerstaecker, Csecosphseroma Dollfus, and various sub-genera. 



Alimentary Tract of Lynceus.** — J. Tollinger describes the remark- 

 able type of alimentary canal that occurs in Lynceids, e.g. Lynceus in- 

 termedins. The fore-gut is very short, so is the hind-gut. The 

 mesenteron is long and coiled, and gives off a ventral, worm-like caecum 

 extending forwards. Full details are given of the minute structure of all 

 the parts. 



* Arch. Zool. Kxper., v. (1910) Notes ot Revue, No. 2, pp. xliii-lv (2 figs,), 

 t Ann. Scot. Nat. Hist. (Jan. 1910) pp. 12-14 (1 fig.), 

 t Journ. Marine Biol. Assoc, viii. (1910) pp. 407-20. 

 § Tom. cit., pp. 475-7 (2 figs.) 

 || Annot. Zool. Japon, vii. (1910) pp. 139-52 (1 pi.). 

 1 Arch. Zool. Exp6r., iv. (1910) pp. 625-758 (14 pis.). 

 Ann. Biol. Lacustre, iii. (1909) pp. 271-99 (2 pis.). 



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