ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 47 



to feed on parts of vascular plants. It is very shy and mainly nocturnal. 

 The bnrrows are usually closed during the day. The numerous forward 

 pointing spines on the body and legs make it difficult to hold. 



Colour-reactions in Palaemon.* — A. Frohlich has experimented with 

 Palsemon treiUianus, which is blue or green by day, when the red cliroma- 

 tophores are strongly contracted, and reddish-brown by night, when the 

 red chromatophores expand. 



Blinded animals assume at first the night colour ; after 2-4 weeks 

 they become whitish, and after some moults pure white. 



A normal individual put into a white porcelain vessel becomes milky 

 and translucent ; the chromatophores contract greatly, and there is an 

 unexplained turbidity in the carapace. If the animal is put into a glass 

 vessel and that placed on a mirror it becomes transparent ; the maximum 

 contraction of chromatophores occurs. If the peripheral nerves of a 

 limb are cut as near the centre as possible, the chromatophores expand 

 and the limb becomes dark red with yellow bands. If a specimen is 

 forced to jump it loses its transparency and exhibits a cloudy turbidity 

 in the caudal musculature. 



A blinded specimen of F. rectirostris did not show^ the opaque colora- 

 tion referred to above. After a regeneration of the eyes the normal 

 colour was resumed. 



Exotic Crustacea in Basle Botanic Garden.f — R. Menzel found 

 at the side of the Victoria-Regia tank in the palm-house at Basle speci- 

 mens of Stenocypris malcolmsoni Brady, previously known from Xagpur, 

 Ceylon, Celebes, East Africa, and Australia. Its mode of introduction 

 into the garden at Basle is unknown. No males were found in a hundred 

 specimens. A second form was referred to Cypretta {Cypridopsis) ylobiiJus 

 Sars, which occurred in the open air, and appeared like the foregoing to 

 be parthenogenetic. The species is known from Australia. A third 

 form, which occurred chiefly under flower-pots with earth from Java, is 

 described as a new species, Orchestia senni, and attention is called to its 

 thoroughly terrestrial habitat. Only females were found. 



Jassa falcata (Mont.). J— Alfred 0. Walker discusses this Amphipod 

 and describes the gnathopods of the males and females. He finds that 

 the ovigerous females in one gathering differ not only in size but also in 

 the structure of the second gnathopods, so that the Iwo forms, if taken 

 in different localities, might easily be considered distinct species. This 

 seems to be the first record of dimorphism in females among the Amphi- 

 poda, though it is not uncommon in males. 



Remarkable Deep-water Calanoid.§— G. 0. Sars describes PJaty- 

 copia perphxa g. etsp. n., a remarkable new type of deep-water Calanoid 

 from the Norwegian coast. It was found in mud at .30-50 fathoms, and 



* Arch. Entwickmech., xxix.,(1910) pp. 432-8 (1 pi.). See also Zool. Zentralbl., 

 xviii. (1911) pp. 398-9. 



t Rev. Suisse Zool., xix. (1911) pp. 433-43 (9 figs.). 



X Trans. Liverpool Biol. Soc, xxv. (1911) pp. 67-72 (1 pi.). 



§ Arch. Math. Natur., xxsi. (1911) No. 7, pp. 1-16 (2 pis.). See also Zool. 

 Zentralbl., xviii. (1911) p. 520. 



