70 RECORD OF CURRENT RESEARCHES RELATING TO 



cases almost invariable in this respect for ©acli species, afford good 

 classificatory characters. 



Among the forms described wbich are new to science is Campo- 

 gnatlia Sclmetzleri, forming the second of the two known species of the 

 genus, both occurring in deep water in the lake. Of the remaining 

 new species, Hygrobates nigro-maculatus, Limnesia variegata, tricolor, 

 iesselata, triangularis, cassidiformis, are littoral, and exhibit the six 

 abdominal disks. 



In a new genus, Neumania, is placed a swimming form {N. nigra) 

 with confluent eyes, the back carrying a large white cross on a black 

 ground; the genital opening is surroimded by triangular plates 

 covered with black spots. Another species, N. alba, differs chiefly in 

 the absence of a true genital area. Of the two Arrenuri {A. tuhercu- 

 latus and hiscissus), the first has its genital orifice surrounded by two 

 pairs of plates, the outer punctate, but neither with "disks." In 

 Nescea magna and N. lutescens the genital a'ea is indistinct, and bears 

 in the one case four, in the other five " disks " ; the back of the former 

 species is singularly marbled with chocolate on a yellow groimd. 

 The name PacJiygaster tau-insignitus is given to a species distinguished 

 by a complicated genital area with six disks. In Fiona accentuata 

 the area is invisible. Brachypoda is a minute type, only • 56 mm. in 

 length, in the only species, B. paradoxa, here described ; the legs 

 are short and stout, the fourth pair carrying a considerable spur after 

 the fourth joint, the following joints being excessively hirsute. In 

 all, including a Gampognatha already described by the author, and 

 Atax crassipes, and A. ypsilop>horiis, nineteen species occur in this fauna, 

 of which seventeen, and among them the types of four genera peculiar 

 to it, are not elsewhere known. The only parasitic form is Atax 

 ypsilophorus. 



8. Crustacea. 



Action of Poisons on Crustacea.* — M. Yung finds the Crustacea 

 to bo very sensitive to the action of the chief poisons. Experiments 

 on Macrura and Brachyura show that curare acts as on Vertebrata, but 

 slowly, producing sluggishness in the movements, which is converted 

 into paralysis by strong doses. Strychnine acts with great rapidity and 

 violence, causing sensible tetanus. It cannot be introduced into the 

 system by the branchiae. Atropine causes exhaustion, never death. 

 The heart's action is slackened, after a slight acceleration, by Digita- 

 line. Nicotine is distinguished by its very rapid production of mus- 

 cular rigidity and of quickened pulsations of the heart. 



New Podophthalmous Crustacea. f — Dr. J. G. de Man describes 

 (in English) three new genera and ten new species from the Ley den 

 Museum. 



Limnocarcinus {\.i(xvr}, a marsh) is a new genus of the family of 

 Gecarcinadse (subfamily Gecarcininse of Wood-Mason). Eront not 

 united to the internal suborbital lobes, as is the case in Hylceocar- 

 cinus Wood-Mason ; the flagella of the antennae projecting into the 



* 'ComptcB Eendus,' Ixxxix. (1879) p. 183. 



t 'Notea from R. Zool. Mus. Nethcii.,' i. (1879) p. 53. 



