722 KECORD OF CURRENT RESEARCHES RELATING TO 



while in the male the same ai^pendagcs are twelve-jointed, and six of 

 the joints have an olfactory function ; in A. aquaticus the number of 

 joints in the antennae is large, but still only three are olfactory, while 

 in the largest of the males the number of " olfactory joints " is only 

 four. The increase in the number of these appendages in the male, 

 which even in A. aquaticus has one more than the female, is duo 

 probably to sexual selection, and to the necessity of the blind male 

 seeking the female in the dark cave. The first pair of swimming legs 

 in the female of A. aquaticus are rounded, thin, and thickly covered 

 with fine hairs, while in A. cavaticus they are semilunar, with a broad 

 basis and continued to a sharp point, while the hairs are either com- 

 pletely absent or sparse and short. An arrangement obtains in the 

 liver of A. cavaticus, which is only temporary in A. aquaticus; the 

 superior pair of hepatic tubes are scarcely a quarter of the length of 

 the inferior pair, while in the other form they gradually attain to the 

 same length, and extend along the whole of the body ; but, as if in 

 compensation for this, the constituent hepatic cells are of a much 

 larger size. 



New Peltidia.* — Dr. G. Haller, in describing some new Peltidia, 

 states that he preserved these small Copepods in Farrant's medium, 

 which retained the colour and external form admiiably. The new 

 Zausoscidia is so called from its having the general structure of 

 Oniscidium with the characters of Zaiis in the two rami of the first pair 

 effect. The single species is called i^oZw. A Porcellldiu7n smaller than 

 any yet known (^ "55 mm., and the $ -71 mm.) is described under 

 the name of parvulum. Three new species of Oniscidium are also 

 described briefly. 



Vermes. 

 New Species of Tsenia.t — Professor Perroneito describes a form 

 which he has known for several years, and of which he has obtained 

 a large number of specimens ; hitherto confounded with T. expansa 

 or T. denticulata, it is always characterized by its constantly white 

 colour, hence the name alba now proposed for it. A technical descrip- 

 tion and a plate follow. 



M. Moniez describes J T. Giardi, which is frequently foimd in 

 the sheejD, and which differs from T, denticulata in the position occu- 

 pied by the male products, and by the arrangement of its ova ; as to 

 the development of these latter, it is pointed out that the elements 

 of the " fundamental tissue " are not converted into a reticulum, but 

 form a continuous band ; this band takes on an undulating direction, 

 in which it is followed by a narrow canal, into which the ova pass 

 after fecundation ; the ova gradually pass into the interior band, and 

 it and the outer wall of the canal form a capsule for them. The 

 receptaculum seminis gives rise to three " currents " of ova, two of 

 which pass into the adjacent ovary, while the other passes over to the 

 other side. 



In T. pectinata a number of irregular and communicating clefts 

 * • Zool. Anzeiger,' ii. (1879) p. 178. 

 t ' Arch. Naturg.,' xlv. (1879) p. 235. 

 X 'Comptes Reudus,' Ixxxviii. (1879) p. 1094. 



