OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 275 



during dry weather is light grey, which as soon as the air gets damp becomes 

 gradually covered with spots of a dark (reddish) tint. The increase of humidity 

 in the atmosphere makes the spots larger, so that the shell is at last quite of a 

 dark (reddish) colour." If this and Nicolet's contrary account are both true, one 

 can only infer that weather forecasts in those regions are as little to be trusted as 

 in our own climate. 



The specimen obtained by the Scotia had the characteristic rostrum distally 

 upturned, with two pairs of lateral teeth ; between these there is a small central 

 tooth ; the peduncles of the eyes are denticulate, and a large tooth on the outer 

 side of each orbit projects a little beyond the eye ; the pleon is practically 

 symmetrical, without appendages, but with a medio-ventral process as shown in 

 Jacquinot's fig. 12. 



Length of carapace, including the rostrum, 49 mm., greatest breadth 44 mm. ; 

 length of fourth perseopods 110 mm. ; of the third not shorter. 



Locality.— Station 346. Burdwood Bank, lat. 54° 25' S., long. 57° 32' W. ; depth 

 56 fathoms; December 1, 1903. 



Together with the above was taken a small pellucid specimen, unfortunately with 

 rostrum broken off, measuring 18 mm. in breadth of carapace, by a length of 22 mm., 

 allowing for the lost rostrum. As with the larger specimen, the pleon of this juvenile 

 indicated that it was of the male sex. 



Genus Paralomis, White. 



1856. Paralomis, White, Pr. Zool. Soc. London, vol. xxiv. p. 134. 



1900. „ Stebbing, Pr. Zool. Soc. London, p. 531. 



1908. „ Hansen, Lngolf-Ezp., " Crust. Malac," vol. iii. part ii. pp. 22, 24. 



1913. „ Balss, Abhandl. K. Bayer. Ah. Wiss., suppl., vol. ii. part ix. p. 76. 



The validity of this generic name has been questioned by Benedict, who in 1894 

 regarded it as a synonym of Echinocerus, White, 1848. 



In 1847, in the List of Crustacea in the British Museum, White named without 

 defining a genus Echidnocerus, with a species E. cibarius. In the following year, in 

 the Proc. Zool. Soc, London, p. 47, pis. ii., iii., he described and figured the form in 

 question as a new species and subgenus, giving the first name as Echinocerus in the 

 text, but as Echidnocerus on the plates. It may perhaps be assumed that Echinocerus 

 was a misprint. However that may be, Benedict adopted it for Jacquinot's 

 Magellanic species, and instituted a new genus Leptolithodes for Henderson's Para- 

 lomis aculeatus, 1888, and several others. Subsequent opinion, however, has made 

 Leptolithodes, and not Echidnocerus, a synonym of Paralomis. But that some of 

 these generic divisions are not very easy to follow may be inferred from the remarks 

 which Hansen makes in 1908 when describing a new species, Paralomis bouvieri. 

 After stating that " the marginal plates on the third abdominal segment are quite 

 free in the male, but quite fused with the lateral plates in the female," he adds, 

 " as this feature in the marginal plates of the third segment is generally considered 



