6 C. BOVALLIUS. NEW ISOPODA. II. 
of the margin. The urus is a little shorter than the pleon 
(11:12). The urus and pleon together are much shorter than 
the pereion without the head (23:38), but equal exactly the 
length of the four last pereional segments. On its upper 
side it is smooth, in the middle marked by a broad obtuse keel. 
The uropoda (P1. I. fig. 10) reach beyond the end of the 
urus. The projection at the inner side of the peduncle is 
short but sharp. The rami are equal in length, longer than 
the peduncle. The inner one is broader than the outer (4: 3), 
slightly emarginated in the outer margin. The are both ar- 
med and fringed in the same manner as the margins of 
the urus. 
Colour. Yellow. 
Length. 18 mm. 
Hab. The west coast of Sweden (C. B-.). 
Only one!) specimen known taken by the author at the 
Koster-isles, Bahusia, at a depth of 80 fathoms. 
2. Aega ventrosa. ScHIoEDTE et MEINERT ?) (non M. SARS). 
When comparing the description of Aega ventrosa given 
by M. SaArs ?) with that given by SCHIoEDTE and MEINERT ') 
I have been induced to think, that two very different species 
must have been types for the two descriptions, as the latter 
description scarcely agrees with the original in any essen- 
tial point. As the hondrable authors of the last description 
among other specimens, obtained from Norway cite: »M. SARS, 
specimen typicum, Mus. Christian.>, they are certainly right in 
using the name of Aega ventrosa, SArRs. But I am inclined 
1) If it not will be proved that Aega ventrosa, SCHIOEDTE and MEINERT, 
is identical with it. 
2) Professor MAX WEBER mentions an Aega from BARENTS Sea, which he 
supposes to be a young Aega ventrosa, SCHIOEDTE and MEINERT; but 
it shows considerable differences. In: »Onderzoekingstochten van DE WIL- 
LEM BARENTS, 1:te Gedeelte, II. Die Isopodem, p. 6. Bijdragen tot de 
Dierkunde, uitgegeven door het Genotschap Natura artis magistra, te 
Amsterdam. 10:e Aflevering. Amsterdam 1884. 4:0. 
»Oversigt over de i den norsk-ärctiske Region forekommende Krebsdyr» 
in Forhandlinger i Videnskabsselskabet. Aar 1858. Christiania. 1859, 
p. 154. 
4) >»Symbol&e ad monographiam Cymothoarum» in Naturhistorisk tidskrift. 
1879, p. 375. Copenhagen. 
3 
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