122 
Walter M. Tattersall. 
Order Euphausiacea. 
Family Euphausiidae. 
1. Miiphausia mülleri Claus. 
E. pellucida (pars), Lo Bianco (1901 and 1903). 
E. mülleri^ Hansen (1905b). 
Since the appearance of Dr. Lo Bianco's reports on the collec- 
tions of the Maia and Puritan, Hansen has published two preliminary 
notices of the Schizopoda collected by the^ Prince of Monaco, in the 
second of which he shows that the species known hitherto as 
Eupkausia pellucida Dana, is a compound one, embracing at least 
4 distinct species. The Mediterranean material, examined in the 
light of Hansen's work, proves to contain 2 of these species which 
Dr. Lo Bianco included under the one name, E. pellucida. 
The first of these species is E. mülleri, the earliest known member 
of the genus. It appears to be a very abundant species, since it 
was present in 10 gatherings of the Maia collections and in no 
fewer than 35 of the hauls made by the Puritan. The largest 
specimens measured 18 mra. 
2. Muphausia brevis Hansen. 
E. pellucida (pars). Lo Bianco (1901 and 1903). 
E. brevis, Hansen (1905 b). 
I find this species to be readily distingui shable from E. mülleri 
at ali sizes above 6 mm. It appears to be nearly as abundant a 
species as the last, occurring in 9 of the Maia gatherings and 21 of those 
of the Puritan. It was captured 27 times in company with E. mülleri. 
None of the specimens exceeded 10 mm in length. 
Time did not permit of my separating ali the Euphausia hrevis 
from E. mülleri. In large gatherings I satisfied myself as to whether 
one or other or both species were present and in the tables accom- 
panying these notes, a bracket including E. mülleri and E. hrevis, 
followed by a number, indicates that both species were present, the 
number including ali specimens of the two forms. 
3. Euphausia gibba G. 0. Sars. 
E. gibba, Lo Bianco (1901 and 1903). 
This species was almost as equally well represented in these 
collections as the previous two members of the genus. It occurred 
