74 
On the J' see the list below. 
C aeherusieum 
C. Bonelli 
rostrum 
very deminutive, covers at most 
abt. i/io of 1 . peduneular joint 
of ant. 1 . 
covers abt. the proximal 2/5 of 
1 . peduneular joint of ant. 1 . 
ant. 1 . 
1 . peduneular joint has on the 
median ventral edge 2—3 (Costa) 
or 3—4 spines (my own spec.), 
the proximal of which is situ- 
ated on the apex of a little pro- 
cess (Costa, not my own spec.). 
The two First peduneular joints 
have a few short setæ (most of 
them mueh shorter, none of 
them longer than the breadth of 
the joints). 
1 . peduneular joint is totally de- 
void of spines, but has off the 
proximal third of the median 
ventral edge a lamellar process, 
the apex of which is situated 
somewhat behind the apex of 
rostrum. The two First pedun¬ 
eular joints have numerous long 
setæ, most of them mueh longer 
than the breadth of the joints. 
ant. 2 . 
The proximal tooth on the under- 
edge of 4. peduneular joint large, 
triangular, sharp pointed (Della 
Valle fig. 21). 
The whole of the antenna mue 
in C. aeherusieum. 
The proximal tooth on the under- 
edge of 4. peduneular joint little, 
rounded, blunt (fig. 3A. 2 )- 
a more setose in C. Bonelli than 
Key to the Corophium-species with I.—3. urosome segments coalesced 
(the doubtful species 
C. contractum Stimpson is not included in this key). 
1. The coalesced urosome segments have in dorsal view al¬ 
most parallel sides; no notch at the,place where urop. 1 
are fixed . 2. 
The coalesced urosome segments have in dorsal view not 
parallel sides; there is a distinet notch for the fixation of 
each urop. 1. 3. 
1) Corophium contractum Stimpson, Proc. Acad. Nat. Hist. Philadelphia 
vol. 7, 1855, p. 383 (loc. “Japan“). — C. c.: Thomson, Trans. New Zea¬ 
land Inst. vol. 13, 1880 (1881), p. 220, PI. 8 fig. 9 (loc. Dunedin habour, 
4—5 fms.). — C. c.: Thomson and Chilton, ibid. vol. 18, 1885 (1886), 
p. 142 (loc. Dunedin, Lyttelton). — C. c.: Della Valle 1893, p. 374. — 
C. c.: Stebbing, Tierr. 1906, p. 692. 
