246 AMERICAN PARASITIC COPEPODA. 
of the terminal portion of the oviduct. Three or four short chitinous 
pieces situated above the opening, and connected with each other, 1 
at first supposed to be a coiled tube similar to that described as 
passing in various free forms from the receptaculum seminis to the 
end of the oviduct. But there is no trace of a receptaculum seminis 
in Ergasilus, and these chitinous pieces serve to form a hinge for the 
two longer pieces which stretch back within the segment on each 
side. (Fig. 18). The muscle attached to the shorter chitinous 
pieces may serve to abduct the egg sacs. 
The furcal bristles are differently disposed from any described 
species of Ergasilus. I am not confident that the arrangement 
represented in Fig. 7 is constant, but it seems fairly common. 
Some variability must be assigned to these structures, as Olsson 
(Joc. cit.) has noticed the occurrence of three in #. Sieboldii, and I 
have observed the internal (stronger) bristle bifureated on one or 
two occasions. 
The ezg:ssacs, although often unequal, are generally twice the 
length of the body of the female. 
ie 
LERNZOPODA EDWARDsII. Olsson. 
(Prodromus faunze Copepodorum parasitantium Seandinavie. Act. Univ. Lund., 
1868, p. 36.) 
Prof. Osler, Montreal, obtained several specimens of a species of 
Lerneopoda from the gills of the brook trout (Salmo fontinalis), 
which differs markedly from the S. Salmonea of Baird, but agrees 
very well with Milne-Edwards’ figure of Basanistes Salmonea from 
Salmo umbla (Hist. Nat. d. Crust., Tab. XLI, f. 3). In the above- 
cited memoir, Olsson proposes the specific name of L. Hdwardsii for 
Milne-Edwards’ form, and describes its characteristic features from 
specimens (from unknown host) in the Museum of the University of 
Lund. It can hardly be doubted that, at any rate, this species of 
Basanistes is a true Lernewopoda.” 
1 Aug. Gruber, Zeit. Wiss. Zool. XXXII., p. 407 seq. 
2 Apart from the rounded tubercles on the abdomen of B. huchonis, the shortness and 
thickness of the ‘‘arms,” and their separate attachment to the chitinous bulla, are regarded as 
characteristic of the genus ; but the different species of Lernzeopoda vary much in this respect. 
In the form described in the text it is easy to prepare the bulla into the halves belonging to 
each arm. 
