ENTOZOIC COPEPOD FROM JAPAN. 22M 
the stages, beg merely a papilla with but slight elevation above 
the surface. Relatively to the mouth-parts it is situated some- 
what postero-laterally (Pl. 21. fig. 2, mp.?), and is less con- 
spicuous in specimens boiled in potash than in those which have 
been treated with borax-carmine (or alum-carmine), and cleared 
in oil of cloves. 
According to other authors, the second maxillipede is a very 
important appendage in Clausidiwm, Hersiliodes, and Giardella, 
and, unlike the first maxillipede, it differs in these genera in the 
female and male. In Clausidium female, Canu says it has three 
parts (Claus describes four), bearing sete; in the male it has 
two well-marked basal joints and a terminal factor in the form of 
a short prehensile hook. In the female of Giardella it is as in 
Clausidium ; but in the male of Giardella and Hersiliodes there 
is one basal joint with two feathered sete, a median long joint 
with teeth on its mner ridge and two sete on its internal face; 
finally there isa terminal segment in the form of a spine recurved 
towards the end and almost as long as the rest of the maxillipede. 
Speaking of the family as a whole, Canu remarks :— Maxilli- 
pedes bien développés: les internes fournissant d’importantes 
différences sexuelles.” I cannot help thinking that Canu has 
named the two pairs of maxillipedes erroneously. Those which 
Claus calls ‘“‘vordere” and “ hintere,” I call respectively “ first ” 
and “‘second.” Canu uses the terms “interne” and “externe,” 
yet his description and figure of the pair designated “ interne ”’ 
coincide with the ‘“‘ hintere” of Claus and my “second”; by 
“externe,”’ therefore, we must conclude he refers to the “‘vordere” 
(or “‘ obere’’) or first maxillipede, which he says is alike in both 
sexes. In Goidelia japonica, however, neither the first nor the 
second maxillipedes are alike in the female and male: the first 
maxillipede is highly specialized in the female and small and 
unimportant in the male; the second maxillipede being, con- 
versely, important in the male and inconspicuous in the female. 
These appendages seem to offer peculiar difficulties, for Koss- 
mann has mistaken the first maxillipede for a second maxilla, 
concerning which Claus observes :—“‘ In Wahrheit aber ist 
Kossmann’s zweite Maxille der obere Maxillarfuss, und die als 
Maxillarfuss beschriebene Gliedmasse der Kieferfuss des zweites 
Paares. Der obere Jieferfuss sehliesst sich nach Form, Lager 
und Gebrauch am nichsten an die gleichwerthigen Gliedmassen 
der Coryceiden (Copilia, Sapphirina) an, und fihrt in weitere 
