rosea ORTMANN— AFFINITIES OF CAMBARUS. 97 
horny teeth, which are sometimes recurved, or compressed, or plate- 
like, and are always sharply distinguishable from the blunt end. 
Inner part terminated by a shorter or longer, acute spine, which is 
sometimes distinct from the tip of this part, so that it appears two- 
pointed. In the male the third or the third and fourth pereiopods 
have hooks. 
2. Subgenus: CAMBARELLUS nov. subgen. 
Sexual organs of male sfow/, straight, or slightly curved at the 
tips. Outer part ending in two horny teeth, which are rather long, 
taper rapidly, and are zot sharply distinguishable from the end, 
which ts not truncated. Inner part terminated by a rather long, 
acute spine. In the male, the second and third pereiopods have 
hooks. 
[The two following subgenera represent the third type of male 
sexual organs, in which both parts, outer and inner, each terminate 
in only one tooth, which is rather slender, and wot sharply distin- 
gutshable from the end, which is never truncated. | 
3. Subgenus: Faxonius nov. subgen. 
Sexual organs of male shorter or longer, zot very stout, generally 
slender, or with slightly curved tips. Zips never truncated, ending 
always tn two more or less elongated spines, the one formed by the 
outer part, and horny, the other formed by the inner part and 
softer. There is zever more than one tip to the outer part, and there 
is no terminal tooth distinguishable, but the tip tapers gradually, 
or the whole outer part is setiform. In the male generally the third 
pereiopods only have hooks, very rarely (in C. pellucidus) hooks 
are found on third and fourth pereipods. 
4. Subgenus: BARTONIUS nov. subgen. 
Sexual organs of male very uniform throughout the subgenus. 
They are short and thick, inner and outer part each terminating in 
only one short and thick spine, tapering to a point. Both terminal 
spines are strongly recurved, forming with the basal part about a 
right angle. In the male, only the third pereiopods possess hooks. 
Subgenus: CampBarus. (Type: C. dlanding?.) 
This subgenus comprises Faxon’s first and second group, exclud- 
ing thespecies C. peMlucidus. Both groups are rather heterogeneous, 
and so is this subgenus, and there are considerable variations in the 
male sexual organs. ‘The chief feature of the latter is their blunt 
