14 TAGE SKOGSBERG, A NEW FRESH-WATER OSTRACOD. 
posteriorly, it is naked and only about half the length of the end-joint (sensorial?). 
The end-joint movable — contrary to the statement of G. O. SARS, |p. 11; it has five 
distal bristles; the anterior is of the same type as the two strong anterior claws of the 
last-mentioned joint but considerably shorter; three of them are ordinary, weak, naked 
or slightly pectinated bristles of somewhat different length, a little shorter or longer 
than half the length of the claw; the fifth, the sensorial bristle, proximally joined to 
the posterior of the three last-mentioned, attains about two thirds of the length of 
this bristle. The chitinous stripes on the basal joints exhibit some variability. 
Pelosity: First endopodit joint: on the anterior side, proximally, somewhat medi- 
ally, a hairy spot is to be found and distally to the middle, antero-laterally, a 
few, about five, transverse series of short, fine hairs (those of the distal series, along 
the distal edge of the joint, distincetly coarser than the others); along the posterior 
side of this joint, medially, about six such series are to be noted. Second endopodit 
joint carries proximally, anteriorly as well as posteriorly, on the medial side groups 
and rows of short very fine hairs and laterally to the end-joint a transverse series 
of such hairs; also the end-joint has latero-distally such hairs. 
Mandible: Masticatory process strong with six teeth, the outer one very strong, 
bifurcate, the others, gradually diminishing in size interiorly, all trifurcate; between 
the two outer teeth two rather strong and characteristic bristles are to be found (as 
was pointed out by C. Craus, 1893); they are somewhat S-shaped and both distally 
finely pectinated on one side; the exterior widened in its distal part like a spoon; 
between the other teeth groups of somewhat weaker short bristles, all naked and 
of ordinary type except one between the second and the third tooth (counting 
from outside) which is of the same type as the interior of those between the first and 
the second tooth; inside the interior tooth a group of similar naked bristles, all 
simple except the strongest of them, which seems always to be bifurcate; at the 
base of this group two beard-bristles (»Bartborsten», C. Craus); the plumose 
bristle on the exterior edge of the masticatory process attains about a fourth 
or a third of the length of this edge, measured from the ventral margin of 
the palp. The palp is four-jointed, its two proximal joints less distincetly defined. 
Second basal joint with four ventero-distal setx, three of which are long and rather 
strong, the remainder almost quite rudimentary; the proximal of the long bristles 
is almost naked, only bearing very small and fine hairs which are hardly visible, the 
two others, one of which points obliquely forward, very strong, carrying two rather 
thin rows of stiff secondary bristles. The exopodit — the branchial plate — with 
seven rays, one, very small, at the base, one at the middle and five distally. First 
endopodit joint: three naked dorso-distal bristles, two of which are subequal and 
about as long as or somewhat longer than the endopodit; the third of about half 
this length; ventrally this joint has five bristles, four long, armed with two rows of 
rather long and stiff secondary hairs, the remainder, also carrying stiff second- 
arv hairs, being relatively short. Second endopodit joint: somewhat distally to the 
— CR 
