29 2 
TIIE TANGANYIKA PROBLEM. 
hepatic spines are present on the carapace, the surface of which is elsewhere smooth. 
The third maxillipeds extend beyond the peduncle of the antenna; by the length of 
their last joint. The first perajopods (Fig. 21) extend to or a little beyond the tip 
of the antennal scales. The carpus is rather longer than the merus, and more than 
half as long again as the hand. 
The second perceopod of a male specimen (Fig. 22) is about two-thirds the length 
of the body, and the distal end of the merus extends to beyond the middle of the 
antennal scale. The carpus is equal in length to the merus, somewhat expanded 
distally, where the breadth is about one-fifth of the length. The hand is rather 
wider than the distal end of the carpus, not perceptibly compressed (the two 
diameters are about as 5 : 6), a little less than twice the length of the carpus. 
Palm shorter than the carpus, and rather shorter than the fingers. Fingers straight, 
meeting along their whole length ; inner margins with smooth cutting-edges, 
without any trace of teeth save a single very minute tubercle near the base of the 
dactylus. The surface of the whole limb bears widely-scattered very minute seta; ; 
on the distal part of the carpus and on the inner side of the palm are a number of 
small spinules. The succeeding pairs of perreopods are long and slender, the 
fourth pair extending beyond the antennal scale. The dactylus is nearly one-third 
the length of the propodus. 
End of telson (Fig. 24) with a sharp median point, longer than the outer but 
shorter than the inner pair of terminal spines. 
Seven specimens, most of them very imperfect, are in the collection ; only one of 
the large chela; is preserved. One specimen is a female carrying ova. The species 
was dredged at a depth of 50 feet. 
Length of largest specimen ( ), 25 mm. 
Length of ovigerous female, 23 mm. 
Length of specimen figured ( & ), 18 mm. 
Length of second peraeopod of same, 11.5 mm. 
The species appear to fall into the group Eupalamon as defined by Orlmann 
(Zool. Jahrb., Abth. f. Syst. v. 1891, p. 696), in which the second pera;opods 
are cylindrical, while the equality of the merus and carpus of these appendages and 
the characters of the telson will bring it into proximity with such species as 
P. scabricuhis Heller and P. endekensis de Man. P. niloticus Roux, the only 
species known from North America, is somewhat similar to the present form, but, 
so far as can be judged from the more or less defective figures and descriptions of 
Roux (Ann. Sc. Nat. xxviii. 1833, p. 73, pi. vii. f. 2) and Klunzinger (Zeitschr. 
f. wiss. Zool. xvi. 1866, p. 357, pi. xx.), appears to present distinctive characters. 
Both these authors figure the rostrum with a very convex upper edge. Klunzinger 
gives the number of serrations as 9 — * 3 , Roux figures 1 1 . According to the figures 
of both authors, however, not more than one tooth appears to be behind the orbit. 
Both show the carpus of the 2nd perteopod to be distinctly shorter than the merus, 
and much more than half the length of the hand. Klunzinger’s figure of the chela 
shows it to be more slender, with the palm less inflated and the fingers longer than 
in our species. 
Neither of the species can be depended on as throwing any light on the general 
question of the origin of the Tanganyika fauna. The genus Paltemon contains 
