THYSANOPODA PECTINATA. 219 
of strong, partly long setae, and from that part a quite peculiar lobe projects 
forwards, closely covering the major part of the proximal half of the second 
joint; the lobe is at its origin about half as broad as the base of second joint, 
but it is rapidly strongly expanded outwards, thus furnished with a kind of 
triangular lateral wing projecting outwards and somewhat downwards above 
the upper lateral surface of second joint; the anterior margin of the lobe, the 
wing included, is straight or a little concave, nearly transverse and produced 
in a row of 8 to 13 thin, spiniform processes which increase in length from the 
inner to the outer, the inner being short and directed forwards, the outer rather 
long and directed outwards to a great degree. The second joint is above and 
inwards produced in a lobe which, seen from above, covers closely the proximal 
third or rather two fifths of the inner half of the upper surface and the inner 
margin itself of third jot; seen from above the outer angle of this lobe is con- 
vex, subangular, or rounded, while the front margin of the second joint is some- 
what hollowed outside the base of the lobe. The third joint with the dorsal 
keel well defined, scarcely half as long as the joint and rather low.— The anten- 
nal squama reaches the middle of third antennular joint, it is broad, distally 
subtruncate with the outer corner subrectangular and without denticle; the 
spiniform outer process from the subbasal joint is conspicuously or even consid- 
erably shorter than the breadth of the squama.— The maxillulae (fig. 1d) are 
quite peculiar; the proximal lobe has the end nearly regularly rounded; the 
distal lobe is extremely broad, distally strongly expanded, broader than long 
and twice as broad as the proximal lobe; the palp (4.) is very small, ovate, 
not one third as long as the distal lobe, completely covered by the pseudexopod, 
which is very large, twice as long as broad. 
The abdominal segments are without any trace of dorsal denticles. The 
lateral plates of second to fourth segments with the lower margin a little 
emarginate. The preanal spine well developed, simple in the male, more rarely 
simple, but generally bifid in the female.— The uropods with the endopod 
slightly or somewhat longer than the telson and somewhat shorter than the 
exopod.— The telson with two pairs of dorsal denticles and no serration; the 
subterminal spines extremely long. 
The copulatory organs (figs. le-1i) afford excellent characters. The spine- 
shaped process (p'.) is rather long, thin, bent strongly inwards near the end of 
its first third and with the distal part somewhat curved. The terminal process 
(p?.) with its proximal third thick and subcylindrical; then it is curved slightly 
inwards and gradually widened and flattened to the end, which is conspicu- 
