NO. 6 
DECAPOD AND OTHER CRUSTACEA SCHMITT 
The length of the carapace is very nearly two-thirds its greatest 
width, the posterior margin just about a third. The transverse ridges 
or keels on the carapace are well defined and finely crenulate on their 
anterior margins ; in number, position, ornamentation, and arrange- 
ment they are not unlike those of T. gardineri as figured by its author. 
I cannot make out from Borradaile’s drawing whether the entire sur- 
face of the carapace is finely granulate, or whether just its dense pubes- 
cent investiture is indicated. Except for the keels and several small 
patches of granules, the carapace of T. roosevelti is covered with a 
short, thick pubescence that hides its surface. This was found to be 
smooth and finely punctate where the pubescence was scraped off 
with a needle. Just behind the bases of the adjacent portions of the 
median and submedian lobes of the front, and also toward the bases 
of the second and third lateral teeth of the carapace, there is a small 
scattering of granules which rise at least to the level of the top of 
the short pubescent covering of the carapace and are not at all 
obscured by it. 
In both T. gardineri and T. alcocki the anterolateral margin is de- 
scribed as more oblique than in T. exctastica Alcock ( Journ. Asiatic 
Soc. Bengal, vol. 48, p. 86, 1899), and so is it also in our species. 
The median lobes of the front are separated by a distinct, narrowly 
U-shaped sinus which runs backward behind the level of the anterior 
margins of the submedian lobes as far as, or even a little farther than, 
the sinus either side of the median lobes which separates them from 
the submedian lobes. In T. alcocki the median sinus of the front runs 
back only to the level of the anterior margins of the submedian teeth, 
much as in T. exctastica: in T. gardineri this sinus is like that of 
T, roosevelti in depth. The median lobes are distally rounded off* ; the 
right one is a little wider than the left ; in the front the median lobes 
are placed at a slightly lower level than the submedian lobes ; these 
slightly yet definitely overlap the median lobes. In T. gardineri there 
is no overlapping of the median lobes by the submedians. The an- 
terior margins of the submedian teeth, though lightly convex, are in 
general transverse, more so in the young, immature specimens than 
in the larger type specimen. In T. alcocki the anterior margin of the 
submedian lobes is said to be very straight and transverse. The outer 
lobes of the front above the antennae are separated from the sub- 
median lobes by a sinus about the size and shape of the median sinus 
of the front, only a little deeper ; the lobes of this outer pair are 
narrowly triangular, distally blunt. 
Of the teeth of the anterolateral margin, the first (extraorbital) is 
the largest, though not quite the longest measured along its outer 
