NO. 6 DECAPOD AND OTHER CRUSTACEA SCHMITT IJ 



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. rooscvelti 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. c.vctastica 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. exciastica; 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 



