26 Memoirs of the Indian Museum. [Vor. IV, 
convergent posteriorly and the intermediates more or less curved inwards The follow- 
ing abdominal carinae end in spines‘ :— 
Carinae. Abdominal somites. 
Submedian a a ae 6. 
Intermediate .. er 36 5a Oe 
Lateral ats an 55 5, 6. 
Marginal <2 "s ae (2) (3) 4; 5. 
The telson (figs. 1, 2) is considerably broader than long and is strongiy convex 
dorsally. The median carina is distinct, very obscurely notched at the base, and in 
most cases terminates in a short spine; on either side of it there are a number of 
ridges which are usually broken up into tubercles. Close to the median carina on each 
side a row of from three to six tubercles is usually found, the two rows converging 
posteriorly and meeting in a small tubercle immediately behind the distal end of 
the carina. Beyond this there are a number of oblique ridges—in some cases very 
obscure, in others sharp and broken up into a series of tubercles—and, in addition, 
several isolated tubercles or transverse tuberculate ridges may usually be seen close to 
the proximal margin. ‘The six marginal teeth are acute but short ; the submedian pair 
is provided with minute movable tips, but these in most well-grown specimens are 
broken off. The outer edges of at least the intermediate pair are serrate and a small 
blunt praelateral lobe is usually distinct. There are one or two pairs of submedian 
denticles, four to seven intermediate, and one lateral, and these like the primary teeth 
frequently possess serrate margins. The ventral surface of the telson is quite smooth 
except for a short, but well-marked, post-anal crest. 
In adult males (fig. 2) the median carina is rather more swollen than in the female 
(fig. I) and there is an enormously inflated triangular swelling at the base of each mar- 
ginal tooth. The tubercles, moreover, are generally more rounded and less conspicuous 
than is the case in the other sex. 
Wood-Mason (1895, pl. iv, figs. 8, 12) has given two figures of the telson of this 
species and two additional figures will be found on Pl. I, figs. 1 and 2. The latter, 
which were drawn from specimens obtained in the Persian Gulf, differ considerably 
from the more normal types figured by Wood-Mason, that of the female, in particular, 
showing quite an extreme tubercular development. 
The peduncular segment of the outer uropod (figs. 1, 2) is provided with a single 
dorsal spine near its articulation with the exopodite. The inner spine of the ventral 
bifurcate process is more than twice the length of the outer and bears a well-developed 
lobe on its external aspect. Internally the process is armed with five to eight sharp 
spines. The spines on the outer margin of the basal segment of the exopod are flat- 
tened and curved and the ultimate is fully two and a half times as long as the next of 
the series. 
' This tabular method has been adopted for showing the position of the spines on the abdominal 
somites. Numbers in brackets indicate that spines occur on these somites in some specimens, but not 
in all. (See p. 9.) 
