38 Memoirs of the Indian Museum. [Vor aev 
the anterior margin. The dactylus bears six teeth including the terminal one ; the 
outer margin is convex and bears an acute lobe at the base. 
The lateral process of the fifth thoracic somite is, in the Indian specimens, rather 
longer than is indicated in Brooks’ figure ; it is almost straight and trends obliquely 
outwards and forwards. The pair of inferior spines are sharp. The lateral margins 
of the two succeeding somites are broadly rounded, those of the eighth somite are 
lobed anteriorly. The intermediate carinae of the free thoracic somites are distinct, 
but the submedians are either wholly absent or are represented only by obsolete traces 
on the last two somites. 
There are no submedian carinae on the first three abdominal segments, obsolescent 
indications of them may, however, be found on the fourth and fifth somites ; on the 
sixth they are invariably present and well developed. ‘The intermediate, lateral and 
marginal carinae are, as is usual, quite distinct. The following abdominal carinae end 
in spines :— 
Carinae Abdominal somites. 
Submedian ae s he 6. 
Intermediate Be ae BA (3) 4, 5, 6. 
Lateral bei be ey 8; 4,510. 
Marginal a 4c ; (1) (2) 3, 45 5+ 
These figures refer to the Indian specimens ; Brooks remarks that in the type 
spines are found on/y on the last somite. 
The dorsal surface of the telson is finely rugose and, on either side of the median 
crest, is obscurely marked with faint parallel furrows. The marginal teeth are well 
developed and there are one to three' submedian denticles, six to eight intermediate 
and one lateral. In the Indian examples the outermost median denticle is borne 
on the inner face of the intermediate tooth and projects distally beyond its fellows. 
There is no praelateral denticle. The post-anal carina is short but distinct. 
The bifurcate process of the peduncular segment of the uropods bears six to eleven 
sharp teeth on its inner margin and on the outer face of the longer spine there is a large 
and very conspicuous rounded lobe (fig. 24). 
The two largest specimens examined are males ; but, except for a feeble swelling 
at the base of each intermediate marginal denticle of the telson, no distinctive sexual 
modifications are to be found. 
The Indian examples of S. data differ from Brooks’ account in the possession of a 
dorsal spine at the distal end of the peduncle of the uropods and in a few other details 
noticed above, the most important being the greater abundance of spines on the 
abdominal somites. Should the distinctions prove constant it may be necessary to 
separate specimens from the Bay of Bengal under a distinct subspecific name. 
Spirit specimens exhibit no characteristic colouring. 
The three examples in the collection are registered as follows :— 
1707—9 
1) Gulf of Martaban, Burma; 53 fms., 
14°38'12” N., 96°24’30” E. ‘Investigator.’ 16,29 ,64—76 mm. 
' Two or three in the Indian examples, a single broad lobe in the types. 
