, . 
CRUSTACEA OF THE MERGUI ARCHIPELAGO. 95 
which I had sent to him, with the typical specimens of Latreille’s 
T. indica, which is closely allied to this species. According to 
Prof. Milne-Edwards, 7. Stoliczkana differs from 7. indica by 
the more dilated branchial regions, by the less profound gastro- 
branchial groove, by the more sharply defined protogastric (epi- 
gastric) lobes, and by the deeply emarginate frontal margin, 
which in 7. indica is entire. 
T. Stoliczkana is also allied to ZT. Larnaudii, Alph. Milne-Edw., 
a species which not only inhabits Siam but also the island 
of Sumatra, as I indicated some years ago in my Note on 
the Crustacea collected by the Dutch Sumatra Expedition (de 
Man, Crustacea, in P. J. Veth’s ‘Midden-Sumatra,’ Leiden, 
1880, iv. pt. xi. p. 2, pl.1.). Prof. Milne-Edwards having sent 
me a typical specimen of 7. Larnaudi from Siam, I am enabled 
to describe the characters by which this species may be distin- 
guished from ZY. Stolicekana. In T. Larnaudii the epibranchial 
teeth are situated closer to the external orbital angles, so that the 
distance between the epibranchial teeth and the external orbital 
angles is comparatively shorter. It is in consequence of this 
difference that both species present an entirely different outer 
appearance. The front is more granular in 7. Larnaudit, and less 
profoundly emarginate; the postfrontal crest, of which at least the 
external portions are straight and entire in 7. Stoliczkana, pro- 
ceeding continuously and uninterruptedly to the epibranchial 
teeth, is in Z. Larnaudii much more interrupted not only in its 
inner or epigastric, but also in its external portions, which are 
not prolonged in an uninterrupted line to the epibranchial teeth. 
In my figure of the Sumatran 7. Larnaudii this latter character 
has unfortunately not been correctly represented. In 7. Lar- 
naudi the antero-lateral and epigastric regions are more trans- 
versely rugose, and the inflected subhepatic and pterygostomian 
regions, which are smooth or nearly smooth in 7. Stoliczkana, are 
covered in the former with numerous oblique and transverse 
rugose lines. 
The largest specimen of 7. Stoliczkana in the Collection, a 
male, is 52 millim. broad and 39 millim. long (the abdomen not 
included), the proportion of the length to the breadth being as 
3:4, the same as in Wood-Mason’s typical specimens. 
T. Stoliczkana was discovered at Penang, and is a species proper 
to the islands which are situated near the western coast of the 
Malayan peninsula. 
