198 
THE VOYAGE OE H.M.S. CHALLENGER. 
In the specimen from Ternate, the third of the frontal teeth is less distinctly 
truncated, narrower and more rounded at its extremity than in other adult examples I 
have examined. 
Adult <1 . Lines. Millims. 
Length of carapace, nearly . . . . . . 18 • 37 - 5 
Breadth of carapace, . . . . . . . 244 52 
A female from the Philippine Islands (Samboangan) is in the collection, which is in 
some degree intermediate between this species and the newly-allied and perhaps not 
distinct Thalamita stimpsoni, A. Milne Edwards. In this specimen the frontal lobes 
altogether resemble those of Thalamita prymna , but the basal antennal joint bears a line 
of strong granules in place of the well-developed spines of that species. The fourth 
antero-lateral marginal tooth is reduced to a mere insignificant rudiment, not discernible 
except by close examination with a lens. 
? . Lines. Millims. 
Length of carapace, . . . . . . ,12 25 
Breadth of carapace, . . . . . . .18 38 
Thalamita stimpsoni, A. Milne Edwards. 
Thalamita stimpsoni, A. Milne Edwards, Archiv. Mus. Hist. Nat., voL x. p. 362, pi. xxxv. 
fig. 4, 1861. 
Samboangan, 10 fathoms (from the reefs). A small female, bearing ova. 
The fourth antero-lateral marginal tooth in this specimen is on one side wholly absent, 
and on the other represented by a mere insignificant rudiment. In all other characters, 
and particularly in the characteristic form and disposition of the frontal lobes, this 
specimen agrees with the description and figure cited. 
Adult 5 • Lines. Millims. 
Length of carapace, . . . . . . 5J 11 "5 
Breadth of carapace, . . . . . . . 8J 18 
Two small and immature females are in the collection from Nukalofa, Tongatabu, 
18 fathoms (Station 172), which are perhaps young of this species. They differ, however, 
in the form of the frontal lobes ; the lobes are smaller and less prominent, and the next on 
each side narrower, rounded, and very distinctly separated from the submedian lobes by 
a deep fissure. The larger has the following dimensions : — 
? . Lines. Millims. 
Length of carapace, . . . . . . . 3 6 - 5 
Breadth of carapace, . . . . . , . 4£ 9 5 
