CRUSTACEA 307 
abdominal segment between the sub-median and the lateral 
carine. The number of teeth on the posterior margin of the 
terminal segment between the sub-median and the lateral spines 
evidently varies with the age of the specimen; in most of the 
Nora Niven specimens there are eleven or twelve of these teeth 
though in some cases only ten, while in the larger specimens 
in the Dominion Museum the teeth are fewer, there being only 
eight; in the largest specimens the teeth are rather rounded and 
not pointed. 
A. Milne-Edwards has given a fuller description of Squilla 
armata in the Mission du Cap Horn, and my specimens agree 
well with his description. He is inclined to unite with it 
S. gracilipes Miers® which is described as having ten teeth on 
the dactyls of the raptorial limbs. The number of these teeth 
is, as he points out, sometimes subject to very consider- 
able variation in the same species as I have also noted in 
the case of Lysiosquilla spinosa. Squilla gracilipes however 
also differs according to Miers’ description in having about 26 
denticles between the sub-median marginal spines and about 
18 on each side between these and the first lateral spines: the 
number of teeth between the sub-median and lateral spines 
doubtless varies, as I have already mentioned, according to age, 
but in all the adult specimens of S. armata that I have examined 
the margin between the sub-median spines is smooth except for 
the median fissure. It seems hardly likely therefore that 
Squila gracilipes can belong to this species. 
In general appearance and in the character of the posterior 
margin of the terminal segment S. armata shows considerable 
resemblance to 8S. lata Brooks from the Arafura Sea, and like 
that species it shows curved lines on the telson on each side of 
the median carina; it has, however, a well marked spine on the 
basal joint of the uropoda, and the teeth on the inner margin 
of the outer prolongation of the uropods are represented by faint 
serrations only instead of by sharp teeth increasing in length 
distally as in S. lata: that species has only seven teeth on the 
posterior margin between the sub-median and the lateral spines 
and the dactyl of the raptorial limb bears only six teeth. 
I had written the paragraph above before I noticed that 
Squilla armata had been fully redescribed by Bigelow from 
specimens obtained off the coast of Patagonia, and that he had 
also pointed out the similarity of the posterior margin of the 
telson to that of S. lata. 
(5) Miers, Survey of H.M.S. ‘“‘ Alert,’? P.Z.S., 1981, p. 75, pl. vii., fig. 8. 
