420 Proceedings of Boyal Soeiety of Edinhurgh. [july 2, 
flagellum is slightly elongated, but not articulate — measures only 
5 mm. in length, while adults of BoreopTiausia are 25 mm. long, 
and those of Nyctiplianes 50 mm. or more. 
It will thus be seen that a large number of ecdyses must take place 
before the adult stage is reached. We have specimens of the majority 
of these, and in our full paper hope to give descriptions of the advance 
at each moult, and figures of the development of the appendages. 
Our results give for the first time an account of one almost com- 
plete series of moults for one species, and is of further interest as 
none of the species observed by us were obtained during the 
“ Challenger” Expedition. 
In their metamorphosis the Euphausiidse stand almost alone, 
and none of the later larval stages are identical with the Zoea and 
other larvae of Decapods. They commence their larval life in the 
Nauplius condition, a type of larva frequent in other groups, parti- 
cularly amongst the Copepods, Cirripedes, some Decapods, and 
various parasitic forms. The larval function of the antennae is 
retained until the commencement of the Cyrtopia stage, a feature 
which is not usual amongst the Crustacea. The Calyptopis stage, 
in which the compound eyes while undergoing development are 
covered by an anterior expansion of the carapace, is a remarkable 
one, which, so far as we know, is only met with in one other group, 
an aberrant section of the Decapods, including Lucifer^ &c., where 
this condition obtains in the Protozoea stage. 
4. Notes on a Lucifer-like Decapod Larva from the 
"West Coast of Scotland. By George Brook, Lecturer 
on Comparative Embryology in the University of Edinhurgh. 
Whilst examining my “ tow-nettings ” from the West Coast, I 
have met with a peculiar Decapod larva, which, so far as I know, is 
unlike anything previously described. In general appearance it is 
very like semi-adult forms of Lucifer^ having an elongated “ neck,” 
at the tip of which the eyes and antennae are carried. My speci- 
mens were obtained from two localities — 1st, about half a dozen at 
about the same stage, from tow-nettings taken in Machrie Bay (west 
shore of Arran), 17th September 1886; and 2nd, about 20 speci- 
mens, some fiirther advanced than those of the previous gathering. 
