24 
Dr. Baird on the genus Cypridiiia. 
notched at the superior part. The animal, besides several organs 
which he shortly describes, had, he remarks, a large foot armed 
with a toothed talon resembling that of the puce d’eau, and de- 
stined for the same uses, being a kind of rudder which enables 
the insect to move about with swiftness.^^ An officer on board 
made several sketches of this interesting little creature, and from 
these and the above description I have little doubt of its belong- 
ing to this genus*. Biville does not mention the size of his in- 
sects, but from what he says they must have been much smaller 
than the species above described. Amongst the very interesting 
drawings of Crustacea made by Mr. Adams during the voyage of 
the ^Samarang^, there is one which appears to be another species 
of this genus. It was taken in the Sooloo Sea. Mr. Adams de- 
scribes it as of a bluish colour, semi-opake, two lines in diameter, 
and very quick in its motions, darting about with great velocity 
and constantly revolving. The figure however is not sufficiently 
detailed to enable me to describe the species, and no specimens 
were brought home. Mr. Adams observed both of these species 
to be highly luminous. 
British Museum, October 1847. 
Postscript. 
Since the above was in type I have had an opportunity of ex- 
amining another specimen of the Cypridina Adamsi, kindly placed 
in my hands by Mr. Adams. Though equally dry as the other 
specimens I had previously received from the same gentleman, 
the body of the animal was almost entire, and I was thus enabled 
to make out the anatomy more satisfactorily. The eyes are two 
in number; each placed upon a conical lengthened peduncle, 
which takes its origin near the base of the first pair of the pedi- 
form antennae. Prom the state of the animal I could not 
distinctly make out the construction of the organ, but apparently 
it was composed of numerous crystalline lenses. The oviferous 
feet, placed on each side of the body and directed upwards, 
consist each of a long cylindrical body, club-shaped, composed 
of a great number of short articulations, and furnished with 
many stout barbed spines arising from each side. The articu- 
lations are completely circular, and with a high power can be 
discerned running round the body of the foot like a bell-wire 
(fig. 4 a ) . The spines on its edges are composed of a long basal 
joint, smooth for three-fourths of its entire length, and five or six 
very short articulations at the apex, each armed with a short awn- 
like seta on either side (fig. 4 b). The secondpair of antennae (fig. 5) 
are each formed of three joints. The basal is stout and fieshy, 
and has at its posterior extremity an appendage consisting of a 
* Muller however quotes it as resembling his Lynceiis Irachyurusl 
