24 Dr. Baird on the genus Cypridina. 



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*. Rivillc 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 v.ery 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. From 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 antenna? (fig. 5) 

 are each formed of three joints. The basal is stout and fleshy, 

 and has at its posterior extremity an appendage consisting of a 



* Muller however quotes it as resembling his Lyncem brachyurusl 



