201 
posterior extremity. The anterior extremity is rather narrower than 
the posterior ; the sinus or notch is rather deep, the beaks are sharp- 
pointed and thickened along the margins. The surface is marked 
with numerous, minute punctations, and is of a deep yellow or saf- 
fron colour. 
Length 3 lines; breadth 2 lines. 
Hab. Madras, in 8 fathoms. From the Collection of Mr. Cuming. 
Mus. Brit. ; 
In the ‘ Mémoires pour les Savans Etrangers,’ vol. iii. p. 269, there 
is an exceedingly interesting communication from M. le Comman- 
deur Godeheu de Riville on the luminosity of the sea. In that 
paper he describes and figures a little creature which he found was 
the cause of this luminous appearance. The body of the animal, he 
says, was contained in a small, transparent shell, resembling in form 
that of an almond cleft down the side, and which was notched at its 
upper part. This shell, though roughly figured, pretty accurately 
represents this species of Cypridina, and I have little doubt our 
species is the same as Riville there describes and figures. The part 
of the ocean where he met with it was off the coast of Malabar. 
3. Cypripina ovum, Baird. (Pl. LXXI. figs. 3, 3a, 3 4.) 
Carapace-valves of a perfect ovoid shape, and very ventricose. 
Anterior extremity slightly narrower than posterior. The surface of 
the valves is marked with exceedingly minute punctations, with nu- 
merous, round, quite smooth spots, of a browni8h-yellow colour, dis- 
tributed over it, appearing as if they were excavated out of the sur- 
face of the shell. The notch at the anterior extremity is rather 
deep ; the beaks are somewhat pointed, slightly incurved and thick- 
ened along the margins; and the posterior extremity is rounded 
without any appearance of gibbosity. 
Length 1} line; breadth 1+ line. 
Hab. Chinese Seas. Collected by Sir E. Belcher, C.B. From 
the Collection of Mr. Cuming. ; 
Mus. Brit® 
4. CyPRIDINA ALBO-MACULATA; Baird. (PI. LXXI. figs. 1, 1 a, 
12, le, 1d.) 
Carapace-valves of an ovate-ventricose form, rounded on the dorsal 
and yentral margins, and slightly, but distinctly, produced into a 
point in the centre of the inferior extremity. The surface is marked 
with numerous, small, distinct punctations, and conspicuously blotched 
with several large, bright white patches, which are slightly raised 
and strongly punctured. There are only two large ones on the right 
valve, and three on the left. The notch at the anterior extremity is 
rather deep, and the edges of the beak are incurved, pointed, and 
thickened along the margins. The anterior extremity is rather nar- 
rower than the posterior. 
Length 4 lines ; breadth 3 lines. 
Hab. Swan River. From the Collection of Mr. Cuming. 
Mus. Brit. 
