10 G. O. Sårs. 



Occurrence and Habits. — This form developed rather 

 abundantly in one of my aquaria prepared with mud from 

 Sumatra, and was watched during several successive gene- 

 rations. The specimens kept themselves, as a rule, in the 

 uppermost part of the aquarium, moving slowly about, the 

 belly constantly turned upwards and generally in imme- 

 diate contact with the surface. At the close of the season 

 the greater number of the specimens became provided with 

 ephippia, and at the same time the very small males were 

 often observed. Some few specimen of the present form 

 were also picked up from the sample taken by Mr. Iversen. 



Distribution. — Australia {King), Cape of Good Hope 

 (coll. of Dr. Pnrcell). 



5. Ceriodaplinia Rigaudi, Rich. 



Occurrence. — This form also w^as raised in con- 

 siderable number from the same parcel of mud that yelded 

 the preceeding species, and was also found occasionally in 

 the above-mentioned sample. 



Distribution. — Tonkin [Richard), Palestine (idem), Cey- 

 lon [Daday), Knysna, Cape Colony (the present author), Brazil 

 (idem). 



6. Moiua brevicornis, G. O. Sars, n. sp. 



(PI. I, figs. 3, 3 a— b). 



Specific Characters. — Female. Head compara- 

 tively large and somewhat procumbent, with a slight supra- 

 ocular sinus, frontal part obtusely rounded, ventral margin 

 evenly convex, cervical depression well marked. Carapace, 

 seen laterally, rounded quadrangular in outline, with the 

 hind edges distinctly insinuated above the middle, dorsal 

 part in gravid specimens, as usual, more or less globularly 



