IQ G. O. Sårs. 



Male much smaller than female, and having the dorsal 

 face less vaulted. Caudal part gradually tapered distally, 

 with the supra-anal angle obsolete and the terminal claws 

 much reduced in size. 



Colour. — Body pellucid, with a fainte yellowish tinge. 



Length of adult female 0-36 m"^, of male 028 ™"\ 



Remarks. — This new species is chiefly characterised 

 by the verj'' coarse, ridge-like longitudinal striæ of the cara- 

 pace, which are more prominent than in any other species 

 known to me. Otherwise it comes very near to A. rectangula 

 G. O.Sars and some other species grouping themselves arovmd 

 this form. 



Occurrence. — Raised in considerable number in some 

 of my aquaria prepared with mud from Sumatra. 



19. Pseiidaloiia longirostris (Daday). 



Occurrence. — Some few specimens of this form were 

 picked up from the sample taken by Mr. Iversen at the 

 Helvetic Estate, Sumatra. 



Distribution. — Ceylon [Daday), Brazil (the presei;it 

 author). 



COPEFODA. 



FAM. DIAPTOMIDÆi. 



1. Diaptomus orieiitalis, Brady. 

 Occurrence. — Some few specimens of this form, ex- 

 actly agreeing with those raised by the present author from 

 Australian mud, developed in one of my aquaria prepared 



