234 Proceedings of the Royal Society of Victoria. 



nous, curved evenly inwards, not at all angularly bent near the 

 tip, inner surface usually bearing transverse ridges. Frontal 

 appendages simple, spinulose, minute to very long and flexuose, 

 proximally coalescent and united to the frontal base of the 

 claspers. 



Second antennae in the female very long, flattened, flexuose, 

 apically tapering to a point ; in fully matured forms often extend- 

 ing as far back as the limit of the trunk. 



Branchial feet possessed with the usual parts ; covering 

 lamellae large ; exopodite large, broadly ovoid ; distal lobe of 

 endopodite well extended, ventral margin distinctly emarginated, 

 inner margin substraight, scarcely or not at all produced beyond 

 the level of the endites ; endites clearly marked oS" from the 

 stem. 



Ovisac large and stout, of pyriform shape, posteriorly tapei'ing 

 to a rather long neck. Eggs numerous, generally marked with 

 facets bordered by raised ridges. 



Male with a pair of penes, each lying introverted within a 

 simple unnotched sheath protruding a little from the segment ; 

 when everted, of subcylindrical shape, long and spinulose. 



Remarks. — This new genus is instituted to receive the two 

 following Branchipods. From Branchipus, with which they 

 accord closely in very many respects, they differ in the male 

 claspers being without any accessory branch or spine, and the 

 terminal joint not being at all angularly bent near the tip ; also 

 in the long and ribbon-like second antennae in the female, and 

 apparently in the peculiarly characterised penes of the male. 

 From Ohirocephalus, with which the second species might be 

 placed if we relied on the frontal appendages, there are other 

 differences of more generic importance which appear to separate 

 it from that genus. 



1. Branchinella austral iensis, Richters. 

 (Plate XXX.) 



Branchipus australiensis, Dr. F. Richters, Journal de Museum 

 Godeff"roy, xii., 1876, pp. 43, 44, pi. 3. 



Specific Characters. — Body stout, cephalon of about equal 

 length to the first four segments of trunk, trunk of equal length 



