studies on marine Oslracods 347 



Penis: — This is constructed according to the t}^e that is characteristic for this sub- 

 family. For details see the accompanying figures 23 and 24. 



F u r c a (fig. 25) : — This has six claws, the five posterior ones decreasing fairly uniformly 

 and strongly in length and strength the more proximally they are situated. All the claws are 

 well defined from the lamella except no. 2, which is entirely united to this. Proximally of the 

 claws the furca is smooth. 



Upper lip (fig. 26) : — The unpaired upper glandular field is rather large and has 

 numerous pegs of about equal size (= the mouths of the glands). The two paired ventral ones 

 are moderately large. The fang-like processes on which the latter are situated issue dorsally 

 from two rather large, wing-like processes, which are cut transversally off distally and there 

 {ventrally of the fang-like processes) coarsely serrated, having about twelve or thirteen teeth. 

 (It is to be observed that no glands have their mouths on these teeth.) The outside of the fang-like 

 processes has a dense longitudinal row of bristles at about the middle. These bristles hang 

 down like drapery; the proximal ones of them are about as long as the height of the processes 

 proximally, rather broad proximally, narrowing distally and most frequently split at this part; 

 the others decrease in length and breadth the more distally they are situated on the processes. 

 Ventrally the fang-like processes are furnished thickly with fine more or less short hairs and 

 dorsally they have groups of short, stiff hairs as well. The upper lip has groups of short, 

 stiff hairs proximo-ventrally as well. The protuberance dorsally of the upper lip is small. 



The rod-shaped organ (fig. 11) is very short and thick, somewhat drawn in 

 distally, so as to seem sharply truncated with a small projecting distal knob, the point of the organ. 



The lateral eyes are very large. 



The back of the body has strong transverse folds. 



No female is known. 



Remarks: — Even with regard to the shell this species is distinguished so markedly from Differences from 

 the other species of this sub-genus that there is no danger of any confusion. In the case of ^'' "P'"^"- 



none of the species M. (C.) favus, M. (C.) Bairdi and M. (C.) asymmetrica is there information 

 of any shell longer than 3 mm., while the species described above is no less than 5,5 mm. long. 

 The shape and sculpture of the shells are also very different. 



The relationship between these species is impossible to decide because of the incompleteness Relaiionship of tlie 

 of preceding descriptions. 



Habitat: — Australia: 



Cape Jaubert (type locality); depth: 2.") m.; 13. \'IT. 1911: one mature male 

 (coll. E. Mjoberg). 



species. 



