70 CARL BOYALLIUS, THE OXYCEPHALIDS. 



The last coalesced ural segment is about as long as the telson. 

 The telson is rounded at the apex, and reaches quite to the 

 apex of the last pair of uropoda. 



Syn. 1887. Tullbergella cuspidata, C. BOVALLIUS. 35, p. 38. 



Tullbergella cuspidata is probably the stoutest and most 

 robust of all the Oxycephalids. The integument of the body is thicker 

 and harder than in the other representatives of the family, Slebbingella 

 Theeli perhaps excepted. The form of the rostrum shows, as mentioned 

 above, some tendency towards the wing-like projections)) so enormously 

 developed in the genus Calamorltynchus. 



The head (p. 20, fig. I and p. 23, fig. 12) is somewhat longer 

 than the first four personal segments together, and is scarcely longer 

 in the male than in the female. The ocular region forms on each 

 side a large hemispherical intumescence, which stands out globularly 

 from the surface of the head. The hindest portion of the head 

 shows a feeble constriction, but does not form a neck. The rostrum 

 is very broad at the base, with almost parallel, and somewhat bulging 

 sides for about half its length; the distal half of the rostrum is 

 triangular with the apex sharp-pointed. This shape of rostrum forms a 

 transition from that in Oxycephalus to the extremely dilated rostral por- 

 tion of the head in Calamorhynchus. 



The eyes (p. 23, fig. 12) are separated from one another by a com- 

 paratively broad strip at the crown of the head. 



The first pair of antennce in the male (p. 25, fig. 18). are very 

 thick and robust; the first joint of the flagellum is scarcely more than 

 a third longer than it is broad at the base; the three following joints 

 together are much shorter than the breadth of the first joint; the second 

 flagellar joint is much thicker than, and about twice as long as, the third; 

 the fourth is slender, and nearly as long as the second. In the female 

 the first pair (fig. 23) are more curved than in the preceding genus; the 

 flagellum consists of three joints; the first is twice as broad at the base 

 as at the apex, and a little shorter than the two following joints together. 

 The second pair in the male (p. 26, fig. 27) have the first joint shorter 

 than half the second, the third a trifle longer than the second, the fourth 

 considerably shorter than the third, and the last or fifth joint very short, 

 scarcely equalling one-twentieth of the length of the fourth. All the 

 joints are closely fringed with short hairs along the under margins. 



