1 & 11). The 3rd joint is somewhat shorter than the 2nd and 

 considerably dilated towards the end, which is obliquely trun- 

 cated, with the outer corner produced and finely denticulate. 

 At the inner edge this joint bears 2 slender setse, one of which 

 is attached about the middle, the other at a short distance 

 from the end. The last joint is very small, of conical shape 

 and forms with the preceding a distinct angle; there is no 

 trace of the usual hook, but it bears on the tip 3 very elongate 

 and slender setae, the middle of which is the longest 



The caudal rami (fig. 10) are very small, sublinear or only 

 slightly curved. The claws are rather slender, nearly of uniform 

 length and quite smooth, terminating in a line, setiform point. 

 A very small bristle is attached just in front of the apical claw, 

 and another more elongate seta originates from a distinct ledge 

 of the dorsal edge, a little below the middle. 



The copulative organs of the male (fig. 13) are compara- 

 tively small and on the whole constructed upon the same type 

 as in the male of Cyprinotus. In their details, however, they exhi- 

 bit well marked differences. Thus the inner plates are compara- 

 tively shorter and more rounded, having moreover their distal 

 parts sharply defined from the rest as two juxtaposed narrow 

 linguiform processes. The outer plates are likewise somewhat 

 different in shape, being almost securiform, with the inner cor- 

 ner much produced and acuminate. 



The ejaculatory tubes (fig. 14) are rather large and, as in 

 Cyprinotus, exhibit numerous (about 20) whorls of radiating 

 spines. Their distal extremity, or coronula, is however not as 

 in that genus truncate, but brought to a rather large cupuli- 

 form projection. 



Biological Observations. — Of the present species numerous 

 specimens were found, at the close of the summer 1884, in a 

 small aquary prepared the same year with mud from the Grace- 

 mere Lagoon, sent by Mr. Lumholtz. The specimens continued 

 to live during the whole winter, but disappeared before the 

 beginning of the next summer. All the specimens then observed 

 were females; but in 1886 I succeeded in securing 2 male 



