ANONYX IIOLBOLL1. 105 



which we have seen, the outline has been scarcely as 

 defined as that given in pur figure. In Kroyer's beau- 

 tiful plates in his " Voyage en Scandinavie," the form 

 is given as wedge-shaped, slightly curved, the narrow 

 extremity being uppermost, and the broadest down- 

 wards, like an inverted comma ('). The upper antennae 

 have the first joint of the peduncle very long and stout, 

 while the second is short and much narrower ; the third 

 being scarcely visible, a portion only of it extending 

 beyond the limits of the preceding ; the first articulus 

 of the flagellum is very long, as long as all the others 

 united, and is furnished upon the inner side with two 

 longitudinal series of transverse rows of short hairs. 

 It also supports at its extremity, upon the upper side, 

 a bundle of auditory cilia ; the rest of the flagellum 

 consists of but six or seven articuli : the secondary 

 appendage is long and slender ; it is nearly as long as 

 the flagellum, and consists of about eight articuli, of 

 which the first is the longest. 



The lower antennas are about one-fifth the length 

 of the animal, and as long again as those of the upper 

 pair ; the peduncle is shorter than that of the upper 

 antennae, and less stout ; the flagellum is long and slen- 

 der, and has the articuli, of which it is composed, 

 longer than broad. 



The mandibles are furnished with a plain cutting 

 incisive edge, from near the base of which a row of 

 minute curved hairs is continued, until they communi- 

 cate, at the opposite extremity, with the molar tubercle. 

 Each of these organs supports a very long three -jointed 

 appendage, the second and third joints of which are fur- 

 nished with hairs, increasing in length towards the distal 

 extremity of each joint. 



The foot-jaws have the scale-like plate belonging to 



