LEPTOCHELIA. EDWARDSII. 135 



antenna3 are about half the lengtli of the animal, and 

 consist of one long basal joint exceeding one-third of the 

 whole length of the organ ; the second is scarcely half the 

 length of the first, and is followed by a series of eight 

 small joints, each succeeding one being shorter than the 

 preceding. These eight small articuli are furnished on 

 the under side with bundles of those membranous hairs 

 which we have generally considered as being connected 

 with the acoustic apparatus, and therefore named auditory 

 cilia, but which Dr. V. Herisen, who has given much 

 attention to the subject, considers as having nothing to 

 do with the sense of hearing. The two basal joints of 

 this organ have not these appendages, hence we think 

 that they alone represent the three joints of the normal 

 peduncle. The inferior pair of antennas are very short, 

 reaching but little beyond half the length of the basal 

 joint of the superior pair. They are small, slender, and 

 feeble organs, generally directed obliquely downwards, 

 and consist of five joints, the first two of which are 

 robust and short, the two succeeding long and slender ; 

 the apical one minute and rudimentary. They are fur- 

 nished with a few long slender hairs. The first pair 

 of gnathopoda are large, strong, very long, being about 

 two-thirds the length of the entire animal, and reaching 

 beyond the extremity of the antennae ; the three basal 

 joints appear to be without the power of articulation, 

 which exists most freely between the meros and the 

 carpus ; the carpus reaches quite to the extremity of 

 the basal joint of the superior antennas ; the propodos is 

 longer than the carpus, and with the dactylos forms a 

 large, gaping, pincer-like claw ; the infero-digital process 

 of the hand is curved, and armed with two strong tuber- 

 cular teeth ; the dactylos is also curved and feebly 

 serrated, a minute hair springing from the anterior 



