— 21 — 



Endopod of the uropods a little shorter than telson, very slightly 

 or scarcely shorter than the exopod. — The aberrant maxillulae 

 are shown in flg. 19; the essential différences between thèse 



Fig. 19.— Left maxillula of same spéci- 

 men, from below. 1. first joint; /.' lobe 

 from first joint ; pl. 1 plate originating 

 from first lobe, situated on the lower 

 side of the appendage and directed 

 outwards ; 2. second joint, 3. third 

 joint, the majority of which is covered 

 by the plate mentioned ; /. 3 lobe from 

 third joint ;4. fourth joint, the palp (i). 



appendages and the maxillulae of several other species have been 

 pointed out above in the analytical conspectus. — Length of the 

 largest female spécimen 44 mm ; maie unknown. 

 Locality. — Stat. 1768, 3 spécimens. 



(1) This interprétation has already been set forth by me in a morpho- 

 logical paper in « Zoologischer Anzeiger » 1893. Sars, Claus, Boas, Chun 

 consider the plate from the lobe of first joint as the exopod, but this very 

 incorrect opinion arose from the fact that thèse authors used the usual easy 

 method: to remove such mouth-parts more or less near their origin, put 

 them under the compound microscope, draw the outlines and interpret the 

 protubérant lamellar part according to the aspect of the outline. But if we 

 shall arrive at correct interprétations of mouth-parts their constituting 

 chitinous éléments must be looked for; it is necessary to remove thèse 

 appendages by cautious dissection from the skeleton of the head, and then 

 to remove muscles etc. from their internai cavity in order to be able to see 

 their real joints and the origin of the lobes. When the well-chitinized 

 maxillula of a large species of this order is examined in this way, it is not 

 difficult to ascertain that the inner, first, lobe originates from the first joint, 

 that the second short joint has no lobe, that the distal lobe projects from 

 third joint — the same structure is found in Mysidacea, Isopoda, Amphipoda, 

 etc. — and that the plate interpreted by the authors mentioned as the 



(30) 



