F i r s t a n t c n n a: — The fifth and sixth joints, although still free, seem to show 

 a certain tendency to become joined to each other. The approximate proportions between 

 tlic joints are as follows: 



I %; 11 '|: III I; IV ': V I; YT |: VII |: VIII (».3. 



The most striking fact is perhaps the great reduction of the third joint; this joint has, however, 

 no marked tendency to become joined to the neighbouring joints. The posterior bristle of the 

 third joint and the postero-distal bristle of the fourth joint are about subequal and almost 

 completely reduced; their Ipngtli corresponds to about the breadth of the sensory bristle of 

 the fifth joint proximally. The anterior bristle of the third joint, the antero-distal bristle of 

 the fourth joint, the medial-distal bristle of the sixth joint and the a-bristle of the seventh joint 

 are all subequal, of about the total length of the fifth and sixth joints and have short, fine hairs. 

 The sensory bristle of the fifth joint is somewhat longer than the anterior side of the seven 

 distal joints (the proportion is about 57 : 50) and has eleven sensory filaments. The seven 

 proximal ones of these are fixed between about a third and a quarter of the distance along tlie 

 bristle, are rather thick and long, being about a third of the whole length of tlie bristle, and are 

 l)are. The three following ones are considerably shorter, about a fifth to a sixth of the total 

 length of the bristle, and narrow; tliey are furnished with a few, about one to three, weak second- 

 ary spines, and are separated from the others by a decided gap. The most distal of these 

 filaments is quite short and bare, and is fixed near the point of the bristle. Of the bristles on 

 the two distal joints the b-bristle is not cpiite as long as the five distal joints, and has four short 

 fihiments which are almost quite l^are; the f-bristle is about as long as the anterior side of the 

 seven distal joints and is cliaracterized by eight or nine filaments, the c- and g-bristles are 

 subequal and about a tliird longer than the last-mentioned one and have ten filaments. Some 

 of the proximal filaments on the three last- mentioned bristles, the c-, f- and g-bristles, have 

 a few (about one to four) short, weak secondary spines. The two simple sensory bristles d and 

 e are subequal and almost as long as the anterior side of the second joint. Pilosity: The second 

 joint is ratlier well furnished witli hairs, especially jiostero-distally; otherwise this limb is smooth. 

 Second antenna: — Protopodite: Length, about 0,6 mm. The medial- 

 distal bristle is relatively long, of about the same length as the longest of the bristles of the 

 first endopodite joint; it has short, fine hairs (fig. 10). The e x o p o d i t e (fig. 9) has about 

 the following proportions between the joints: 



I : II : III : IV : V : VI : VII : VIII : IX -- 30 : (i : 3 : 3 : 3 : 3 : 3 : 2 : 2. 



In other words the first joint is somewhat longer than the total length of all th(> following joints, 

 the second joint is about as long as the total length of the two following joints, the other joints 

 are subequal. The bristle of the second joint is about as long as or somewhat longer than the 

 total length of the eight distal joints; it is furnished ventrally witli a few — in the two cases 

 investigated there were eight — smooth, ]iowerful secondary spines, sparsely ])laced, and dorsally 

 it has a corresponding number of short, rather fine, bristles, situated opposite the ventral spines. 

 The proportion between the length of the longest natatory bristles and the whole exopodite 

 is ahout hve to three. The natatory bristles have broad natatory hairs placed close together. 



