V.CA IV 



Ij fused, and thai these two joinl 11 separated in Neba- 



rally admitted thai the Nebaliaeea are more related to the Mysidacea 



■ i- known thai in Mysidacea and Isopoda Asellota the -- \ 1 1 1 ] »< »* 1 oi 



ind thai the exopod is more 01 less developed, Furthermore thai beyond the 



the endopod are very different in aspect from the flagellum, so thai in the 



with th< "i squama much reduced the peduncle oi the antenna 1 onsists oi 6 distini t joints. 



thai tlu- same parts are found in Nebalia. What the authors considered to be the iir-1 joinl 



two well separated joints (fig ioa, / and 2), the firsl being in Nebalia well chitinized on mosl 



ind separated from the second by a narrow membrane. Near the end oi the lowei margin 



iird joint in Nebalia is on the outer side an insignificant, low elevation, but in Nebaliella antarctica i- 



gured by Thiele in oblong protuberance, which in my young specimen is well marked 



•■ linlj is the reduced squama; in several Asellota the squama is also quite small .mci oi similai 



shape. At the end of third joinl the fourth is represented by a transverse, movable, well chitinized plate 



also in Mysidacea and Asellota this joinl is short. Fifth and sixth joints are, as already said, 



fused in Nebalia, well separated in Nebaliella and Nebaliopsis. 



The Maxillula (fig. to b) are rather easy to investigate. Each consists of a proximal broad part. 



thesympod, and an extremely long"palp", the endopod. The sympod consists of 3 joints; firsl (i and third 



ich with a lobe on the inner side, while second joint (2) has none, completely as in Mysidacea, 



The chitinized elements of joints and lobes arc seen in fig to b; the membranous -kin between 



them hi ish shading. An exopod is wanting in this ordci 



The Max ilk consisl of a sympod with a 2-jointed endopod and an unjoin ted exopod. 



Tlie sympod consists in other orders of Malacostraca oi ; most frequently well separated joints, with a lobe, 



frequently bifid, from second and from third joint, but never any lobe from first joint. In Nebalia the 



plate of first joinl 1 is united with thai of second joint, as there is no distinct line between them; the 



from second joint 1/-1 has its chitine bipartite, while the lobe from third joint (/ 3 ) is only bifid. 



The thoracic Legs fig. tod). Only sympod and endopod need to be mentioned. The sympod 



1 authors oh 2 joints, bu1 it is in realitj 3-jointed. The first joint can lie seen by a strong 



ket-lens in a Nebalia, when the carapace is taken away and the epipods pushed aside; the joint is short, 



hut its outer sjd,- j> well chitinized and well marked off both from the following joint with the epipod and 



• ■I the segment; seen from ln-hind this joint (fig. tod, 1) is a transverse triangle Second 



join' t kind oi low lobe on the inner side, and this lobe is always distinctly clett rather little behind 



the distal end. As to third joint (3) it is difficult to decide whi inmates and the endopod begins. In 



nit 5 joints in the endopod, the two or three most distal marked off by a line 



tween the more proximal joints this line is distinct only towards the inner margin. 



- I counted with certainty (> joints (fig tod); the sympod was then considerably 



litional, rimal transverse line is visible near the inner margin and situated opposite 



In the penultimate legs ,,| Paranebalia I found features verj valuable for 



tandii the inn in oi the narrow endopod of the leg lice verj small, narrow and 



VOL 



^o- 



