38 DR. R. V. WILLEMOES-SUHM ON SOME ATLANTIC 



Underneath the short rounded rostrum, between the eyes, there is a small tubercle 

 (fig. 1 a, x) which in the males is somewhat more prominent than in the females. 



The eyes have the same position as in Gnathophausia, and are 2 millims. in length. 

 They cover somewhat the first joint of the funiculus of the first antenna, which consists 

 of three joints, the last of which has a lateral prolongation (fig. 2). Between the third 

 joint and the insertion of the ftagella a small subjoint is to be seen. The external fla- 

 gellum is much bigger than the internal. Hairs are in both sexes at the inner side of 

 the funiculus, the size of which is also very much the same in both. The scale of the 

 second antenna is jointed and ovoid. The slender funiculus has three joints and a 

 flagellum, which exceeds in length the whole animal. 



The upper Up (fig. 11) is cordiform, with the point directed upwards. The mandibular 

 (fig. 4) are not particularly strong, and have a three-jointed palpus, the second joint of 

 which is somewhat bent backwards, and the third rounded at the top. 



The excision between the two pieces of the under lip (fig. 5) is not so deep as in Gna- 

 thophausia. On its anterior border we find the same hairs which may be seen in the 

 Lophogastridse. 



The first maxilla (fig. 6) has two manducatory processes : the upper one has many 

 strong teeth ; while the under one has only a few hairs, no denticulation. 



The second maxilla? (fig. 7) have a very elongated flagellum (fl) and a small two-jointed 

 palpus (p). 



The maxillipedes (fig. 8) have a very large palpus and a flagellum on their enlarged 

 basal joint. They are terminated by a small denticulated claw. 



The gnathopoda and the first pereiopod in this genus (which hitherto has not shown so 

 very great differences from Lophogaster) are not leg-like, but have all the shortened maxil- 

 lipedalform and function (figs. 1, 9, & 10). This is the same in both sexes. The branchige 

 and (in the female) the breeding-lamellae begin at the base of the first gnathopod. The 

 form of this appendage (fig. 9) can best be seen from the figure. The terminating claw is 

 not denticulated ; the second is somewhat longer than the first, but shows no peculiarities. 

 It is very astonishing that in both sexes of this genus the first pereiopod has the same 

 maxillipedal form and function as the gnathopoda. This is the case in no other Schizopod 

 family. Also the form of its various joints (fig. 10) is very much like that of the gnatho- 

 pod-joints. 



Among the four remaining pereiopods we have again two very different forms : three 

 of them are enormously elongated (figs. 1 & 12; they have a length of 27 millhns.) and 

 terminated by a strong and recurved claw, which has many spines at its inner side, 

 whereas the last pereiopod (fig. 1, p\ & fig. 13) does not end by a claw, but by a simple 

 rounded joint, is very much shorter than the three preceding leg-like pereiopods, and all 

 over covered with hairs. 



There are arborescent branchial at the base of all the gnathopoda and pereiopoda with 

 the exception of the last one. Each pair of branchiEe consists of three branches, two of 

 which are laterally covered by the carapace ; the third branch is bent inside between the 

 appendages, and is accordingly in free communication with the water. Id this respect 

 there is no difference between this genus and the Lophogastridse. 



