SCHIZOPODA AXP CUMACEA i5 



Remarks. — A. maxitna is a little longer and more robust than A. Ohlinii, but the 

 two species agrée closely with each other in most structural features. I hâve found two good 

 différences between them. In A. maxiina the eye-stalks and eyes are considerably depressed, 

 the eyes look essentially forwards, occupying not only the front end but the major part or 

 nearly the whole outer margin of the stalk, so that the inner margin of the stalk itself is 

 much or generally several times longer than the outer free margin behind the eye; finally, 

 the front latéral margin of the carapace is in the main vertical, so that its lower prominent 

 rounded angle lies scarcely behind the insertion of the eye-stalks. In A. Ohlinii the eye-stalks 

 and e3 r es are feebly depressed; the eyes look essentially forwards, the free outer margin of 

 the eye-stalk being about as long as the inner margin ; finally, the front latéral margin of 

 the carapace is in the main extremely oblique, so that its lower prominent rounded angle 

 lies much behind the insertion of the eye-stalks. 



III. - The Order CUMACEA 



Of this order three spécimens belonging to three différent species were captured. But one 

 of the spécimens has the carapace very broken and besides it seems to be far from adult; for 

 thèse reasons it became necessary to abandon every idea of giving a description of this form 

 which cannot be referred to any antarctic species hitherto known. The two other spécimens are 

 described hère as représentatives for two species new to science. 



i. — Cyclaspis glacialis n. sp. 



(PI. III, fi S s. i a—ig 



The spécimen is a well developed female, but having no marsupium it is not adult ; it 

 measures io.3 mm. in length. It shows some resemblance to C. aicstralis G. O. S., but differs 

 especially in lacking the latéral carina on the carapace and the sub-dorsal pair of carinae on the 

 three posterior cephalothoracic and the two anterior abdominal segments. 



Carapace slightly more than one-third of the total length, somewhat compressed ; its 

 vertical height is a little more than three-fourths of the length. It is dorsally keeled ; in the 

 anterior three-fifths this keel is broad and in the main rounded, but besides it has a secondary 

 extremelv narrow, low but distinct carina in the middle Une (fig. i b) ; in the posterior three- 

 fifths of the carapace the main keel is slightly developed and without secondary carina. Each 

 half of the dorsal surface of the anterior three-fifths of the carapace is somewhat excavated, and 

 an oblong moderately arched area occupies the submedian part of each excavation ; it is the 

 existence of this pair of excavations which produces the aspect that the anterior part of the 

 carapace is broadly keeled. The ocular lobe is moderately broad and scarcely prominent above ; 

 eye-facets can not be perceived. The pseudorostral lobes touch one another just in front of the 

 eye-lobe which reaches nearly to the front end. The antennal notch is shallow, moderately open; 

 the tooth nearly acute. 



First leg-bearing segment entirely concealed; second dorsally shaped as the posterior 

 part of the carapace ; third and fourth segments without any keel ; fifth segment with a narrow, 

 well developed carina. 



