1898-1902. No. 18.] CRUSTACEA. 19 



81. Zaus spinatus, GOODSIK. 



This form also occurred in i different bottles. The specimens 

 agreed, perfectly, both in size and in their structural details with the 

 form occurring off the Norwegian coast. 



82. Zaus Aurelii, POPPE. 



(Pi. II, figs. 1-6). 



Zaus Aurelii, POPPE, Ueber die von Herrn Dr. ARTHUR and AUREL KRAUSE 

 im nordlichen stillen Ocean and Behringsmeer gesammelten Copepoden. 

 Arch. f. Naturgesch. 50. Jahrg. 1. Vol. p. 286, PI. XX, figs. 7-9, PI. XXI, 

 figs. 5-15. 



Specific Characters. Female. Body somewhat less ex- 

 panded than in the type species, the anterior division being oblong 

 oval in form, with the cephalic segment evenly rounded in front. 

 Rostral projection semicircular, deflexed. Urosome, as in the type 

 species, much narrower than the anterior division, lateral expansions 

 of the segments not much produced. Anterior antennae comparatively 

 shorter than in Z. spinalus, otherwise of a very similar structure. 

 Posterior antennas and oral parts as in that species. 1st pair of legs 

 with the rami. comparatively less robust, and the apical claws less 

 thickly clothed with cilia. Natatory legs likewise somewhat more 

 slender in shape. Last pair of legs with the distal joint oblong in 

 form, more than twice as long as it is broad, and somewhat tapered 

 at the end, inner expansion of proximal joint triangularly produced. 

 Ovisac oblong oval in form, with only a limited number of ova. 



Length of adult female 0.72 mm. 



.Remarks. - This form is closely related to Z. spinatus GOODSIR, 

 but is of considerably larger size, and has the anterior division of the 

 body somewhat less expanded. The several appendages are on the 

 whole very similar to those in the type species, though on a closer 

 comparison, some slight differences may be found to occur. The last 

 pair of legs especially differ conspicuously in the narrower shape of 

 the distal joint and the more produced inner expansion of the proxi- 

 mal joint. 



Occurrence. Some specimens of this form were found together 

 with the preceding species in 3 of the bottles. 



Distribution. -- The Pacific in lat. 55 56' N, long. 154 7' W, 

 on Laminaria and Macrocystis floating at the surface (POPPE); Novaja 

 Semlja (SCOTT). 



