268 THE SCHIZOPODA. 



somewhat shorter than the inner margin of the lobe from third joint and twice 

 as long as broad. — Second pair of thoracic legs with fifth joint considerably 

 longer than the sixth. 



Abdomen without dorsal processes or teeth. Preanal spine simple in both 

 sexes. — Uropods slightly or scarcely overreaching the telson; the exopod 

 slightly longer than the endopod. — Telson has two longitudinal keels extremely 

 finely serrate along more than half of its length and with a very short and thin 

 seta at each saw-tooth. 



The copulatory organs (figs. 4c-4d) show some peculiarities. The spine- 

 shaped process (p'.) is somewhat small, well curved. The terminal process 

 (p.^) has the basal portion very much tliickened and from the outer side of 

 this part the process projects forwards, having the inner margin straight and 

 at some distance from the end suddenly bent somewhat inwards, while the 

 outer margin is convex and the terminal margin in the Pacific specimen 

 obliquely and deeply emarginate^; the major part of the process has a flat 

 expansion on the outer side and at the end it is peculiarly shaped, being curved 

 somewhat backwards, as may be seen by a comparison of fig. 4c with fig. 4d. 

 The proximal process has its proximal part very thick and directed forwards 

 and outwards (fig. 4c, p'\); then it bends abruptly and strongly inwards, is very 

 slender, very long, and at the middle curved in the opposite direction, while 

 the terminal, very thin part is curved semicircularly. The lateral process (p"*.) 

 is rather slender, with the cur\-ed distal part short. The additional process 

 (p''.) as in the other species of the genus consisting of an oblong and feebly curved 

 basal part, from the end of which projects an extremely thin distal portion 

 directed outwards and forming with the tliick part an acute angle. The median 

 lobe long and moderately narrow; the auxiliary lobe somewhat short; the 

 setiferous long, somewhat narrow, with setae along the distal part of the 

 inner margin and the major part of the outer margin. 



Length of the single adult male 21.5 mm., of a large female 21 mm. 



Remarks. — For comparison with the two following species the above 

 description may be useful. Caiman has given (in 1905) an excellent figure (jf 

 the animal; the only point with wliich I disagree is the position of the eye, 

 as I never found the groove dividing it into two so vertical areas, but at most 

 somewhat oblique and most frequently nearly horizontal. 



Distribution. — A^. boopis goes very far northwards in the Atlantic, as it 



' In a male from the Monaco collection the terminal margin is very oblique, badly defined from 

 the other margin and slightly incised. 



