172 



and the 1st pair of legs; and it ought perhaps more properly to be referred to 

 the genus Pseudodiosaccus recently established by Th. Scott. The oral parts, 

 however, which in this genus are said to be built upon the same type as in 

 Diosaccus, are quite normal in the present species, and the inner ramus of the 4th 

 pair of legs is composed of 3 well-defined joints. 



Occurrence. Only 2 female specimens of this form have hitherto come 

 under my notice. They were found in a sample taken at Kopervik, on the west 

 coast of Norway. 1 ) 



112. Amphiascus phyllopus, Gr. 0. Sars, n. sp. 



(PI. CXIII). 



Specific Characters. Female. Body comparatively short and stout, only 

 slightly tapered behind. Cephalic segment rather large, fully as long as the 4 

 succeeding segments combined, and obtusely rounded in front; rostrum prominent, 

 obtusely acuminate at the tip. Urosome not much shorter than the anterior di- 

 vision, segments sharply defined and coarsely spinulose at the hind edge ventrally 

 and laterally, genital segment large, quadrangular, imperfectly divided in the 

 middle, last segment somewhat shorter than the preceding one. Caudal rami 

 comparatively large, quadrangular in form, being nearly as long as they are 

 broad, middle apical setae rather elongated and somewhat thickened in their 

 proximal part. Anterior antennae unusually short, 8-articulate, the first 4 joints 

 gradually diminishing in size, terminal part about half the length of the prox- 

 imal. Posterior antennae with the outer ramus about the length of the terminal 

 joint of the inner, middle joint very small and imperfectly defined, without any 

 seta. 1st pair of legs rather strongly built, outer ramus much shorter than the 

 1st joint of the inner, the middle joint being much the largest, with a small seta 

 at the end inside, last joint small, rounded, with 4 strong claw-like spines and 

 a slender seta on the inner side; outer 2 joints of inner ramus very short, the 

 last one armed at the tip with 2 strong claws of unequal length. Natatory legs 

 well developed, with the rami rather broad and exhibiting the full number oi 

 setae. Last pair of legs very large, foliaceous, distal joint of unusual size, forming 

 a broadly oval lamella fringed with 6 marginal setae of rather unequal length: 

 inner expansion of proximal joint very broad, but scarcely extending to the middle 

 of the distal joint, marginal setae 5 in number, the outermost one very small, 

 the 3rd much longer than the others. Ovisacs of moderate size. 



x ) Found this summer rather abundantly at Farsund, south coast of Norway, in t 

 depth of about 20 fathoms, muddy sand. 



