387 



In the structural details also several well-marked differences from the other known 

 species are found to exist. 



Occurrence. Some specimens of this form, all of the female sex, were 

 found in samples taken last summer at Korshavn, south coast of Norway, from 

 depths ranging from 20 to 40 fathoms, coarse sandy bottom. 



Amphiascus bulbifer, G. 0. Sars, n. sp. 



(Suppl PI. 21, tig. 2). 



Specific Characters. Female. Body somewhat less slender than in the 

 last species and slightly tapered behind. Rostrum not much produced and some- 

 what obtuse at the tip. Urosome almost as long as the anterior division and 

 having the segments sharply marked off from each other, last segment well 

 developed and only slightly shorter than the preceding one. Caudal rami com- 

 paratively large and broad, quadrangular in form, apical setae exhibiting rather an 

 anomalous appearance, the outer medial one being comparatively short, but forming 

 at the base a large bulbous dilatation coarsely ciliated in its outer part on both 

 sides and abruptly narrowed to a thin hair-like bristle, inner medial seta very 

 slender and not at all thickened at the base, nor exhibiting any trace of the 

 usual joint, seta of inner corner small, that of outer corner coarse, spiniform. 

 Anterior antennae unusually short and stout, and only composed of 6 joints, the 

 2nd being much the largest and together with the 1st occupying half the length 

 of the antenna, 4th joint scarcely longer than 3rd but considerably expanded in 

 front, terminal part only consisting of 2 joints, the distal one much the longer. 

 Posterior antennae with the middle joint of the outer ramus well defined and seti- 

 ferous. Mandibular palp with the outer ramus very small, nodiform. Posterior 

 maxillipeds less strongly built than in the last species. 1st pair of legs with the 

 outer ramus about the length of the first 2 joints of the inner combined, middle 

 joint without any seta inside, last joint somewhat longer and armed with 2 simple 

 spines and 2 geniculate seta?; inner ramus with the 1st joint somewhat dilated 

 and shorter than usual, carrying, like the middle one, near the end inside a well 

 developed ciliated seta, last joint nearly twice as long as the middle one and 

 armed on the tip with a rather strong claw-like spine, a slender seta, and inside 

 the latter with a small bristle; both joints combined considerably exceeding the 

 length of the 1st joint. Natatory legs slender, with the number of setae con- 

 siderably reduced. Last pair of legs comparatively small, distal joint of incon- 

 siderable size and rounded form, carrying 5 rather unequal setae ; inner expansion 



