4o4 



division, and having the last segment smaller than the preceding one. Caudal 

 rami comparatively short, being scarcely longer than they are broad, and of a 

 somewhat unusual form, each exhibiting dorsally a rectangular prominence, best 

 seen in the lateral aspect of the animal ; apical setae slender, though scarcely as 

 long as in the preceding species. Anterior antennae slender and narrow, exceeding 

 in length the cephalic segment, and, as in the preceding species, composed of 

 9 well-defined joints, 2nd joint much the largest and subfusiform in shape, 3rd joint 

 considerably longer than 4th, terminal part exceeding in length those two joints 

 combined. Outer ramus of posterior antennae resembling in shape that in the pre- 

 ceding species, being distinctly biarticulate, with the proximal joint conspicuously 

 dilated in the middle. Oial parts scarcely differing in structure from those in 

 that species. 1st pair of legs with the outer ramus a little shorter than the 1st 

 joint of the inner, the latter joint not quite twice as long as the other 2 combined. 

 The 3 succeeding pairs of legs of same structure as in the other species of this 

 genus. Last pair of legs with the distal joint oval conical in form, inner edge 

 bulging considerably at the base, tip somewhat obliquely truncated and, as in the 

 preceding species, provided with 6 setae, 2 of which are hair-like ; inner expansion 

 of proximal joint not extending to the middle of the distal joint, and carrying on 

 the obtusely truncated extremity 5 spiniform setae, the outermost one very short, 

 that succeeding it much the longest. 



Colour whitish, pellucid. 



Length of adult female 0.70 mm. 



Remarks. On account of a certain resemblance in the shape of the caudal 

 rami, I was at first inclined to identify this form with Ameira exilis of Scott. 

 On a closer comparison, I find however that such an identification is untenable. 

 Ameira exilis is of much larger size, attaining, according to Scott, a length of 

 1.40 mm.; and the structure of both pairs of antennae, mandibles and last pair 

 of legs seems also, according to the figures given by Th. Scott, to differ con- 

 spicuously in these 2 forms. The specific name here proposed refers to the 

 peculiar shape of the caudal rami, whereby the present species is at once recognised 

 from any of the others. 



Occurrence. Some few specimens of this form were found in the same 

 place in which the preceding species occurred. 



Ameiropsis abbreviata, G. 0. Sars, n. sp. 



(Suppl. PI. 33). 



Specific Characters. Female. Body unusually short and stout, sub- 

 depressed, with all the segments sharply marked off from each other. Cephalic 



