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siderably longer than the inner, and having the terminal joint well developed. 

 Last pair of legs rather narrow at the base, but considerably widening towards 

 the end, which is produced to a conical lappet, across the base of which 3 

 slender setae are attached; inner edge of the leg produced to a similar lappet, 

 which, however, is quite smooth. 



Male very unlike the female and of much smaller size, with the body 

 much shorter and stouter. Cephalic segment somewhat club-shaped, and 

 scarcely exceeding half the length of the body. Tail very narrow and com- 

 posed of 4 well defined segments, the 1st of which is produced below to a 

 rather large copulative appendage divided at the end into 2 diverging sub- 

 cylindrical rami. Caudal rami of much the same appearance as in female, 

 with the same number of setae. Eye still more largely developed than in 

 female, with the ventral lens rather prominent and highly refractive. Antennae 

 considerably exceeding half the length of the cephalic segment and distinctly 

 5-articulate, with the last very mobile joint abruptly attenuated distally. 



Body in the living animal rather pellucid, with a pale yellow hue, and 

 in some places dotted with a chestnut-coloured pigment. 



Length of adult female 3.80 mm., of male 2.10 mm. 



Remarks. This form was described in the year 1904 by Scott from 

 some female specimens taken in 2 different places of the Scottish coast. The 

 resemblance of this form to Monstrilla Dance Claparede, vindicated by Scott in 

 a note to his description, I find to be a very slight one. In fact the present form 

 is easily distinguishable both from this and from any other of the Monstrillidae. 



Occurrence. Two specimens only of this remarkable form, a female and 

 a male, have as yet come under my notice. They were captured, many 

 years ago, at Bejan, outside the Trondhjem Fjord, and coloured drawings of 

 both, when still alive, were immediately executed. 



Distribution. Scottish coast (Scott). 



