lamelliform, being coarsely denticulate both at the edge and the outer face, mar- 

 ginal setse very delicate, and only 3 in number. 



Male resembling that of the preceding species, but somewhat more slender 

 in form. 



Body in both sexes of a pale yellow colour, with a broad transverse 

 band of a rich crimson across the back, occupying the dorsal parts of the first 

 3 free segments of metasome. 



Length of adult female 0.80 mm., of male 0.60 mm. 



Remarks. This is unquestionably the species originally described by Nor- 

 man from the Shetland Isles under the above name. His statements about the 

 colour of the animal 1 ) leave no doubt as to the correctness of this assumption. 

 Though very nearly related to the preceding species, this form may be easily 

 distinguished by the less robust body, but especially by the uniform appearance 

 of the epimeral plates. The form of the last pair of legs in the female is also 

 conspicuously different, and, as above stated, the colour of the body is very 

 characteristic. 



Occurrence. I have found this form not unfrequently in several places 

 on the west coast of Norway, as also in the Trondhjem Fjord. It occurs only in 

 depths varying from 6 to 20 fathoms, generally on Laminaria saccharine^ but also 

 on other algse, and never in the littoral zone. 



Distribiition. Shetland Isles (Norman). 



Gen. 22. Psamathe, Phillppi, 1840. 



Syn: Scutellidium, Clans. 



Generic Characters. Anterior division of body somewhat depressed, though 

 scarcely clypeiform, and without any hyaline rim at the edges. Rostral projection 

 obtuse, not lamellar, nor distinctly defined at the base. Epimeral plates of the 

 first 3 free segments of metasome discontiguous at the tips, not imbricate. Last 

 segment of metasome freely exposed behind, very small, and without any distinct 

 epimeral plates. Urosome more or less elongated, and slightly dilated in its 

 anterior part. Caudal rami well developed, though rather short, apical setse 

 slender and somewhat divergent. Eye normally developed. Anterior antennae 



*) "Colour pale, with a ruby-coloured fascia on the 2nd and 3rd, or 2nd, 3rd, and 4t 

 segments of cephalothorax." (Norman). 



