84 



the 2 succeeding segments finely ciliated; anal segment comparatively short and 

 deeply incised in the middle. Caudal rami about as long as they are broad and 

 transversely truncated at the tip, apical setse much elongated, the innermost but 

 one exceeding twice the length of the urosome. Anterior antennae rather robust 

 and densely setiferous, the first 3 joints rather large and inflated, 4th joint much 

 shorter and produced at the end anteriorly to a conical process carrying the 

 sensory filament, terminal part abruptly attenuated and not attaining half the 

 length of the proximal part, last joint linear and fully as long as the other 4 

 combined. Posterior antennae with the outer ramus scarcely exceeding half the 

 length of the inner, and 4-articulate. First pair of legs with the outer ramus 

 scarcely longer than the basal joint of the inner, and carrying on the tip 4 pulv- 

 inular, recurved spines accompanied by a slender ciliated seta. Last pair of legs 

 with the terminal joint more than twice as long as the basal one, and narrow 

 lozenge-shaped in form, with one short apical seta and 4 more slender lateral 

 ones, edges of the joint densely hairy. 



Colour yellowish, with a more or less distinct rosy tinge, outer part of 

 anterior antennae dark violaceous. 



Length of adult female 0.88 mm. 



Remarks. The above-described form is unquestionably that recorded by 

 Glaus and other authors as Scittellidium ihisboides, the identity of which with 

 Philippi's Psamathe longicauda I cannot doubt. Whether the 2 forms described as 

 Scutellidium Arthuri Poppe and 8. plumosum Brady, are in reality specifically 

 distinct from the type, seems to me somewhat questionable. 



Occurrence. This form seems to be of very rare occurrence off the Nor- 

 wegian coast. I only succeeded last summer in securing a few female specimens 

 at Kopervik and Bukken in the lower part of the Stavanger Fjord. The spe- 

 cimens occurred together with Aspidiscus littoralis close to the shore on the 

 fronds of Laminaria digitata at low-water mark. 



Distribution. British Isles (Brady), coast of France (Canu), Mediterranean 

 (Philippi, Glaus), Black Sea (Karawaiew), ? Franz Josef Land (Scott). 



Gen. 23. MaehairOpUS, Brady, 1883. 



Generic Characters. Anterior division of body much depressed, with the 

 cephalic segment very large, rostral projection obtuse, not defined at the base. 



