20 G. 0. SARS. [SEC. ARC. EXP. FRAM 
83. Zaus abbreviatus, G. O. Sars. 
This form, as yet only known from the Norwegian coast, was 
found occasionally together with the preceding species. 
84. Zaus Goodsiri, Brapy. 
Two specimens only of this large and distinct species were found. 
Fam. Porcellidiide. 
85. Porcellidium fimbriatum, Cuaus. 
A solitary specimen of this easily recognisable form was found in 
a bottle of specimens taken on July 9, 1901. 
Fam. Idyide. 
86. Psamathe Arthuri (Poppe). 
(Pl. Ul, figs. 7—11). 
Stutellidium Arthuri, Porpz, |. c. p. 291, Pl. XXI, figs. 1-4, Pl. XXU, 
figs. 1-12. 
Specific Characters. — Female. Anterior division of body 
broad and depressed, with the lateral parts of the segments lamellarly 
expanded and angular behind. Cephalic segment about the length of 
the 4 succeeding segments combined, rostral projection broad and 
lamellar, obtusely truncated at the end. Penultimate segment of meta- 
some scarcely narrower than the preceding ones, and having the hind 
edge almost straight. Last pedigerous segment, as in the type species, 
very small and firmly connected with the 1st caudal segment. Uro- 
some comparatively shorter than in the type species, being scarcely 
more than 1/3; as long as the anterior division, genital segment some- 
what dilated and much larger than the others. Caudal sete slender 
and elongated, the innermost but one almost as long as the whole body. 
Anterior antenne resembling in structure those in P. longicauda, the 
terminal part tapering abruptly, with the last 2 joints narrow linear 
in form. Posterior antenne and oral parts exhibiting the structure 
characteristic of the genus. 1st pair of legs almost exactly as in the 
type species. Natatory legs likewise very similar. Last pair of legs, 
however, differing more conspicuously, the distal joint being compara- 
tively shorter and less densely setous on the edge, tip obliquely 
truncated. 
Length of adult female 1.32 mm. 
