TANAIDACEA AND MARINE ISOPODA FROM JUAN FERNANDEZ 533 
Remarks. 
Tanats lineatus is characterized by its chelipeds, which have the free 
distal margin of the propodus very slightly curved, almost straight. This is 
also the case in 7. xovae-zealandiae Thomson and 7. ¢enuicornés Haswell, but 
the first species is distinguished by its well-marked ciliated bands on the first 3 
abdominal segments, and the second species has its carapax very much longer, 
almost as long as the first 4 free thoracic segments. 
A nearly straight propodal edge on the chelipeds is shown also by 7, 
Nierstraszt Stebbing, which differs especially in having the first 3 thoracic 
segments very short. 
The species nearest to 7. /ueatus seems to be the 7. Normanz Richard- 
son from California. From that species 7. /zneatus differs chiefly in its somewhat 
more slender chelipeds, with longer carpus and a nearly straight propodal edge. 
The resemblance between these 2 species is, however, so great that it is pos- 
sible that they may be shown to be identical. 7. Normani Rich. is not known 
in detail and only from 3 apparentiy immature specimens. The conclusion 
that 7. /zzeatus is identical with 7. Normanz is therefore too hasty; the adult 
males and females may very possibly turn out to be much less similar. 
Order ISOPODA. 
Suborder Flabellifera. 
Fam. Anthuridae. 
Genus Paranthura Bate and Westwood 1868, Barnard 1925. 
Pairs Skottsbergi n. sp. — Pl. 20, fig. 4; text fig. 5. 
One specimen, immature female, length 11 mm. 
Loc. Juan Fernandez, Masatierra, calcareous algae, 30—46 m. 
Description. 
Head subrectangular, about twice as long as it is broad. The rounded ante- 
rio-lateral corners anteriorly more produced than the minute rostrum. Anterior 
margin bisinuated with a small triangulate apex (rostrum) between the anten- 
nae. The eyes are large, dark brown, rounded, and composed of about 24 ocelli. 
Thorax. Increases in breadth to the 6th segment. The 4th segment is 
the longest, the 6th is about as long as the Ist. The 7th segment is a little 
more than half of the length of the 6th and about as long as the abdomen 
without telson. The last 3 thoracic segments dorsally with an impressed © 
line a short distance from the anterior margin. 
The ventral side of thorax is strongly elevated and keeled. On the first 
2 segments the keel has a narrow edge, but on the following segments up to 
the 5th the edge widens to a flattened surface, which in the 6th and 7th seg- 
ments diminishes in width. 
