40 
plate small, pentagonal; the following considerably wider than long, 
broadly in contact; from about the 12th joint they are separated. 
The distal ventral plates are more elongate, but otherwise mainly 
of the same shape as the proximal ones. Side armplates somewhat 
swollen, carrying 2, more rarely 3, slender armspines of the length 
of the arm joints. One large oval tentacle scale at the outer side 
of the pore and sometimes a small one at the inner side. 
Colour (in alcohol) white. 
Though found in the Greenland waters this species is n0 
arctic form; it will doubtless prove to be widely distributed over 
the warm area of the North Atlantic. It has some resemblance to 
Ophiozona sincera Koehler, from which it is, however, easily di- 
stinguished, especially by the shape of the oral shields. 
3. Ophiotjalfa vivipara n.g. n. sp. 
Two specimens were taken by the "Tjalfe" Expedition in 1909. 
Unfortunately there is no exact information of the locality; it is 
very probable that they were taken at the same locality as the 
Ophiozona, but with certainty it can only be said that they were 
taken at the Greenland side of the southern part of the Davis 
Strait. 
Diameter of disk of the larger specimen 5 mm, length of arms 
ca. 15 mm. (none of the arms complete). Disk nearly flat, covered 
with comparatively small scales of rather uniform, size, distinetly 
thickened in their outer part, and accordingly rather prominent. 
The radial shields are not larger than the other disk scales, very 
inconspicuous, resembling the other disk scales in shape; they over- 
lap one another in about their outer half length. No arm combs. 
The dorsal armplates are triangular, only the two proximal ones in 
contact. They are thick and prominent, so that the arm seen in 
side view is conspicuously serrated, each serration being rounded, 
with no peak distally. The interbrachial spaces of the oral side 
are covered with few, irregular plates, one or two in the middle line 
being sometimes slightly larger than the others. The oral shields 
are Conspicuously broader than long, nearly oval, only slightly 
