174 Prof. M‘Intosh’s Notes from the 
anterior pair are usually so situated that they are invisible 
from the dorsum until the head is placed obliquely, whereas 
in E.impar both are visible from the dorsum. The deep 
brownish purple of the dorsum and the longer dorsal bristles 
are also diagnostic. 
The form above mentioned, a fragment of which occurred 
with H. Johnston? at 690 fathoms in the ‘ Porcupine’ Expe- 
dition of 1870, is considerably larger and is distinguished by 
the very large eyes, both of which are conspicuous from the 
dorsum, and by the firm outwardly directed peaks in front. 
The dorsal bristles are longer and stronger, are less 
curved, more acutely pointed at the tip, and with a distinct 
bare portion, while the rows of spikes are narrow, all these 
characters differing from those of £. Johnstoni. The ventral 
bristles, again, have more robust shafts and longer spikes 
in the rows on the tips. That these characters are not due 
to age is clear by comparing specimens of the same size, 
the stronger dorsal bristles with their pointed tips being 
marked in the smallest example of the new form, on the 
bristles of which an elongated Loxosoma iscommon. We do 
not yet know the sexual changes in these forms, but, so tar 
as observed in others, e. g. in Hvarne impar, no such modifi- 
cations of the eyes and bristles occur, 
Only one of the specimens had scales, and unfortunately 
they had been dried. The surface is striolated with minute 
conical spines, which are best developed externally and poste- 
riorly, and, moreover, there are moderately long cilia along 
the external and posterior border. The inner anterior edge 
is free from the spines or cilia. The scales thus closely 
resemble those of . Johnstoni. 
A comparatively frequent species in the collection is Sthene- 
lais limicola, Ehlers, but this is a very widely distributed 
form. The size agrees with that of the British examples. 
Two additional species of Sthenelais appear to be fairly abun- 
dant, viz. Sthenelais Sarsi*, from the Hardanger Fjord at 
depths varying from 40 to 190 fathoms. It is a compara- 
tively small species, probably between 2 and 3 inches, rather 
less than S. lemicola, but, like it, inhabiting mud or muddy 
sand. 
The head is rounded, with a slender median tentacle arising 
anteriorly, shorter than in S. /émicola, and with a ctenidium 
at each side of the basal region (‘ ceratophore,” Pruvot and 
Racovitza). The eyes are prominent, the larger anterior pair 
rounded and looking forward, the posterior semicircular or 
* Named after the late Prof. M. Sars of Christiania. 
