174 Prof. M'ln tosh's Notes from the 



anterior pair are usually so situated that thej 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 E. Johnstoni 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 E. 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. is common. We do 

 not yet know the sexual changes in these forms, but, so far 

 as observed in others, e. g. in Evarne 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 E. 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. Slhenelais 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. limicola, but, like it, inhabiting mud or muddy 

 sand. 



The head is rounded, with a slender median tentacle arising 

 anteriorly, shorter than in S. limicola, and with a ctenidium 

 at each side of the basal region (" cerato,jhore," Fruvot and 

 Racovitza) . The eyes are prominent, the larger anterior pair 

 rounded and looking forwai-d, the posterior semicircuhar or 



* Named after the late Prof. i\I, Sars of Christ iauia. 



