64 NATURAL HISTOEY OF KERGUELEN ISLAND. 



of the first thoracic segment; the first three segments are scarcely longer 

 than broad, the fourth about as long as the second segment of the an- 

 tenna, and the fifth about twice as long as the fourth ; the third, fourth, 

 and fifth segments are flattened above, with the margins slightly raised, 

 and with a strong median carina. 



Length from front of head to tip of pleon, 37™™; length of pleon, 

 13™™; breadth of first thoracic segment, 24.5™™; greatest breadth at 

 third thoracic segment, 26.5™™; breadth at last thoracic segment, 

 21.5™™. 



ANNELIDS AND ECHINODERMS. 



By a. E. Verrill. 



Yery few species of annelids were collected, and only two species are 

 represented by sufficiently well preserved specimens to warrant full 

 descriptions. One of these is a large terebelloid worm belonging to 

 a genus hitherto seldom met with and but imperfectly known. 



Nereis Antarctica, Verrill, s. n. 



One specimen of a Nereis, about two inches long, lacks some of the 

 caudal segments and part of.the tentacular cirri, but is otherwise pretty 

 well preserved in glycerine. 



The body is moderately stout and tapers from near the head back- 

 ward. The cephalic lobe is rather narrow, and suddenly more narrowed 

 in front of the eyes, which are large and prominent, those on the same 

 side almost in contact and nearly in the same line ; the frontal antennae 

 are rather long and slender; the upper tentacular cirri are wanting, but 

 the lower ones are rather long and slender, those of the posterior pair 

 reaching back to the sixth body-segment. The buccal segment is nar- 

 rower but considerably longer than the following ones, and has a me- 

 dian obtuse angle projecting forward over the posterior border of the 

 cephalic lobe. The lateral appendages of the anterior segments are 

 rather stout, with a longer, slender dorsal cirrus. The upper ramus 

 consists of two short, stout, obtusely rounded lobes, which are nearly 

 equal in length and form, the upper one bearing the dorsal cirrus at about 

 the middle of its upper side, on a slight swelling, while a fascicle of slen- 

 der compound setae comes out from between them ; these setae project 

 about twice the length of the setigerous lobes, and all have a moderately 



