1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 439 



Length, 24'"'^^ to 3G""" ; diameter about ]■"■". 



This species coustrnots long, slender, straight, round tubes of fine 

 sand and mud, 48 to 70'"'" long ; 1'""' in diameter, found on a bottom of 

 sandy mud, in from 1 to 5 fathoms. Wood's Holi, Mass., September 6, 

 1884. 



This species is easily distinguished from all others known on our 

 shores by having the four eyes nearly in a transverse row. The larvae 

 in various stages of growth were taken at the surface, in the evening, 

 in the harbor of Wood's Holl, during August and September. 



Ammochares artifex Verrill, sp. nov. 



Head appendages partly forked and jjartly bifurcate, white, the two 

 dorsal longest, bifurcate, with about six divisions, which are blunt, the 

 length about one-half the diameter of the body ; the upper-lateral pair 

 are shorter, but also bifurcate, with four small, short, blunt branches; 

 below these are two shorter, smaller, lateral pairs, only once forked. 

 Head obliquely truncate in front, with the mouth terminal. Two first 

 setigerous segments are coalescent with the head, short, with an upper 

 fascicle of slender acute setae, but no lower ones ; on the third setigerous 

 segment there is a long and broad band of uncini, and a group of slen- 

 der setse above. Several segments are long and round, not distinctly 

 separated by a sulcus : several anteanal segments are short and indis- 

 tinct, three, four, or more bearing setse; anal segment simple, with 

 minute papillae. 



Color anteriorly whitish, the head and buccal segment reddish, with 

 a pale ring behind the tentacles ; toward the posterior end the segments 

 are pale flesh-color, translucent, showing the red vessels, and an orange, 

 internal, convoluted organ. 



This species constructs a long, slender, flexible tube, covered with 

 small imbricated grains of sand, which are attached only by their inner 

 €nds, so as to be freely movable, one upon another, when the worm is 

 in motion. 



Off Cape Cod, at station 322, in 67 fathoms, 1879. 



Lepraea abyssicola Verrill, sp. nov. 



Verrill, Trans. Conu. Acad., vol. iv, pi. 20, figs. 3, 3a; pi. 27, fig. 2. 

 Verrill, Eeport U. S. Fish Com. for 1883, pi. 43, figs. 187, 187a, 1>, 1885. 



Body large, elongated, composed of numerous segments, tapering 

 gradually to the posterior end. Many of the segments of the posterior 

 region are destitute of capillary setfe. Cephalic cirri numerous, long 

 and slender. Cephalic collar rather broad, with a row of numerous 

 small black ocelli arranged in many rows just behind the anterior mar- 

 gin. Branchi[B in three pairs, the anterior ones much the largest, the 

 posterior ones the smallest. The anterior pair have a rather long stem 

 giving off five or six branches from the posterior side, the first origi- 

 nating at a little distance from the base, leaving a naked stem. The 

 branches again divide and subdivide in a somewhat arborescent man- 



