1904.] NATURAL SCIENCES OF PHILADELPHIA, 165 



what toward the posterior end, where it terminates in a slightly oblique 

 pygidiiim with a somewhat ventral anus. The peristomium and the 

 base of the collar are dusky with numerous minute spots, which con- 

 tinue also on to the sides of several of the succeeding somites. No 

 distinct ventral plates are developed, but the entire body wall appears 

 to be somewhat glandularly thickened. Throughout the abdominal 

 region the fascal groove is very narrow but distinct. Reaching the 

 ventral middle line of IX it bends to the right and passes obliquely 

 across that segment to the level of the setffi, then in the furrow VIII / IX 

 for a short distance, and obliquely across the dorsum of VIII to its 

 anterior border at the dorsal middle line, from which point it continues 

 forward, becoming very deep on II and I, and finally disappears in 

 the dorsal collar cleft. 



The thoracic setigerous tubercles are quite prominent and the unci- 

 nigerous tori very long, the most anterior ones nearly meeting ventrally 

 and the posterior not much shorter. The abdominal tori are about ^ 

 as long as the anterior thoracic. 



The setas occur in strong tufts, but all are broken short off at the 

 body surface. A few fragments of the terminal parts indicate that 

 they are short and stout, with broad blades distinctly denticulated 

 on the margins. Both thoracic and abdominal somites bear rather 

 large uncini, all of one kind and arranged in a single series. A torus 

 on somite V contains 112, all of one size; on the abdominal somites 

 they are about f as large, and 41 were counted on somite XI. 



They have the form (fig. 44) represented by Malmgren for the type 

 of the genus and quite unlike that figured by Marenzeller for his 

 Laonome japonica. The base is abruptly truncated posteriorly, nearly 

 continuing the direction of the posterior line of the neck, but is pro- 

 duced anteriorly into a remarkably prominent breast that reaches 

 beyond the tip of the beak. A short, thick, erect neck is surmoimted 

 by a scarcely enlarged head with a prominent, acute, slightly recurved 

 beak nearly parallel with the opposite border of the breast, from which 

 it is separated by a sinus much narrower than the diameter of the neck; 

 the elevated crest is composed of 3 or rarely of 4 very distinct, acute, 

 solid teeth of diminishing size. 



Suruga Bay, 3,707, type only, without tube. 

 Euchone alicaudata n. sp. (PI. XI, figs. 14-16; PI. XII, fig. 43.) 



The single example was taken from a tube and is regularly rounded 

 and of equal diameter, with the somites very indistinctly indicated, ex- 

 cept at the caudal end, where the body is flattened and tapers abruptly. 

 The total length is 38 mm., the thorax 6.5 mm., and the branchia 13 



