1903.] NATURAL SCIENCES OF PHILADELPHIA. 473 



Amphitrite cirrata Miiller. 



North Japan, 3,771, 61 fms., numerous specimens of small size. 



Pista cristata (MuUer) Mgrn. 



Sagami Bay, 3,698, 153 fms.; North Japan, 3,771. 61 fms. 



The branchise exliibit the usual asymmetry. The papillae above 

 the setigerous processes are on the posterior end of VI and VII, not on 

 VII and ^TII, as they are said to be in European specimens. 



Scionella gen. nov. 



Sides of the first 4 somites bearing prominent wings; a single pair 

 of branchiae arising from a transverse dorsal fold ; setae begin on IV. 



Scionella japonica sp. nov. (PI. XXVI, figs. 79, 80.) 



The type, which consists of 49 somites, a few of the posterior ones 

 having been lost, measures 70 mm. long and 5.5 mm. in greatest diam- 

 eter. Rather slender, and only very indistinctly divided into thoracic 

 and abdominal regions. 



Prostomium a rather thick, prominent, trefoil-shaped fold, which 

 projects stiffly out above and at the sides of the mouth, its margin 

 somewhat rolled outward, a dorsal ridge beliind the tentacles. No 

 visible eyes. Tentacles at least 15 on each side, rather large, grooved 

 longitudinally but in these specimens much contracted, broad and flat. 

 Peristomium distinct all around, produced ventraUy into a free margin, 

 within which the rather large quadrate lower lip is \dsible, and wliich 

 ends laterally in a pair of wing-hke lateral lobes ; dorsally very short, 

 appearing as a mere ridge behind the tentacular ridge and bearing a 

 dorsal pre-branchial tubercle on each side. 



The 2d, 3d and 4th somites have no ventral folds but bear still more 

 prominent wing-like lateral lobes, which rise successively to a higher 

 level and overlap from behind. Those of somite IV are united across 

 the dorsum by a high transverse fold wliich slopes upward and forward 

 above III and bears the gills on its free edge. The next 10 somites are 

 well marked, triannulate dorsaUy and with distinct ventral plates which 

 undergo no change in form except that the last has roughly the form of 

 an equilateral triangle. Somewhat large and swollen post branchial 

 tubercles occur above the parapodia on aU somites of this region as 

 far as XIV. The whole region is somewhat depressed, smooth, and 

 convex above, flattened below, with distinct longitudinal grooves 

 above and below the parapodia. The next 10 or 12 somites are large 

 and their boundaries indistinct, while the remaining ones are sharply 

 defined, shorter, and distinctly subdivided into annuli. Throughout 

 the greater part of the abdominal region the dorsum is arched and the 



