456 PROCEEDINGS OF THE ACADEMY OP [Juiie, 



Nino'e palmata sp. iiov. (PI. xxvi, fig?. 6S-7i.) 



Represented by 98 anterior somites, having a length of 34 mm. and 

 a width of 2.5 mm. at somite XX. 



Prostomium of the form of a depressed convex cone with a rather 

 acute apex, length 1^ times the base and about thrice length of peristo- 

 mium, dovetailed ^ into peristomium on dorsal side, delicate lateral 

 grooves from palpi to apex. No eyes visible. Palpi large, free lobes 

 at sides of mouth and dorsad of it. Peristomium longest at sides of 

 head, to which and to the succeeding somite it is partly united laterally; 

 ventrally produced into 3 lobes bounding the mouth laterally and pos- 

 teriorly. 



Somite II distinct, except where united with the peristomium ventro- 

 laterally, length about f peristomium; it bears no parapodium. Suc- 

 ceeding somites very distinct, outlines rounded and regular and of 

 nearly equal length throughout. Body exactly circular, although 

 the presence of the branchia? give to it a somewhat depressed aspect. 



Parapodia appear on II, short, about equal to length of somites from 

 which they arise, the branchiate ones somewhat exceeding this, promi- 

 nent, sloping slightly forward, outline nearly straight to the broadly 

 rounded or truncate end, which is divided into presetal and postsetal 

 lobes, the former somewhat the longer, the latter bearing the gills. 



The branchiae are processes of the postsetal lobe, which even as far 

 forward as V has developed a longer cirrus-like dorsal piece and a 

 shorter and thicker ventral piece. (_)n succeeding somites the former 

 diverges more and more dorsad, and from the dorsal side of the ventral 

 division successive short thick filaments arise, there being 2 branches 

 on V, 3 on VII, 4 on IX, which number continues, with occasional 

 variations to 5, to XXVI or XXVII. When best developed the 

 branchial filaments spread ventrad well below the seta^ ; the dorsalmost 

 cirrus-like one is about twice the length of the others and curves over 

 the back; the next one or two are separated but the lowermost 2 or 3 

 remain connected and diverge like fingers in a palmate manner. All 

 are much wrinkled and evidently contractile. The dorsalmost fila- 

 ment disappears suddenly at about XXX, and the others gradually un- 

 dergo reduction until finally only a minute papilla on the postsetal lobe 

 remains. 



Seta) of two types, both simple; bent lance-shaped ones and hooked, 

 guarded ones which exhibit two modifications toward the two ends of 

 the body. The lance-shaped setae are pale yellow, colorless at the tip, 

 and occur in two groups in anterior somites, the number being reduced 

 more posteriorly by the gradual replacement of the middle ones by 



