1903.] NATURAL SCIENCES OF PHILADELPHIA. 475 



the uncini have the number of apical spines greater and all face for- 

 ward in a single much-crowded row, which on XXV contains 65, while 

 a thoracic torus (XVIII) contains 160. 



A decided purplish tint remains anteriorly, otherwise the color is all 



gone. 



North Japan, 3,775, 57 fms., type only; Suruga Bay, 3,378, 167 



fms. 



Polymnia nesidensis (DeL Ch.) Marenz. var. japonica nov. 



The Japanese examples differ constantly from the European as de- 

 scribed by V. Marenzeller, Saint Joseph and others in the longer stalks 

 and fewer branches of the gills and in the less elevated heads of the 

 uncini in which the rostrmn and the contiguous margin of the base 

 are parallel. 



Sagami Bay, 3,704, 94 fms.; Suruga Bay, 3,707, 63-75 fms.; Sendai 

 Bay, 3,768, 25 fms., type. 

 Loimia arborea sp. nov. (PL XXVII, tigs. 81, 82.) 



The type of this species is 120 mm. long and nearly 10 mm. in diam- 

 eter in the thoracic region; it consists of 74 somites. Form robust, 

 with the anterior or thoracic region of 19 somites contributing nearly 

 ^ of the entire length. 



Prostomium very broad, prominent, almost surrounding the mouth, 

 except for the space occupied by the small tubercle-hke lower lip, 

 thrown into 3 deep vertical folds, of which the median is much higher 

 than the symmetrical laterals. Tentacles very few in number (many 

 perhaps detached, though the scars are not visible), small, broad and 

 flattened, the larger ones almost foliaceous in the contracted sta4:e, 

 marked at regular intervals by 4 or 5 transverse bands. No eyes visi- 

 ble. Prostomium with a prominent free anterior border ventrally and 

 laterally, ending above in a pair of conspicuous rounded lobes, just 

 internal to which, on the dorsal surface, is a pair of smooth rounded emi- 

 nences similar to those which occur on succeeding somites. 



Somites II and III are only obscurely distinct ventrally, but quite 

 so, though short, dorsally; 11 has a free anterior border, much like 

 the peristomium, and still more prominent dorso-lateral lobes, which 

 are, perhaps, contributed partly by III. Succeeding somites, both of 

 the thoracic and abdominal regions, are well separated, and more or 

 less distinctly annulated. Well defined ventral plates occur on somites 

 V to XI, occupying the entire distance between the uncigerous tori, but 

 becoming rapidly smaller as the tori extend and shift to a more ventral 

 position; the last one is divided by a cross furrow, the others are entire; 



