1904.] NATURAL SCIENCES OF PHILADELPHIA. 167 



wide on the most dorsal and ventral member of each group, along each 

 radiole and expands at their ends into a leaf-like appendage, through 

 which the naked end of the radiole passes like a mid-rib, and l^eyond 

 which it forms a short mucronatc tip. The filaments present the usual 

 paired arrangement and are numerous and exceedingly long, the length 

 of the basal ones being at least 1^ times the diameter of the thoracic 

 segments. Besides the ordinary filaments a number of very mucli 

 larger ones occur within the radioles, one apparently being attached 

 to the base of each of several of the latter. Though none is perfect, 

 they often equal ^ of the length of the radioles. As they bear slight 

 wings and have distinct cartilaginous axes, they probably represent 

 a second set of naked radioles. The region is so brittle that a thorough 

 study of the specimen is impossible. The tentacles are apparent!}' 

 short ovate-lanceolate in shape. Very small eggs completely fill the 

 body cavity. 



The setse of the first thoracic fascicle and the abdominal somites are 

 apparently all slender, winged capillary, those on the latter with 

 extremely narrow wings. On the other thoracic somites there are 

 two forms; distinguished by the breadth of the wings and not always 

 to be sharply separated. Those in a dorsal group (fig. 14) have slender, 

 longitudinally striated shafts, more or less bent and drawn out to a very 

 fine tip, the winged margin fringed, confined to one side, of varying 

 width and reaching far out toward the end of the shaft. Those of a 

 ventral group (fig. 15) are shorter, stouter, with short, broad, usually 

 asymmetrical, obliquely striated double wings and an acuminate tip. 

 The internal structure is similar to the more slender setee. 



The thoracic uncini (fig. 16), which are arranged in single rows, have 

 long, slender, curved stems with a slight shoulder at the surface of the 

 body and beyond it a neck; the head has a long, rather slender, slightly 

 recurved beak and a crest from which three larger spines are separated 

 on each side below, the rest being finely divided. The abdominal 

 uncini (fig. 43) are truncate behind, somewhat as in Laonome, but 

 with a slightly produced process ; the breast is both high and prominent 

 with a nearlj^ square anterior margin ; the sinus is very small ; and the 

 beak acute, surmounted by a crest exhibiting 6 or 7 teeth of diminishing 

 size along the profile. 



The somewhat horny, stiff tube is covered with coarse sand grains 

 and minute bits of shell. 



Sagami Bay, 3,698, 153 fms., type only. 



