1905.] NATURAL SCIENCES OF PHILADELPHIA. 543 



equailing the width of the body without the parapodia; they taper 

 regularly, then suddenly to a terminal filament, and reach far beyond 

 the end of the foot itself to the tips of the elongated setae; no cilia or 

 papillse are borne on the surface. These cirri are confined to the seg- 

 ments lacking elytra at the anterior end and all are of equal length. 

 Ventral cirri occur on all segments. They arise from about the middle 

 of the ventral surface of the neuropodium and reach nearly to the tip 

 of the presetal lobe. In form they are rather stout and conical with a 

 short terminal filament. That borne on II has a large ceratophore and 

 a style resembling the dorsal cirri in form and size. The next one has 

 no ceratophore and the style is abovit half as long, while succeeding ojies 

 regularly dhninish in length until the normal is attained. At the pos- 

 terior end the parapodia diminish in size and the ventral cirri are rela- 

 tively much longer. The caudal cirri are similar to the dorsal cirri and 

 equal the last 9 segments. 



Elytra are probably more numerous than in any other species of the 

 family. They occur on II, IV, V, VII, IX, XI, XIII, XV, XVII, XIX, 

 XXI, XXIII, XXVI, XXIX, XXX, XXXII, XXXIII, XXXV, 

 XXXVI, XXXVIII, and then on every somite for 79, leaving only 3 

 or 4 very small somites at the caudal end doubtful, though these cer- 

 tainly bear no dorsal cirri. It is true that a majority of the elytra are 

 detached and lost, but in several cases they remain on 3 or 4 successive 

 segments. There is, moreover, no mistaking the elytrophores, which 

 are thick, prominent and wrinkled, with swollen margins surrounding 

 the scars. The continuous presence of elytra is further indicated by 

 the total absence of dorsal cirri from this region. Even on the cir- 

 riferous somites there is a broad dorsal tubercle with a slightly free 

 margin. It is barely possible that this specimen may be abnormal, 

 but the constancy and regular, paired arrangement of the elytrophores 

 render this extremely improbable. A very few cases were noted in 

 which the elytrophores and elytra were of smaller size than usual. The 

 elytra are of a very soft gelatinous texture, of large size, with nearly 

 central scar, and the margin is broadly lobed and so folded as to draw 

 the elytron into a funnel form. Both those of the same pairs and on 

 contiguous somites are curiously adherent over the back, forming a sort 

 of irregular roof. The adhesion results from a gritty substance, perhaps 

 an extraneous deposit, perhaps a secretion, but apparently not due 

 solely to the method of preparation, as other species contained in the 

 same bottle are free from it. 



The dorsal surface of the body generally, the head and its appendages 

 and the proboscis are raisin color; the elytra are more or less tinged 



