1903.] NATURAL SCIENCES OF PHILADELPHIA. 413 



piece, which is continuous with the prostomial lobes, is shghtly shorter, 

 and arises at a shghtly more ventral level. Palpi about 3 times length 

 of prostomium, tliickened basally, tapered to end, which bears a very 

 short terminal filament. 



The peristomium presents no noteworthy features. Tentacular cirri 

 similar to lateral tentacles, the dorsal somewnvhat exceeding median 

 tentacle, the ventral slightly shorter; the slender parapodium, which 

 supports them, reaching beyond the tentacular basal pieces. 



The typical parapodium (X) presents the following features: neuro- 

 podium large, nearly truncate or slightly angulated at the point from 

 which the deep brown aciculum protrudes, ventral margin horizontal, 

 dorsal sloping with a slight curve to the elytrophore ; notopodium amere 

 lobe on antero-dorsal face of neuropodium, supported by a slender 

 aciculum. A'entral cirri with a short filiform appendage, the tip of 

 which falls short of the bases of the neuropodial setce ; dorsal cirri borne 

 on prominent ceratophores which have a dorso-caudad position with 

 relation to the foot, similar in form to the tentacular cirri, about 2^ 

 times as long as the ventral cirri, of which length the ceratophore 

 constitutes -J. 



The ventral cirrus of the 1st foot is, as usual, longer; on the last two 

 the dorsal ceratophores become posterior; the last foot lacks the noto- 

 podium, or at least the notopodial setae. The anal cirri are the longest 

 appendages of the body, fully twice the dorsal cirri, and bear very long 

 filiform tips. 



Twelve pairs of elytra are borne, on somites II, III, IV, VI, VHI, X, 

 XII, XIV, XVI, XMII, XXI and XXI^^ They are strongly imbricated 

 and tough, membranous and firmly attached. With the exception of 

 the first and last they are elongate-pyriform, or more ovate posteriorly, 

 attached posterior to the middle, and with the slender pre-peduncular 

 portion covered by the preceding scale; the first is broadly ellipsoidal, 

 the last roughly triangular with the longest side mediad and the angles 

 rounded. With the exception of a narrow smooth area at the anterior 

 end, the entire dorsal surface of the scale is thickly clothed with papillae 

 of various kinds. Anteriorly are a few small conical spines with apices 

 directed obliquely toward the posterior margin of the scale. Farther 

 back they become larger and more numerous and distinctly differenti- 

 ated into two forms distributed to the internal and external halves of 

 the scale. On the external area they remain smaller and depart less 

 from the simple conical form, but most of them develop a few jagged 

 points at the apex and become more elevated, especially those of a 

 marginal series, which are larger and somewhat clulj-shaped. On 



