372 PROCEEDINGS OF THE ACADEMY OF [April, 



posterior margin subtruncate and united to the peristomium by a 

 median nuchal fold, which is about one-foiu'th as wide as the prosto- 

 mium and slightly arched. Ocular peduncles small, hemispherical, 

 close together on anterior margin, the right bearing two small black 

 eye-specks, the left lacking them. Tentacle arising from frontal face 

 immediately below ocular prominences, bent downward, very short, 

 not more than one-fourth length of prostomium, consisting of a very 

 short ceratophore and a scarcely longer obpyriform style. Palpi 

 moderately long and slender, about six times length of prostomium 

 with a scarcely distinguishable basal segment, the cuticle smooth and 

 polished to the naked eye but bearing numerous very fine sensory 

 cilia just visible under a magnification of fifty diameters. Facial 

 caruncle a thin compressed plate with somewhat serrated free border, 

 covered with small round papillae, the ventral process very short. 



Peristomium represented dorsally by a short transverse fold, ven- 

 trally by small anterior lips; its parapodia (fig. 67) reaching about 

 half their length in front of the prostomium. Tentacular cirri with 

 well-separated stout cirrophores, the styles long and slender, with 

 distinctly bulbous tips preceded by a constriction and slight subter- 

 minal enlargement; the dorsal about one-half length of palps and 

 directed upw^ard, the ventral slightly shorter than dorsal and directed 

 downward. Mouth bounded by the peristomium, somite II and 

 posteriorly by a broad, nearly smooth lip which divides III into a 

 pair of lateral swellings and reaches to IV. 



Metastomial segments indicated on the venter by transverse integu- 

 mental ridges on a nearly fiat surface bounded laterally by a shallow 

 trench along the bases of the parapodia and divided into a median 

 translucent neural third and lateral muscular thirds; cuticle thickly 

 studded with small globular papillae. Dorsally the segments are 

 ill-defined, without distinct bounding furrows and with thin integu- 

 ments and powerful lateral muscle ridges; cuticle thin and thickly 

 studded] with minute papillae (Pi. XXXI, fig. 66). Pygidium slightly 

 cleft for the terminal anus which does not cut through several segments. 



Elytra fifteen pairs on II, IV, V and every alternate segment to 

 XXIII, then apparently on XXV, XXVIII and XXXI though the 

 last three are somewhat doubtful. They are of large size and are 

 broadly lubricated, completely covering the dorsum beneath the felt, 

 colorless, translucent without markings or incrustations of any kind, 

 soft and thin but tough and leathery. First three pairs elliptical 

 with major axis transverse; several following nearly circular with 

 attachment anterior to center; proceeding caudally they become 



