490 PROCEEDINGS OF THE ACADEMY OF [May, 



The jaws (PI. XXXVII, fig. 18) are delicate and nearly colorless, 

 except in the thickest parts, which are brow^l. The maxillae are slen- 

 der, acute and at the base extend beyond the small carriers laterally. 

 The basal dorsal plates have five or six teeth, and the much smaller 

 anterior plates six and ten teeth on the left and right side respectively. 

 The extra plate on the left side has six teeth. 



Even in alcohol the colors of this species are well preserved and rich. 

 The cuticle is everywhere smooth, polished and iridescent. For most 

 of its length the body is beautifully annulated with a rich brown on a 

 creamy- white ground. Each somite is marked on the dorsum with 

 two narrow brown half rings separated from each other by an often 

 impure area of the ground color, often divided by a narrow transverse 

 brown line, and from the bands of the neighboring somites by a nar- 

 rower, purer and more sharply defined intersegmental ring, also usually 

 divided in the middle by a narrow transverse line. A dark median 

 dorsal line is also often evident. The ventral colors are more obscure, 

 but each somite in the anterior region has a dull brown cross-stripe. 

 Farther back the stripes break into a paired series of spots replaced 

 posteriorly by a series of narrow median spots, three on each segment, 

 a very small one in the furrow, followed by a considerable interval, 

 then a larger spot, a small interval and then the largest, an oval spot 

 which extends over nearly one-half the length of the somite. The 

 sides of the segments and, except anteriorly, the parapodia are color- 

 less. For about the first ten somites the brown color becomes richer 

 and nearly continuous on the dorsum, except that the somewhat en- 

 larged fifth segment is pure white and conspicuous and the ninth is 

 chiefly white. On the caudal region of the body the color approaches 

 orange and becomes more suffused. Except for a row of minute dots 

 about its dorsal posterior margin and a pair of larger spots at the base 

 of the caudal cirri, the pygidium is white. The head is pale below with 

 a brown spot in the ventral furrow; above its anterior half and a nar- 

 row median triangle extending from the base of the median tentacle to 

 the posterior margin are brown, the rest pale. All of the tentacles, 

 tentacular cirri and the anterior dorsal cirri are similarly colored ; the 

 ceratophore and all of the constrictions are brown, the enlargements 

 white, resulting in a very sharply defined color annulation. The longer 

 anal cirri are chiefly brown with white rings. 

 Lumbriconereis erecta n. s. (PI. XXXVII, figs. 19 to 22; PI. XXXVIII, figs. 23 to 25.) 



The form and general aspect are about as usual in the genus, though 

 the unusual length and prominence of the lobes of the posterior para- 

 podia overcomes the trimness general to these worms. Full-grown 



