256 PROCEEDINGS OF THE ACADEMY OF [April, 



pair of maxillae (II) thick, triangular, curved plates bearing a thin 

 internal accessory plate or wing, and about five marginal teeth on the 

 left' and seven on the right side, the most anterior in each case being 

 strongly hooked and much the largest. The anterior pairs (III and IV) 

 are small plates with one very acute, erect, claw-like tooth, III, having 

 on the left side one and on the right side two additional small internal 

 cusps. On the left side there is also a minute V bearing two small 

 hooked teeth. 



Color brown, each somite sometimes with two dark rings which 

 may be concentrated in deep spots above the parapodia. Cuticle 

 with a brilliant green iridescence. 



The specimens were taken at a big tide pool near Monterey Bay, 

 the type on July 6, 1905, and the cotypes on June 20, 1905. 



STAURONERBIDJE. 

 Stauronereis moniloceras sp. now (Plate VIII, figs. 21-29). 



Form moderately slender, stoutest in pharyngeal region, thence 

 tapering regularly caudad; anterior end broadly rounded, strongly 

 arched above, flat below becoming rather more depressed posteriorly 

 but the dorsum remaining rather strongly arched. Maximum length 

 recorded 69 mm., width in pharyngeal region 3 mm.; number of seg- 

 ments up to 110. 



Prostomium subgloboid, not annulated, broadly shield-shaped in 

 outline, slightly longer than broad, slightly contracted toward the 

 posterior border which bears a small, median, rounded lobe united 

 with the median peristomial lobe. Ventrally a pair of conspicuous 

 palpal ridges separated by a deep cleft pass from the prostomium 

 into the mouth and terminate in pointed processes within the buccal 

 chamber. Dorsal tentacles arise from sides of prostomium just be- 

 hind the middle, are about one and one-half times as long as prosto- 

 mium, slightly curved and divided into about seven (6-8) short joints. 

 Very conspicuous palps arise from beneath the tentacles from enlarged 

 bases continuous with the palpal ridges and curve boldly back round 

 the sides of the mouth ; they are about one and one-half times as long 

 as the tentacles, rather strongly flattened proximally and undivided 

 except for a few transverse furrows along the concave side. Eyes 

 two pairs, black, conspicuous, rounded, the posterior dorsal and close 

 to the posterior border, the anterior dorso-lateral and just anterior to 

 base of tentacles. 



Peristomium enlarged and swollen, three times as wide as prosto- 

 mium, nearly twice as wide as long and about as long as three succeed- 



