1911.] NATURAL SCIENCES OF PHILADELPHIA. 291 



lateral wing and four or five stout teeth. The next anterior plate 

 (III) has an oblong, lateral supporting plate and a curved dentigerous 

 margin, bearing three or, in one case, four teeth. Anterior plate (IV) 

 slightly larger than III, with ovate-quadrate supporting plate and a 

 thick medial border bearing two stout triangular teeth. 



All of the specimens are pigmentless with a delicate pale blue 

 cuticular luster. 



Stations 4,454, Monterey Bay, off Point Pinos Lighthouse, 65-71 

 fathoms, green mud. shells and gravel; 4,463, same locality, 36-51 

 fathoms, soft dark gray mud; 4,496 (type), Monterey Bay, off Santa 

 Cruz Lighthouse, 10 fathoms, fine gray sand and rock. 



Lumbrineris tetraura (Schruarda) Ehlers. 



Lurribriconereis tetraura Ehlers, Festschr. K.Gesellsch. Wissensch.Gottingen, 

 1901, pp. 137-139, Taf. XVII, figs. 1-10. 



A fine example of what is undoubtedly this far southern species 

 was found among some Aracoda semimaculata. It is 114 mm. long 

 and 1.6 mm. wide at XII, the spread between the tips of the parapodia 

 at the same place being 3 mm. Segments 121. Compared with Ehler's 

 figures, the prostomium is somewhat shorter and much more broadly 

 rounded and the postsetal lobes somewhat longer and more erect. 



The segments often exhibit a faint biannulation. Posteriorly they 

 are somewhat depressed and the appearance of depression is con- 

 siderably enhanced by the prominent outstanding parapodia which 

 equal the width of the segments. Pygidium a short ring bearing two 

 pairs of cirri, of which the dorsal is somewhat shorter and thicker, the 

 ventral slightly divergent, longer and more slender. Crochets occur 

 on all segments, the anterior being long and limbate with small heads, 

 but they gradually assume the typical form which is attained by about 

 XXXV. A single acute seta continues to at least C. Both setse and 

 jaws agree closely with Ehler's description, the three pairs of maxilla 1 

 having one, two and four teeth, respectively, and the mandible a very 

 characteristic form. It is to be noted, however, that Ehler states that 

 limbate setse extend to about somite XXI only and that articulated 

 crochets occur in the anterior seventeen segments of young worms. 



Station 4,496, off Santa Cruz Lighthouse, Monterey Bay, 9-11 

 fathoms, hard sand. 



Lumbrineris bifilaris Ehlers. PI. XX, figs. 135-142. 



Lumbriconereis bifilaris Ehlers, Festsch. K.Gesellsch. Wissensch.Gottingen, 

 1901, Math.-Phys. Kl., pp. 139-141, Taf. XVIII, figs. 1-10. 



This interesting and abundant species resembles Ehler's south 

 Chilean species very closely in every respect except the structure of 



