1909.] NATURAL SCIENCES OF PHILADELPHIA. 253 



Farther back the slender seta? become fewer and the pectinate setae 

 of two forms, the one like those on anterior segments, the other (fig. 

 146) with few coarse teeth. Compound setae have the distal end of 

 the stems somewhat coarsely toothed and the appendages very long, 

 slender and tapered, with scarcely visible marginal denticulation 

 (PI. VII, fig. 15) ; more dorsal appendages are fully twice as long as 

 the most ventral and all appendages become longer caudacl. 



Jaws deep brown, moderately hard but generally less massive than 

 those of M. stylobranchiata. Mandibles (PL VII, figs. 17, 18) of two 

 sides only slightly united, the carriers moderately divergent, long, 

 regularly tapered and rather rough; calcified end-plates small, irregu- 

 larly elliptical and coarsely toothed on the margin. Forceps jaws 

 (PL VIII, figs. 19, 20) with carriers of incompletely united halves, 

 quite as wide as long, broad and truncated at both ends and with a 

 deep lateral notch about the middle of each side. The forceps have 

 broad, strongly ridged hinge bases and edentulous masticatory plates, 

 the distal part being comparatively slender and not strongly hooked. 

 The second pair of maxilla? (II) are large and nearly symmetrical, 

 each bearing four or five large, stout, hooked teeth. The next plate 

 (III) is curved and much larger on the right, on which it bears seven 

 or eight blunt conical teeth, than on the left side which bears six. 

 In addition the right side bears a single small jaw, consisting of two 

 thin plates meeting in a thickened ridge (IV). On the left side is a 

 similar but smaller lateral jaw (V) and an internal curved plate bearing 

 about six marginal teeth (IV). 



Color anteriorly dull reddish purple marked with numerous small 

 white spots, the cuticle with a greenish iridescence. Posteriorly the 

 color is grayish with a pink tinge. 



Type locality San Diego; E. C. Starks, collector. 



ONUPHIDiE. 



Diopatra californica Moore. 



Diopatra californica Moore, Proc. Acad. Nat. Sci. Phila., 1904, pp. 4S4-487; 

 PI. XXXVII, figs. 1-9. 



San Diego, six specimens, including the type and cotype, taken in 

 the tidal zone. Some of the gills are less elongated than in the type, 

 and on one the spiral arrangement continues to about XXXIV. When 

 perfect the tentacles taper to slender tips, the median reaching to XX, 

 the inner pair to XVIII and the outer pair to XII. On one counted 

 the last gill is on LVI. 



