1911.] NATURAL SCIENCES OF PHILADELPHIA. 273 



ten (or the outer left, nine) small, regular close teeth. Maxillae III 

 curved, ridge-like pieces, the left with six, the right with eight small 

 teeth. Maxillae IV very small, edentulous. 



Color generally dull olive-gray, becoming purplish and more iri- 

 descent anteriorly, except on the parapodia and cephalic appendages. 

 Dorsum and to a less extent the sides obscurely clouded, or on one 

 specimen distinctly mottled with dusky. Except on the first ten or 

 twelve segments, there is a more or less distinct double dorsal median 

 dark brown line showing a tendency to break into metameric spots. 

 A series of dorso-lateral spots above the parapodia. Like so many 

 of the species taken at the same station, the surface is marked with 

 strictly quadrate spots scattered over the head and its appendages, 

 parapodia and body segments. 



A complete tube is 152 mm. long and has an external diameter of 2.5 

 to 3 mm. Its foundation is a rather tough membraneous lining inter- 

 mediate in character to that of ordinary Nothria and Hyalinoecia tubes 

 and having a diameter of 1.4 mm. The tubes are very fragile and 

 covered externally with a thick but irregular layer of sand grains and 

 small pebbles. Many of them bear a few rather large pebbles, especially 

 near the lower end, where they probably serve as anchors. One js 

 peculiar in the development at one end of an expanded disk, from the 

 margins of which radiate irregularly a number of hollow fibers or 

 minute tubes probably the work of another than the rightful occupant. 



Thirty tubes and three worms were taken at the only station, 4,454, 

 off Point Pinos Lighthouse, Monterey Bay, 65-71 fathoms, green mud, 

 sand and gravel. 



Diopatra ornata sp- nov. PI. XVIII, figs. 77-85. 



So far as known, this species is below the size usual in the genus, but 

 all of the four specimens are incomplete. The type and most complete 

 one is in three pieces, having an aggregate length of 84 mm. and 121 

 segments. Maximum width (at XX) of body only 3 mm., between 

 tips of parapodia 4 mm.; depth 1.8 mm. 



As viewed antero-dorsally, the prostomium is nearly circular, being 

 bent downward with a nearly vertical flattened frontal face, the seven 

 tentacles almost in contact at their bases, radiating regularly from 

 a point anterior to the center of the prostomium, the flattened circle 

 enclosed by their bases scarcely exceeding the sectional area of any one 

 of the tentacles, while the region posterior to the tentacles is strongly 

 convex. Frontal tentacles almost in contact on anterior margin, about 

 as long as prostomium, conical, obscurely annulated. Anterior paired 



