1905.] NATURAL SCIENCES OP PHILADELPHIA. 529 



a tuft of short fine bristles in place of the ventral tuft of capillary setae, 

 which is not fully established till about somite VI. 



The type of this species is No. 944 in the collection of this Academy, 

 taken by the U. S. F. C. steamer Albatross at station 3,727, off Japan. 

 This specimen measures 42 mm. long, 17 mm, wide exclusive of the 

 setae, and about 9 mm. deep. A larger example, measuring 60 mm. long 

 and 40 mm. wide in a much contracted condition, was taken off Port 

 Townsend at station 4,205. It agrees in all respects with the foregoing 

 description, which is based upon the type, and has the body cavity 

 filled with egg strings. 

 Aphrodita parva sp. nov. PI. XXXIV, figs. 3-7. 



This interesting species is founded upon two specimens of 6 mm. and 

 9 mm. long respectively, the latter having a maximum breadth of 

 6 mm. at XI, which is about the middle of the body. Owing to the 

 deposit which completely covers the body above the general outline 

 is broadly elliptical, but beneath this the form is that typical of the 

 genus though less attenuated posteriorly. Twenty-seven segments bear 

 parapodia 



The prostomium (fig. 3) is broadly elliptical with the long diameter 

 transverse and about 1^ times the length. The posterior margin is 

 slightly concave ; the anterior face bears a slight median elevation for 

 the tentacle, and on each side and slightly above it a somewhat more 

 prominent papilla bearing two minute pigmented eyes. A small com- 

 pressed frontal tubercle having a smooth surface without lobulations 

 lies between the bases of the palpi. The slender tentacle, which is about 

 2-0- times as long as the prostomium, consists of a rather stout vase- 

 shaped ceratophore bearing a slender tapering style with a terminal 

 knob. The palpi arise close together from the ventral surface of the 

 prostomium; they are about twice as long as the tentacle, relatively 

 slender, and taper regularly from the base to a blunt point; their 

 surface is devoid of cilia. Although the large mouth is situated unusu- 

 ally far forward, being bounded posteriorly by a broad, smooth, un- 

 furrowed lip formed by II, the ventral nerve cord may be seen through 

 the skin to bifurcate to form the circumoesophageal connectives at IV, 

 the usual position of the lip. 



Notwithstanding the great breadth when viewed from above, the 

 body when seen from below is really more slender than usual in the 

 genus, the widest part being only about ^ the apparent width and much 

 less than this posteriorly. The cuticle is opalescent and thickly covered 

 ventrally with spherical papillae. Being thickly covered above with a 

 grayish fiocculent deposit the undisturbed animal looks much like a piece 



