1912.] NATURAL SCIENCES OF PHILADELPHIA. 461 



have been seen to connect with what appears to be an anastomosing 

 series of canals. The uteri are very distinct in the cotype, and are 

 united anteriorly immediately in front of the pharynx. Relatively 

 small ova occur throughout their entire length, save in the immediate 

 neighborhood of the median egg canal. This last-named tube 

 (PI. XV, fig. 24) is continued posteriorly, and opens into the central 

 region of the accessory sac, which in this species consists of three 

 large pouches of equal size, the usual median one and an anterior 

 pair bordering the egg canal. Anteriorly, the egg canal expands into 

 the ample bursa, abundantly supplied with glands, that opens to 

 the exterior not far behind the male aperture. 



Planocera burchami sp. nov. 



This species is represented by five individuals collected in Monterey 

 Bay at a depth of ten fathoms. The color in alcohol was at first a 

 brownish-pink over the pharyngeal area, with a dark brown line 

 along the middle of the dorsal surface marking the position of the 

 main gut. From the pharyngeal area outward, the color gradually 

 changes to a creamy-pink in the neighborhood of the body margin. 

 The entire, dorsal surface is blotched with white pigment in varying 

 quantity, though the' spots are generally of small size. A small 

 non-pigmented area between the tentacles marks the position of 

 the brain. The ventral surface of the animal is unpigmented, and 

 through the somatic musculature the brain, pharynx, uteri and vasa 

 deferentia are clearly visible. 



All of the specimens are broadly oval in outline, and the largest 

 measured 14 by 11 mm. The mouth (PI. XV, fig. 27) is placed very 

 nearly in the centre of the ventral surface. The tentacles and brain 

 are situated one-fourth of the body length from the anterior margin, 

 the former appearing in preserved material as small, blunt, and 

 hemispherical projections. Circular groups of eyes (PI. XIII, fig. 9) 

 are ranged about their bases, and numerous ocelli are also scattered 

 irregularly between the tentacles. No eyes occur on the body 

 margin. 



The external mouth leads into the pharyngeal pocket that with 

 broad, ample lateral divisions extends at least two-fifths of the body 

 length. The main intestine, closely coinciding with the pharynx 

 in outline, gives rise to six or seven pairs of stout lateral branches 

 and an anterior offshoot, which immediately forms three sub- 

 divisions posterior to the brain. The ultimate divisions of the 

 intestine have never been seen to anastomose. 



