72 PROCEEDINGS OF THE NATIONAL MUSEUM voc. 86 



and show a tendency to be more elongated toward the margins. 

 These are surrounded by a cream-colored background. The body 

 appears slightly darker over the pharjmx and median portion of the 

 gut. There are no spots over the brain. The ventrum is creamy, 

 with a slightly reddish tint. The pharynx and vasa deferentia show 

 as whitish areas. 



Type.—V.S.^M. no. 20187, from St. Vincent Bar, Apalachicola 

 Bay, Fla. ; collected June 12, 1935, by A. S. Pearse. 



Remarks. — Seven specimens were collected on the oyster beds in 

 Apalachicola Bay, June 7 to July 25, 1935. Five of these are de- 

 posited in the United States National Museum. This species was 

 rather rare, for during the same period hundreds of specimens of 

 Stylochus inimicus Palombi were found. In color it is somewhat 

 like the species that Verrill (1873) described as ^''Stylochus^'' lltt oralis, 

 but its tentacles are farther anterior, the size is larger, and the distri- 

 bution of the eyes is different. 



STYLOCHUS ZEBRA (Verrill) 



Stylochopsis zebra Vekbill, 1882, p. 371. 



Several specimens of this species were obtained from Woods Hole, 

 Mass., and are now deposited in the United States National Museum. 



Genus EUSTYLOCHUS Verrill 



As Bock (1925), Bresslau (1933), and Meixner (1907) have 

 pointed out, the Stylochidae consist of a heterogeneous collection of 

 Craspedommata, a fact that makes the separation of various species 

 into genera rather difficult. Notwithstanding the fact that these 

 writers do not recognize Verrill's (1893) genus Eustylochiis, it seems 

 to me proper to do so. The Stylochidae on the east coast of North 

 America appear to fall into two groups: (1) Those in the genus 

 Stylochus have two genital pores, which are clearly separate and lie 

 more than a seventh of the length of the body from the posterior end, 

 and have marginal eyes around the whole body, weak dermal mus- 

 culature, and ovaries ventral: (2) those in the genus Enstylochus 

 have genital pores very close together and less than a twentieth of 

 the length of the body from the posterior end, usually have marginal 

 eyes only around the anterior half, heavy dermal musculature, and 

 ovnries dorsal. Georfje W. Wliarton has bred out larvae from the 

 eggs of Sfylorhtifi immievs Palombi and Eimfylochun m£ndiandlis, 

 new species. He finds that at the time of hatching the former bears 

 no lobes and that the latter has lobes. 



