462 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



inimicns available to me, but I cannot consider this character of any 

 importance in view of the varying degrees of contraction produced 

 in specimens of Turbellaria on fixation. I found no differences in eye 

 arrangement and copulatory apparatus between the two forms. Ac- 

 cording to Palombi's figures and text, the genital pores are farther 

 apart in inmiicus than in tenax, but many of the whole mounts of 

 inimicus kindly presented to me by Dr. Pearse show them as close 

 together as in tenax. For teriax Palombi figures and describes numer- 

 ous closely packed cement glands entering the middle third of the 

 vagina and neither mentions nor illustrates any cement glands for 

 iniTnums; but my sections of inimicus have cement glands identical in 

 location and arrangement with those of tenaux. In short, I am of the 

 same opinion as Pearse, that inhni-cus and tenax are identical. 



STYLOCHUS ZEBRA (Verrill. 1882) 



Stylochopsis isehra Verrill, 1882, p. 462. 



Stylochus zehra Verrill, 1892, p. 463, pi. 40, fig. 3 ; pi. 42, figs. 2, 2a.— Pearse, 1938, 

 p. 72.— Pearse and Littler, 1938, pi. 20, fig. 3.— Hyman, 1939a, p. 133, fig. 1. 



Material. — Number of whole mounts collected by Pearse. 



Form. — Oblong or oblong-elliptical, thick, firm, rounded at ends, 

 maximum length 30-40 mm., breadth 10-12 mm.; tentacles short, 

 rounded. 



Eyes. — ^Marginal band completely encircles margin, almost as wide 

 posteriorly as anteriorly but with fewer and less crowded eyes. Ten- 

 tacles contain numerous eyes; cerebral eyes in paired elongated 

 clusters which merge into frontal eyes scattered over anterior end 

 and merging into marginal band. 



Color. — Dorsal pattern of alternating flesh and brown cross bars 

 of which the most anterior and posterior ones are V-shaped. 



Digestive tract. — Pharynx large, central, with elongate branching 

 folds; mouth anterior. 



Reproductive system. — Described and figured by Hyman, 1939a, 

 fig. 1, p. 133; prostatic vesicle rounded, erect, penis papilla well 

 developed, conical; seminal vesicle tripartite. 



Distribution. — Massachusetts to North Carolina. 



Habits. — Sluggish, inactive, found on wharves and pilings and 

 oftenest in shells, especially those containing hermit crabs. 



STYLOCHUS PULCHER. new species 

 FiGXJRE 26 



Material. — One living specimen sent by Dr. Pearse. 



Form. — Elongate, oblong, anterior end somewhat truncate, pos- 

 terior end pointed (fig. 26, a), 30 mm. long, 8 mm. wide when 

 extended in motion; tentacles rounded. 



