168 



UNITED STATES NATIONAL MUSEUM BULLETIN 251 



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Figure 67. — Polyandrocarpa (Eusynstyela) sp. aff. monotestis Tokioka: a, right half of 

 mantle body, inner side; b, left half of same; c, dorsal tubercle; d, optical section of gonad 

 attached to body wall; e, attachment surface of a gonad. 



a perfect fold but are represented by gathered vessels. Inner longi- 

 tudinal vessels arranged ( D = dorsal , V = ventral ) : 



Left D (6) 1 (2) 1 (6) 1 (4) V 



Right D (9) (3) 1 (7) (4) V 



Thicker and thinner transverse vessels alternate regularly, also 

 parastigmatic vessels at some parts of branchial sac. Usually 3 or 4 

 elliptical stigmata in each mesh, but may be up to 14 in larger meshes 

 along right side of dorsal lamina edged plainly. Tentacles very slen- 

 der and numerous, up to 75 m examined zooids. Ciliated groove a 

 short longitudinal slit. Second intestinal loop very wide, its axis 

 passes through cardiac end of stomach which is elongated, about half 

 as long as ventral branch of first intestinal loop, a distinct pyloric 

 caecmn and 16-17 longitudinal plications on surface. Esophagus 

 short. Anal margin plain or thickened, forming two lips, or undulat- 

 ing and fonning a number of lobules, up to a dozen in some zooids. 

 From 6 to 8 elliptical gonads on each side. Each gonad attached to 

 body wall by its posterior half, just at surface of testis (fig. 67c?), 

 which is represented by a single oval follicle (fig. 67e) . 



Remarks. — Although there are a few differences between the pres- 

 ent specimen and Polyandrocarpa {Eusynstyela) 7nonotestis Tokioka 



