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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 8» 



living animal the body was extremely flat; length, 17 mm; width, 

 7 mm. Tentacles : Length, 1 mm ; width, 0.7 mm. Color gray, with a 

 median light dorsal band and a dark border about this, about 135 

 small dark spots scattered irregularly but evenly over the dorsal 

 surface ; ventrum lighter than dorsum but similarly colored, im- 

 maculate. The dorsum was roughened by small, low, conical papillae, 

 which were more numerous toward the median line; still smaller 

 papillae occurred between these. The tentacles were folds in the 

 anterior margin and had rounded distal ends. The enteron was re- 

 ticulate and showed clearly. The animal swam abount by waving 

 its margins but was not so good a swimmer as Thysanozoon. 



mt 



FioDRB .31. — Paeudoceroa maculoaufi, new speclps : A, Ventral view of body; B, terminal' 

 portions of male and female genitalia; C, murjinal tentarles, lateral and dorsal views; 

 D, distribution of tentacular and cereliral eyes, e. Eyes ; en, enteron ; p, jtonads ; m, 

 mouth ; mt, marginal tentacles ; p, pharynx ; pe, penis ; pr, prostate gland ; sy, shell 

 gliinil : vu, si.cker ; *i;, stMjiliijU v^sirle; u. uttrus ; U(j, uteiinc glands; id, vas diferens; 

 (f, male opening; $, female opening. 



Preserved, the body is 13.1 mm long and 8 mm wide. The lobate 

 pharynx is 1.3 mm from the anterior end, 2.7 mm long, and 1.5 mm 

 wide; it has about seven folds on each side. The following figures 

 indicate the distance of various median structures from the anterior 

 end: Mouth, 1.7 mm; male genital opening, 4.2 mm; female genital 

 opening, 4.8 mm; ventral sucker, 7.9 mm; end of median stem of 

 enteron, 9.8 mm. There is a clear margin about 0.4 mm wide in 

 which the reproductive organs are absent, and the branches of the 

 enteron are therefore clearly visible all around the margin of the 

 body. The ventral sucker is O.G mm in diameter; the muscular 



