no PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



DISTOMUM LEVENSENI, new species. 

 Plate XII, fig8. 80-83. 



Type.— C'Ai. No. 5S03, U.S.N.M. 



Body depressed, linear but with tendencT to l)e inflated in the cer- 

 vical reoion, wholly covej'ed with minute, low, rounded spines, most 

 conspicuous anteriorly, but discernible along- the lateral margins to the 

 posterior end. The oral and ventral suckers are about equal, the lat- 

 ter situated at about the anterior third or fourth of the length; mouth 

 subterminal, circular, sometimes with the opening distorted; very short 

 pre-esophagus; pharynx moderately elongated; esophagus rather longer 

 than pharynx; intestinal crura extending to ])osterior end of the body. 

 The testes are nearly equalj slightly lobed in specimens which have 

 been killed under pressure, unequal, the posterior being usually the 

 more elongated and lai'ger. In all cases the testes were end to end 

 and behind the middle of the body; in compressed specimens they are 

 separated from each other by a short space. The seminal vesicle is 

 behind the ventral sucker and inclosed in the cirrus pouch, which is 

 inconspicuous. The cirrus passes to the left of the median line and 

 opens in front of the ventral sucker a little to the left. The cirrus 

 was not seen distinctly, l)ut the whole pouch is elongated. Ovary 

 smaller than testes, irregular oval, or oblong elliptical, or subglobular, 

 in front of and close to anterior testis, in uncompressed specimens; in 

 specimens killed under pressure it may l)e separated from the anterior 

 testis by a space equal to once or even twice the diameter of the ovary. 

 A seminal receptacle lies close to the ovary and dorsal to it. Vitelline 

 glands diffuse but presenting some striking variations (figs. 81 and 

 82); in most cases they fill the greater part of the body l)ehind the 

 ventral sucker along the marginal region, covering and concealing the 

 intestinal rami. These glands appear to lie behind the ventral sucker 

 for the most part, although a diffuse and deeply staining layer, which 

 may also be a part of this gland, continues anteriorly to the pharynx. 

 The uterus is in front of the ovary, the ova being, for the most part, 

 between the o\ary and the l)ase of the cirrus pouch. The uterus con- 

 tinues anteriorly beside and to the left of the cirrus to open at the 

 genital aperture in front of the ventral sucker and to the left. Ova 

 rather few and large. 



This distome, according to Pratt's Synopsis, belongs to the genus 

 Allocreadlum. It is near the species D. ocuJatuiu Levinsen. 



The species was found in two of the Bermuda fishes. 

 Ejpinephelus onaculosus. 



July 8, two; July 29, four. The living worms of the first lot Avere 

 yellow^ish w^hite with an amber-colored spot between the ventral sucker 

 and the ovary where the ova la}^; length 2.5 mm., breadth 0.5 mm. 

 One of these, which had been fixed over the flame and afterwards 



