40 Papers from the Marine Biological Laboratory at Tortugas. 



Enenterum aureum gen. et sp. nov. (Figs. 66-70.) 



Etymology: I'-', preposition in; lyrz/xry^ intestine. 



Body smooth, nearly linear, tapering near the posterior end and 

 narrowing slightly at the anterior end, dorso-ventrally compressed. 

 Color in life yellow to orange, with transparent or colorless borders at the 

 extremities, particularly the anterior. Mouth surrounded by 10 short 

 rounded lobes arranged in pairs, 2 dorsal, 2 lateral, and i ventral, the 

 ventral pair being larger than the others. Oral sucker with its axial 

 diameter greater than the transverse; ventral sucker nearly circular, 

 slightly exceeding the oral sucker, situated at about the anterior fourth. 

 Prepharynx very short, pharynx globular, no esophagus; intestinal 

 rami uniting behind posterior testis near posterior end, the common 

 intestine extending nearly to the posterior end. Genital aperture in 

 front of ventral sucker, a little to left of median line; seminal vesicle, 

 prostate gland, and the short cirrus are included in the space bounded 

 by the anterior edge of the ventral sucker and the rami of the intestines. 

 The vas deferens passes back from the seminal vesicle dorsal to the 

 ventral sucker and a little to the right of the median line. Testes 2, 

 lobed, conspicuous, on middle line one behind the other and near to- 

 gether, the anterior one being about half-way between the ventral sucker 

 and the posterior end. Ovary subglobular, a short distance in front of 

 the anterior testis and a little to the right of the middle line. There is a 

 seminal receptacle which lies dorsal to and extends beyond the caudal 

 border of the ovary. In sections the antero-dorsal part of the ovary was 

 seen to contain large, loosely arranged germ-cells. The shell-gland was 

 dorsal and anterior to this part of the ovary. The vitelline glands are 

 diffuse and extend from a little behind the caudal edge of the ventral 

 sucker to the posterior end, densest along the margins, and scattering 

 over the median region. The folds of the uterus lie between the ovary 

 and the ventral sucker. Metraterm on left of middle line. The excretory 

 vessels are not distinctly shown in the mounted specimens. In the living 

 worms they were seen as lateral vessels behind the ventral sucker, as a 

 median vessel in the posterior third in dorsal view, and again at the 

 posterior end in ventral view. 



Host, Kyphosus sectatrix: 



1906, July 16, 5 fish, 16 distomes. 



1908, July 5, I fish, I distome; July 8, i fish, 8 distomes. 



Dimensions of living specimen: Length 5; breadth, anterior 0.50, 

 middle 1.12, posterior i.oo; oral sucker 0.42; pharynx 0.28; ventral 

 sucker 0.53; ova 0.058 by 0.032. Length of alcoholic specimens from 3 

 to 8 mm. The larger specimens, that is those containing ova, are rather 

 thick or cylindrical-compressed, younger specimens are flat. 



Theledera (g. n.) pectinata (Linton). 



Distommn peclinatum, Linton, Bull. U.S. Fish Commission, vol. xxiv, p. 389, 

 figs. 200-203. 



Etymology: drjX-j, nipple; 8ipr,, neck. 

 Host, Auxis thazard: July 10, 1906, i fish, i distome. 

 The only note made at time of collecting was a brief remark referring 

 the single specimen to this species. 



