Helminth Fauna of the Dry Tortugas. 57 



Dimensions in balsam: Length 1.55; breadth 0.58; neck 0.38; oral 

 sucker 0.08; pharynx 0.05; ventral sucker, length 0.28, breadth 0.31; 

 ova 0.024 by 0.014. 



In the other specimen the ventral sucker measures 0.35 in length 

 and 0.29 in breadth. 



Leurodera decora gen. et sp. nov. (Figs. 128, 129.) 



Etymology: ?.soi>d'^, smooth; ''>ii''f/, neck. 



Body smooth, ccmpressed, long ovate, greatest breadth back of ven- 

 tral sucker; middle of ventral sucker about middle of length of body, or a 

 little nearer posterior than anterior end; diameter of oral sucker about 

 half that of ventral; oral sucker ventral; pharynx a little longer than 

 broad, adjacent to the oral sucker; esophagus short or none; intestinal 

 rami, often inflated, extend to posterior end of body. Genital aperture 

 ventral, on median line just behind pharynx; cirrus short, prostatic cells 

 few, small; cirrus-pouch about dorsal to bifurcation of intestine; seminal 

 vesicle dorsal, median, extending from cirrus-pouch to ventral sucker; 

 metraterm ventral to seminal vesicle. Testes 2, lateral, opposite, be- 

 hind ventral sucker; ovary median, behind testes; seminal receptacle in 

 front of ovary at its anterior border; vitelline glands 2, slightly lobed, 

 situated to right of ovary and behind the right testis. The folds of the 

 uterus occupy a large part of the body in front of the ventral sucker and 

 behind it, between the testes and behind the ovary, in some cases largely 

 obscuring the other organs. The excretory vessel is single, median, and 

 dorsal to ovary, from posterior end to a point a short distance behind the 

 ventral sucker, where it divides into two branches. The two anterior 

 branches meet above the anterior end of the pharynx. The posterior 

 stem was seen in one case to be deflected to the left. Ova small, about 

 twice as long as broad. 



Host, HcBmulon macrosiomum: 



1906, July 10, I fish, 2 distomes; July 13, number not noted, few. 



1907, June 28, 2 fish, 2 distomes; July 13, i fish, 6 distomes. 

 Dimensions, life: Length 2.24; breadth 0.73; oral sucker 0.22 ; phar- 

 ynx 0.08; ventral sucker 0.39; ova 0.04 by 0.02. 



Host, Hcemulon plwnieri: 



1907, July 15,1 fish, distomes few. 



1908, July 6, I fish, I distome. 



Dimensions, balsam: Length 1.96; breadth 0.68; oral sucker 0.22; 

 pharynx o.ii ; ventral sucker 0.40; ova 0.039 by 0.017. 



Host, Hcsmulon sciurus: 



1907, June 28, I fish, few distomes. 



Dimensions in life: Length 1.50; breadth 0.68; oral sucker 0.22; 

 pharynx 0.13; ventral sucker 0.51; ova 0.038 by 0.018. 



Host, Anisotremus virginicus: July 6, 1907, i fish, i distome. 



Dimensions, life: Length 1.89; breadth 0.74; oral sucker 0.22 ; phar- 

 ynx 0.12; ventral sucker 0.45; ova 0.037 ^Y 0-017. 



Host, Neomcenis griseus: 



One specimen found on a shde containing distomes from this host. 

 Length 0.91 ; breadth 0.47. 



