NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 349 



SPECIFIC DIAGNOSIS OF LEPOCREADIUM BIMARINUM 



Body ovate to elongate according to contraction state, usually widest 

 near posterior end which is broadly rounded ; spined almost to posterior 

 end; without definite eye spots; length 1.200 to 1.900; greatest width 

 0.412 to 0.552; forebody 0.305 to 0.555 or about 1/3 to 1/5 total body 

 length. Oral sucker 0.143 to 0.210; acetabulum 0.195 to 0.266, somewhat 

 larger than oral sucker, sucker ratio about 4 :5 to 3 :4, or in a few cases the 

 acetabulum is only slightly larger than oral sucker. Short, wide prephar- 

 ynx; pharynx usually longer than wide, 0.099 to 0.130 long by 0.061 to 

 0.110 wide; esophagus short and wide; intestinal bifurcation not far an- 

 terior to acetabulum or (if forebody is extended) about midway between 

 suckers; ceca extending to near posterior end. Genital pore slightly to the 

 left a short distance anterior to acetabulum, near intestinal bifurcation. 



Testes smooth, rounded or ovoid, tandem, close together, in posterior 

 half of body. Posttesticular space 0.285 to 0.442, rather variable, may be 

 % body length or only about Yq. Cirrus sac longer than wide, of almost 

 equal width except narrowing near posterior end, not extending posterior 

 to acetabulum, sometimes not reaching middle of acetabulum, sometimes 

 reaching past the middle, containing a short muscular tube near its base, a 

 wider pars prostatica in its middle half and a cirrus (straight or slightly 

 sinuous) ; external vesicle a somewhat coiled tube extending almost to 

 the ovary. Ovary spherical or ovoid, smooth, immediately pretesticular, 

 slightly to the right ; seminal receptacle largely dorsal to posterior half of 

 ovary; vitelline follicles large, sometimes not reaching acetabulum by a 

 short distance, sometimes just reaching the acetabulum, in a few cases 

 reaching almost to mid-acetabular level; dorsal, lateral, and ventral to 

 ceca. Uterus to left and anterior to ovary ; metraterm a little shorter than 

 cirrus sac. Spines in cirrus or metraterm not seen. Eggs usually collapsed, 

 51 to 70 by 25 to 32 [x, usually 53 to 64 by 27 to 32 /x. Excretoiy vesicle 

 not well seen but apparently reaching to the anterior testis. 



The name bimarinum indicates the occurrence of this species in both 

 the Atlantic and Pacific Ocean. 



Comparisons. L. bimarinuin differs distinctly from L. pegorchis 

 (Stoss.), L. ovale Manter, L. trulla (Linton), and L. clavatum (Ozaki) 

 in that the vitellaria do not extend anterior to the acetabulum. It is most 

 similar to L. album (Stoss.) but differs in that the acetabulum is larger 

 than the oral sucker and the cirrus sac does not extend posterior to the 

 acetabulum. The eggs of L. album become larger or at least wider, and 



