1890.] NATURAL SCIENCES OF PHILADELPHIA. 413 



as spots and others as interrupted lines. These proved to be exceed- 

 ingly slender thread worms more or less coiled up in the substance 

 of the liver. They were so delicate that I failed to detach one of 

 them entii'e. One specimen teased out but broken into half a doz- 

 en pieces was estimated to be two inches long and was only one-tenth 

 of a niillimeter thick. The anterior extremity is much attenuated, 

 with the head acuminate ; the jDosterior extremity thicker, straight and 

 without papillae. Mouth minutely papillate, unarmed. Tail very 

 short, blunt conical. Generative aperture at the fore part of the 

 body and conspicuously swollen. The specimen, a female, contained 

 numerous immature eggs. In some fragments of another worm, a 

 third of a millimeter thick, the uterus was distended with mature 

 eggs. These are white, oval, 0*04 mm. long and 0'032 mm. broad. 

 They have a thick striated shell with a cylindrical aperture at both 

 poles. 



16. Echinorhynclius pellucidus Leuckart. 



Body cylindrical, slightly wider at the extremities ; anterior 

 extremity barrel-shaped and armed with two zones of short, conical, 

 recurved spines ; posterior extremity obtusely rounded. Proboscis 

 clavaie, with extremity oval and armed with about a dozen rows of 

 strong hooks ; neck conical, smooth. 



A dozen females, attached to the lining membrane of the intestine 

 0? Mesoplodon sowerbiensis, ranging from 10 to 18 mm. long by 0'6 

 to 1" mm. broad. Submitted by Dr. Cooper Curtice, Washington. 



17. Edxinorhynohus paucihamatus n. s. 



Body cylindroid, widest in front and tapering behind, annularly 

 constricted, truncate at the caudal end. Proboscis cylindrical, about 

 three times the length of the thickness, clavate at the extremity and 

 furnished with a single row of six, large, abruptly bent, hooks, 

 succeeded by two rows of small ones about half the length of the 

 former. Length 4 to 12 mm. ; thickness at the fore part 0'5 mm. ; 

 behind 0*25 mm. ; proboscis 0'5 mm. long ; large hooks 0"625 mm. 



Frequent and abundant in the small intestine of the Black Bass, 

 Micropterus nigrieam ; usually found loose and with the proboscis 

 retracted. 



18. Amphistomum fabaceum Diesing. 



Body hemiovoid, convex dorsally, flat ventrally. Numerous spec- 

 imens, from 7 to 9 mm. long by 3*4 to 5 mm. broad, from the large 

 intestine of a Sea-cow, Manatus latirostris, which died in the Zoologi- 



