234 RKSEAkCHES IN HELMlNTHOI.OCiV AND PARASITOLOGY. 



14. Physaloptera retiisa, Rudolphi.— Body cylindrical, most taper- 

 ing in advance ; mouth retractile, with six papilla? ; caudal end 

 acute ; in the male bialate, with the alse supported by four ribs. 

 Four males from 10 to 12 mm. long and a female 24 mm. long from 

 the intestine of l^aramis .'' vSubmitted by Dr. H. C. Chapman. 



15. rrichosomiimf teimissinium, n. s. — In a mature male Brown 

 Rat, Mjis dcciimanns, embedded in the liver, w^ere a number of irregu- 

 lar milk-white bodies, some appearing as spots and others as inter- 

 rupted lines. These proved to be exceedingly 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 entire. One specimen 

 teased out, but broken intD half a dozen pieces, was estimated to be 

 two inches long and was only one-tenth of a millimeter thick. The 

 anterior extremity is much attenuated, with the head acuminate ; 

 the posterior extremity thicker, straight, and without papilke. 

 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. Echiiwrhynchus pci/mid/is, Leuckart. — Body cylindrical, 

 slightly wider at the extremities ; anterior extremity barrel-shaped 

 and armed with two zones of short, conical, recurved spines ; pos- 

 terior extremity obtusely rounded . Proboscis clavate, 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 

 of Mesoplodon soiverbiensis, ranging from 10 to 18 mm. long by 0.6 

 to I mm. broad. Submitted by Dr. Cooper Curtice, Washington. 



17. Echinor/ij'iic/ins paucihamatus, n. s. — Bod)' 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 b>" 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, 

 Mic7'opte)iis nigricans ; usually found loose and with the proboscis 

 retracted. 



