310 PROCEEDINGS OF THE ACADEMY OF [1886. 



large, bordered by two or three ? minute, conical papillae, unarmed 

 within ; integument smooth throughout, not annulate. Female : 

 caudal extremity straight, smooth ; tail straight or sliglitly bent 

 back from tlie distinct anal aperture, conical, blunt. Male : 

 caudal extremity spirally enrolled two or three times, furnished 

 with narrow band-like granular alae sustained by twelve pairs of 

 ribs or cylindroid papillae, of which seven pair are preanal ; tail 

 curved conical, subacute ; penal spicules, one four times the 

 length of the other. 



Length of female 40 to 55 mm., breadth 0-5 mm. ; tail 0-3 long. 

 Length of male 24 to 30 mm. ; breadth 0.3Y5 mm. ; tail 0-25 from 

 genital aperture. Long penal spicule 0*88 mm. ; short one 0-2 

 mm. 



Pharynx cylindrical, 0-25 mm. long; oesophagus cylindrical, 

 slightly expanded at lower end, 3 mm. long ; intestine nearly same 

 diameter. Eggs thick shelled, oval, 0*04 long, 0*024 broad. 



A multitude of individuals obtained from the swimming blad- 

 der of the lake trout, Salvelinus namaycuah. Lake Superior. 

 Dr. James H. Bissel. 



The species bears considerable resemblance to Ancyracanthus 

 cystidicola (Rud, Schneider, Mon. d. Nematodon, 105), from a 

 like position of Salmo furio of Europe, but it possesses distinct 

 characters even generic. It also resembles Filaria denticulata 

 (lb. 102), but is devoid of the tegumentary spines and other char- 

 acteristic marks of that species. 



Filaria helecina. Molin, Sitzungsb. Wien. Akad. Wiss., lSo8, xxviii, 391. 

 Filaria aiihiufjir. AVyman, Proc. Boston Soc. Nat. Hist., 1868, 100. 

 Enstroniji/li(s. Packard, Hayden's Rep. U. S. Geol. Surv., 1873, 735. 

 Filaria Wymani. Leidy, Proc. A. N. S., 1882, 109. 



Numerous additional specimens from the brain of a dozen indi- 

 viduals of Plotus anhinga. Florida. Dr. B. H. Warien. 



Trichosomum tenuissimum. Diesing, Syst. Helm., ii, 256. 



Body cylindrical, obtuse at both ends, viviparous. Four females, 

 1 lines long by 0*25 mm. thick. Intestine of the dove, Zenaidura 

 carolinensis. From two birds. Florida. Dr. B. H. Warren. 



? Monopetalonema eremita. 



Body cylindrical, slightly narrowest anteriorly ; head with an 

 annular expansion of the integument, which is more dilated 

 below ; mouth with a pair of half-conical lips, divided into four 

 papillae at the apex ; tail short, straight, conical, obtuse. 



