18 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



(Washington, District of Columbia; Lincoln, Nebraska; San Fran- 

 cisco, California). 



The Trlchosoma muris decumani Bayer re- 

 ferred to by Stossich (1890) is probably a 

 reference to this worm in a paper by Rayer 

 (1843). 



Von Linstow (1874) has made a study of 

 this worm, and made it the type of his new 

 genus Trichodes. Unfortunately this generic 

 name was already preoccupied by Trichodes 

 Herbst, 1792, coleopteron, hence the change 

 by Eailliet, 1895, to Trichosomoides. Von 

 Linstow has noted in the esophageal cell 

 chain that in many places there were alter- 

 nately darker cells with large nuclei and 

 lighter cells filled with quite small puncti- 

 form nuclei which showed a lively molecular 

 movement. The cell content of the latter 

 must therefore have been fluid. I find the 

 esophageal cell body actively contractile and 

 the cells full of large, clear granules. 



Eberth (1863) and von Linstow (1874) 

 have both described dorsal, ventral, and 

 lateral bacillary bands. They also agree in 

 a general way that the prevulvar portion of 

 the body is covered with small hyaline hemi- 

 spherical elevations at regular intervals. My 

 observation is to the effect that there is a 

 dorsal and ventral band of cuticular ele- 

 vations, of which the one regarded here as ventral is the more 

 conspicuous, but these bands are ax)j)arently rather different in 



Fig. 16.— Trichosomoides ckas 

 sicAUDA. Posterior EXTREM- 

 ITY OF FEMALE. 



Fig. 17.— Trichosomoides crassicauda. Eggs containing embryos, showing variations in shape. 

 Enlarged. After von Linstow, 1S74. 



structure from the usual bacillary band, although their presence in 

 this family would indicate that they were to be homologized with 



