62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL.89 



Pl. 6, Fig. 52. Theristus setosus (Biitschli). One can see the large vestibu- 

 lum, the chitinous ring supporting the esophagus, and the 

 spiral amphids. Note the supporting rods of the vestibu- 

 lum. After Filipjev, 1929. 



Fig. 53. Sphaerolaimiis hirsntiis Bastian. The chitinous ring of the 

 mouth capsule becomes very large, giving place to a spa- 

 cious mouth capsule inside; the rods in the v^ralls of the 

 vestibulum are better developed. Afer de Man, 1907. 



Fig. 54. Comesoma stenocephalum Filipjev. Note the huge spiral am- 

 phid, the six labial and six cephalic papillae, and the four 

 cephalic setae, followed by subcephalic ones. After Filip- 

 jev, 1918. 



Fig. 55. Linhonioeiis lepturus de Man. Note the thin cuticle, the 

 feebly developed chitinous ring of the mouth capsule, and 

 the round, thick-walled amphid, or what might be called a 

 spiral one in one turn. After de Man, 1907. 



Fig. 56. Linhomoeus lepturus de Man, showing the spicules strongly 

 curved and with a double backward-pointing gubernaculum ; 

 this is characteristic of all the members of the family Lin- 

 homoeidae. After de Man, 1907. 



Fig. 57. Dorylaimopsis perfectus (Cobb), showing the double spicules; 

 the gubernaculum is typical. After Cobb, 1920. 



Fig. 58. Dorylaimopsis perfectus (Cobb), showing a side view. After 

 Cobb, 1920. 



Fig. 59. Axonolaimiis setosus Filipjev, showing the head. The vestibu- 

 lum and the mouth capsule are strongly developed; both 

 branches of the horseshoe-shaped amphid are closely 

 pressed together. After Filipjev, 1918. 



Fig. 60. Diplopeltis cirrhatus (Eberth), showing the horseshoe-shaped 

 amphid surrounded by a strongly chitinized plate. After 

 Filipjev, 1918. 



Order ANGUILLULATA 



Pl. 7, Fig. 61. Rhabditis elegans Alaupas. Note the elongate mouth capsule, 



the preneural esophageal swelling, and the true cardiac bulb 



with the masticatory apparatus. After Maupas, 1900. 

 Fig. 62. Rhabditis elegans Maupas, showing the spicules and bursa in 



ventral view. After Maupas, 1900. 

 Fig. 63. Rhabditis elegans Maupas, a side view. After Maupas, 1900. 

 Fig. 64. Diplogaster fictor Bastian, showing a dorsal view of the head. 



Note the folds of the lips, the teeth of the mouth capsule, 



and the amphids. After Cobb, 1914. 

 Fig. 65. Diplogaster fictor Bastian, showing the esophagus separated 



into two parts with the preneural and cardiac bulbs. After 



Cobb, 1914. 

 Fig. 66. Bunonema ditlevsetii ]\Iicoletzky. The mouth capsule and the 



esophagus are distinctly rhabditoid, the asymmetrical cutic- 



ular knobs and head appendages are very distinctive. After 



Micoletzky, 1925. 



