NO. 6 CLASSIFICATION OF NEMATODES FILIPJEV 6l 



Fig. 42. Odontonema guido-schneideri Filipjev, a representative of the 

 Chromadorinae, with a Uttle spiral amphid placed far for- 

 ward ; the large tooth of the mouth capsule is characteristic 

 for a few genera. Note the anterior cephalic circle repre- 

 sented by papillae. After Filipjev, 1929. 



Fig. 43. Prochromadorella viridis (Linstow), with the amphid spiral 

 flattened to form a transverse slit; this genus and some 

 other genera of the Chromadorinae have three teeth in the 

 buccal capsule. After Filipjev, 1929. 



Fig. 44. Metachromadora macroutera Filipjev; the plain strong rings 

 of the cuticle are characteristic of all the Desmodorinae, 

 but the peculiar striation of the head only for a few of 

 them. After Filipjev, 1918. 



Fig. 45. Monoposthia mielcki Steiner; the plain rings of the Mono- 

 posthiinae are interrupted by rows of longitudinal crests or 

 spines; a desmodoroid parallel to Richtersia; note the 

 roundish amphid. After Steiner, 1916. 



Fig. 46. Ceramonema annidata (Filipjev) ; the four longitudinal crests 

 of the cuticle are like those of the Monoposthiinae ; the 

 much-reduced mouth structure and the horseshoe-shaped 

 amphid resemble those of the Draconematinae; the huge 

 rings of the cuticle are very distinctive. After Filipjev, 

 1922. 



Fig. 47. Epsilonema (f) cygnoides (Metchnikov). Note the peculiar 

 form of the body with its "neck" and the adhesive non- 

 tubular setae in the middle part of the body. After Steiner, 

 1916. 

 Pl. 5, Fig. 48. Draconcma cephalatum Cobb, a marine nematode of world- 

 wide distribution. There is not only a "neck," but also a 

 "head" ; the adhesive setae are tubular (one under a higher 

 magnification is shown right below), and are disposed in 

 two groups, on the head and in several preanal rows (four 

 in that genus). After Cobb, 1913. 



Order DESMOSCOLECTATA 



Fig. 49. Desmoscolex minutus Claparede. The huge secreted cuticular 

 rings are very prominent ; the disposition of the ambulatory 

 setae is peculiar to each species. After Filipjev, 1922. 



Fig. 50. Quadricoma reinhardi Filipjev, a species with 43 secreted 

 rings. After Filipjev, 1922. 



Order MONHYSTERATA 



Fig. 51. Theristus sentiens (Cobb), a general view of the female to 

 show the female genitalia with the straight ovaries charac- 

 teristic of the order, a, the ovarial part of the gonad; bj 

 the oviduct part (a and b are fused together) ; c, uterus 

 with an egg inside ; d, vaginal opening ; e, the rudiment of 

 the posterior gonad. After Cobb, 1914. 



