cobb: new nematode genera 



435 



DESCRIPTIONS OP TWENTY-TWO HEW SPECIES 

 PROPOSED AS TYPES IK CONNECTION WITH THE POREGOINC NEW GENERA. 



« 

 Part of the descriptive matter is given in key-form for the sake of brevity, 

 and for the purpose of exhibiting relationships not shown in the foregoing key. 



The following characters are held in common. Excretory pore .when present, just 

 behind the nerve-ring. Spicula arcuate,- strongly so in Triehodora . slightly so 

 In Nannonchus and Isonchus . 



NEW SPECIES 



-9 A. decalineatus 



-9 



-9- 



squafflosum 



cylindricus 

 radicicolus 



= d -9- 



'9 

 '9' 



'9 

 '9 



0. obtusas 

 T. obtusa 



N. galeatus 7 



18 

 14 



Striae 200 or less :contour crenate or serrate;head rounded. 

 'Lip region mobile;male never losing the spear. ~<S 



Xip region fixedimale losing the spear at final moult. "i^ 

 Striae iiOO-t-.or none , plain, (Exc. 16); contour ent ire{Exc.21 ) . 

 Tail broad.end rounded ;head rounded;lips not set off(Exc.l8). 

 form of tail cylindroid, at least in the female. 

 Wedian bulb i wide as neck;Post .bulb elongated-pyriform. -rf 

 Median " -f wide as neck; " " indefinite;Hd .continuous -rf-9 

 form of tail somev/hat hemispheroid . 

 Head expanded .armored with strong, chitinous framework. 

 Head not armored, continuous. 

 Post. half oesophagus cylindrical ,3/5 wide as neck. 

 Post. part oesophagus clavate .hardly half as wide as Nk. -rf 

 Tail more or less conoidjhead continuous; lips often set off. 

 Conoid .no part cylindroid : not acute . (Exc.9 ' s of 10). 

 Terminus slightly swollen;head rounded;lips not set off. 

 Ceph. setae 0;lips faint ,6( ?); spinneret conoid .obtuse. 

 Ceph. setae 6( ? ) ; subceph.4; lips huge, with terminal flaps. 

 Terminus not swollen. round ed( Exc. 21 ,22 ) ;Hd .rounded (Exc .9 ,11,13) 

 Dermal pores throughout the body;lips set off in 11 only. 

 Pores in lateral rows of about 100;tail convex-conoid. '9' 

 Pores in submedian rows of about 140; tall conoid. -<f-'9' 

 'DRrr7:al pores none. 

 Head with either setae or elaborate appendages. 

 Appendages 4 slender setae, i long as head is wide. '9 

 Appendages elaborate dorsal & ventral double "combs". '9' 

 Head naked;knomn d's with supplementary organs 

 Cephalic papillae 5, lips not set off by constriction. 

 Tooth minute, at base of tubular pharynx;tail conoid. '9 

 Tooth protrudable,its apophyses bulbed;tail conv-conoid ' 9 ' 

 Cephalic papillae 12;amphids very near lip region. 

 Labial region discoid, set off by deep constriction. '9' 

 Labial region not discoid. 

 Lips 5, region set off by a distinct constriction. 

 Oesophagus with small bulb near spear; tail conoid 

 Oesophagus strictly Dorylaimoid ; tail conv-conold. 

 Lips 0, region not set off by distinct constriction. 

 Pharynx a 5-ribbed cup; supplementary orgs.,fascicles -rf- ' 9 

 Pharynx a tubular spear-guide; " " not " -rf-'9 

 Conoid, then cylindroid: head rounded. 

 Oesophagus plain;spiral amphs .opp.base of pharynx, <; tail setiferous. 

 Setae 10, i long as Hd.is wide.cf supplementary organs 0. '9' N. granulosus 17 

 Setae 4, 4 long as Hd.is v/ide; supplementary orgs. tubular 'rf '9 A. monhystera 25 

 Oesophagus bulbed ;amphids elliptical; tail naked. '9 U.tenuicaudatus 19 



U.t enuicaudatus 19 

 T. pelluoida 26 



A. truncatus 11 

 H. pellucidus 21 



C. gracilis 24 

 W. capitatum 22 



C. nudus 16 

 porplexans 6 



D. texanus 9 



-rf- ' 9 ' 



N 



virginianus 12 

 japonicus 13 



radiatua 10 

 americanum 1 



The following previously described species are proposed as type species for four 

 new genera. These four species were first discovered and described by the writer, 

 and assigned, doubtfully, to existing genera. Later investigations render it ad- 

 visable to propose new genera for their reception, as follows: — . 



