cobb: new nematode genera 443 



coronata. Flemming to glycerine. This species occurs in Fiji, Panama, Europe, 

 Africa, and the United States. Possibly more than one species may be repre- 

 sented in the descriptions of the various authors who have reported upon Rhab- 

 ditis coronata, or, as now proposed, Diploscapter coronata. 



21. Haliplectus pellucidus, n.g., n.sp. 



gg Head end markedly convex-conoid, 



/-— r, -5 . 7.3 11.6 '43' 95.2 ,x. mm. finally truncated: no cephalic se- 



^— °1.1 2.J 2^7 3.1 2.3 ^ ' ,, , . 



65 tae. Pharynx apparently absent, 



(;=0j^-^ I'l ■'■gle ~z~s ^I'.l '''■• ""• really present and narrow. Am- 



phids circular, one-third as wide 

 as corresponding part of neck; located one-third the distance to the median 

 bulb. Oesophagus one-half as wide as the head, to the relatively small ellip- 

 soidal median bulb, which is two-fifths as wide as the middle of the neck. 

 Cardiac bulb oblate, five-sixths as wide as neck, with rather simple, elongated 

 ellipsoidal striated valve. Opposite the spicula a ventral row of six small 

 somewhat hemispherical, equidistant, contiguous, innervated supplementary or- 

 gans. Post-anal flatfish, inconspicuous papillae to the number of about six on 

 each side, — -two ventrally submedian on the anterior half, and four subventral, 

 rather evenly distributed. Spicula arcuate, uniform, yellowish, one and one- 

 fifth times as long as the anal body-diameter; proximal ends plain. Accessory 

 piece yellow, more or less parallel, half as long. Hot sublimate to balsam. 



Habitat; distribution. Found in brackish and sometimes in fresh water in 

 the Eastern States. Several species found on the Atlantic and Pacific coasts of 

 the United States. 



22. Wilsonema cephalatum, n.g., n.sp. 



r— o 4...1 i7.../..-^„.28^ :s.2.' .??.t.™.>.3 mm. Habitat ; distribution. Genus proposed 



^ 3.9 5. 5_// 7-1 o-'i r 2^1 X- r • ■ -1 J. 



for the reception of species similar to 

 Plectus otophorus, de Man, Plectus auriculatus, Blitschli, and Plectus cephalatus, 

 Cobb. This genus is doubtless worldwide in its distribution. Known to the writer 

 from Australia, North America and Europe. Flemming to glycerine. Species 

 probably fairly numerous and individuals of certain species very widespread. 

 The present remarkable species is widespread in the United States, in arable 

 soils. 



Named in honor of James Wilson, for sixteen years Secretary of Agriculture 

 of the United States. 



23. Gymnolaimus n. g. exilis (Cobb) 



4.5 7.5 23. -46^"^ 73. i.07 mm. Habitat; distribution. Genus pro- 

 ^~ 1.6 1.9 2.1 2. 1. • posed for the writer's Aulolaimus 



exilis, from Fiji. Differs from Cylindrolaimus in absence of amphids, caudal 

 glands and cephalic setae. Measured fresh. 



24. Chronogaster gracilis, n.g., n.sp. 



Striae about 650. Lips three, 

 r ^1.5 11./ • 25. '56 89. ,1.2 mm. somewhat confluent. Amphids 



L^^ "^ 1.2 ' 2.3- 2.6 3. 1.6 1 in • 1 1, J T)U 



^ 4g half as wide as head. Pharyjmx 



r=-D^-^ . 12..1./. 2^.1. -M- . 92-.7 >i.i mm. ^s deep as the head is wide, one- 

 i. '^ .9 1.9 • 2^ 2.4 1.9 ,. , ., ,, ,• • 



third as wide as the up region. 



