NOTES ON THE FREE-LIVING NEMATODES. 441 



T y p i c a 1 111 e a s u r e m e u t s o f o 1 d i : 



Total Head to ^^'""^ t^, ^f ^ Anus to 



1 ,1 , second bulb ot ,„.i 



length. vulva. oesophagus. ^^'^■ 



1760 fx 840 ^((i) 200^1 (i) 240 ju (|) 



Buccal cavity large^ as broad as deep, with six papillar 

 lips, each with a slight seta not easily seen. 



Males with long and slender copulatory spicules and siout 

 accessory piece^ elongated and pointed distally (contrast 

 triangular piece of D. man pas i). 



Rliabditis Dnjardin. 



(1) R. gurneyi sp.n. (Test-figs. 9, 10). 

 Measure ni e n t s : 



XT T 4. Head to end of a „„ + 



T ;i Head to i i h i.- Anus to 



Length. ^ second bulb oi , •■i 



° vulva. 1 taii. 



oesophagus. 



Old herma- 

 phrodite 1456^i 709f.i (A) 243^ (i) 149// (i-yV) 



Diagnosis. — Hermaphrodite rather long and slender, 

 tail short. Lips of buccal cavity indistinct, with very minute 

 setie; buccal cavity narrow and deep. First division of 

 oeso})hagus thick. Vulva median. Hermaphrodite gland with 

 alternating production of spermatozoa and ova. Sperma- 

 tozoa of large size. Number of fertile eggs laid up to 800. 



Male unknown ; probably never produced. 



Locality. — In peaty soil, Longmoor Point, Sutton Broad, 

 Norfolk. 



(2) R. sechellensis, sp.n. (Text-fig. 3). 

 Measurements : 



TT IX Head to end of a„„„ +^ 



T i.1 Head to i i n ^* Anus to 



Length. , second bulb ot ,. -i 



° vulva. 1 tail. 



oesophagus. 



Old herma- 

 phrodite 680/t 344/t(4) 128/1 (i) 120/, (4 -i) 



A male measured 496/t in total length. 



Diagnosis. — Small Rliabditis of pale, transparent 



