NOTES ON THE FREE-LIVING NEMATODES. 439 



Male with bursa and nine (in one case eleven) pairs of 

 papillae arranged in manner described above. Spicules 

 slender, with accessory piece. 



Synopsis of Clroup. 



(1) Bursa with nine pairs ot" papilla: D. longicauda 

 Chius. Bisexual species. Length of ? lOOO-loOO ^t; oesopha- 

 gus fairly long (one sixth to one seventh of whole length) ; 

 tail long (one third to one fourth of whole length), Germany. 



D. linstowi sp. n. Hermaphrodite species. Length of 

 hermaphrodite 1760//; oesophagus short (one ninth of whole 

 length) and tail short (one-seventh). Oviparous at first, but 

 soon became viviparous. Naples, 



D. maupasi sp. n. Hermaphrodite species. Length of 

 hermaphrodite 1024-1232 fx; oesophagus (one seventh to one 

 eighth of whole length), tail short (one sixth to one seventh). 

 Oviparous throughout life ; 150-300 fertile eggs always laid at 

 early stage of cleavage, and then about as many unfertilised 

 eo'u'S. Norfolk Broads. 



(2) Bursa with eleven pairs of papillte. D. robust us 

 Maupas. Hermaphrodite species. Length of hermaphrodite 

 2488^; oesophagus short (one ninth body length) ; tail very 

 short (one ninth body length). First oviparous, then vivi- 

 parous, after laying 150-230 fertile eggs. 



In addition to the sumniar}' diagnosis above the following 

 characters are distinctive of the two new species, 



Diplogaster maupasi sp.n. (Text-figs. 1. 4, 5, 6, 8). 

 Typical measurements of old i : 



Total Head to '^'^*' ^'^^ ^^}^ ^^ Anus to Length 



1 ,. , second bulb ot , ., ,. ^ 



length. vulva. oesophagus. ^^^^- ^* ^=•^• 



1232 /.t 608^(1) lo2^t(i) 176^t(i) 5-6 ^t 



Buccal cavity small, with three indistinct lips, each with a 

 slender seta, often distinguished with difficulty. Herma- 

 phrodite at tirst lays eggs at long intervals, more frequently 

 later. Males often fairly common. Spicules short, slender. 



