ON THE ANGUILLULID.E. 117 



tides, tessellated. AmiSY^^" from posterior extremity. Vulva slightly anterior to 

 middle of body. 



Hale ratlier shorter, more slender, and transparent breadth being wka"- -^^^s xra" 

 from posterior extremity. Spicules curved, rrrr" 'i-ong. Accessory portion well marked. 



Kali. With Diatomaceae from the decaying lower leaves of Myrlophyllmn verticil- 

 latum, pond, Bagshot. 



Has a habit, when touched, of straightening itself, and remaining perfectly still for a 

 few seconds. 



2. D. ALBUS, n. sp. (Plate X. figs. 74, 75.) 



Female, length ^", breadth 3^". 



External Characters. — Body white, rather stout, tapering very slightly forwards, but 

 considerably backwards, where it terminates in a short filiform extremity. Head bluntly 

 rounded. Integument having longitudinal and transverse striae. 



Pharyngeal cavity large, cup-shaped, with valvular plates at bottom. (Esophagus ^th 

 of total length, having the usual median swelling ttto" long. Intestine slightly covered 

 with light-coloured fat-particles. Amis yg-g-" from posterior extremity. Vulva in 

 middle of body. 



Male, not seen. 



Sal). About rootlets of wheat from sandy soil, Broadmoor, Berks. 



3. D. FiLiFOUMis, n. sp. (Plate X. figs. 76-78.) 



Female, length ^i", breadth Tom'- 



External Characters.—Body white and very slender, tapering very slightly anteriorly, 

 but very considerably behind, where it terminates in a long filiform extremity. Integu- 

 ment with longitudinal striae Tuhru"> ^^^ transverse irooou' apart. 



Pharyngeal cavity cup-shaped, with horny plates at bottom. (Esophagus about ^th 

 of total length, with usual swelling of mid portion. Intestine covered sparingly \vith 

 light-coloured granules. Anus -^" from posterior extremity. Vulva at middle of 

 body. 



Hale, length -:^^", breadth ^ ^5 „ ". 



Anus xio" fi'oui posterior extremity, which is longer than in female. Spictiles could 

 not be detected, though the genital tube could be readily seen in front of the anus. 



Sab. Same as last. 



I could detect no sucker with the microscope, though I feel confident that such a 

 structure, however minute, must exist, since I have seen the male of this species swaying 

 violently about in all directions, the extremely fine extremity of thread-like tail only 

 remaining in a fixed position, 



4. D. MICANS, Max Schultze. 



V. Carus's Icones Zootomicse, tab. viii. 1. 



No description or reference. 

 Sab. Unknown. 



