Etl-icorm in Poper-havgera' Paste. 301 



very small dorsal tootli and two subventral tooth-liko 

 pi DC-esses. 



"Esophagus with end-bulb in which is a valvular appa- 

 ratus. 



"Mules without bursa, with pre- and postanal papillaj ; 

 two equal spicules, and with a simple accessory piece. 



"Genital opening of the female geneially a little behind 

 the median position ; ^onad anteriorly directed, unilateral, 

 and possessing a backwardly directed ovarium, which opens 

 from l)ehiiid into the vagina and ap{)ears to tunction as a 

 receptaculuin seminis. Ovoviviparous. Tail-glands absent.'"' 



'J'here seems to be no doubt, in view ot" the excellent 

 unravelling work carried out by Stiles and Hassall on the 

 que.stion of nomenclature, that the name they propose for the 

 eel-worm from sour paste is the correct one, and I propose to 

 use it in this paper. 



The f(dlowing is an account of the chief points of interest 

 in the anatomy and structure of the worm : — 



Anguillula rediviva (Linnaeus, 1767), Stiles & Hassall, 1905. 



Synonym. Angtiillula glutinis (Miiller, 1783). 



AVorms in all stages of growth, from small larvae to large, 

 jnature, and sexually differentiated males and females, are 

 encountered at any time in the sour paste in which 1 have 

 grown them. For purposes of description I shall confine my 

 attention to mature males and females. These are small, but 

 not so small that they cannot be seen with the naked eye 

 when the surface of the paste is examined or when a small 

 quantity of the paste is diluted with water. 



The females are, on the whole, larger than the males, as 

 shown by the following measurements: — 



Females. — Length from 1040-1370 /i, average 1270 ft. 

 Breadth „ 52-GOAt, „ 57 /x. 



Proportion of length to breadth about 20 to 1. 

 Distance of vulva from anterior end, average 805 /x, i. e. 

 about two-thirds of total leniith from anterior end. 

 Males. — Length from i)50-1240/x, average 1090 /x. 

 Breadth ,, 38-52 /z, „ 44/*. 



1^-oportion of length to breadth about 24 to 1. 

 Spicules, }i;reatest distance from bitid tip to swollen head 



52-55 /Lt. 

 Accessory piece, length 25-28/4. 

 The head-end is alike in both sexes, so I will deal with 

 this first and then proceed to the sexual difterences. 



