NOTOMMATAD^E. 47 



certainly right in distinguishing them. Quite accidentally I have had the two in sight 

 at once, side by side, yet without the slightest mutual recognition, and thus had facilities 

 for comparison. ^Equalis has the body longer and slenderer, more taper, where 

 longiseta is gibbous, less divided into apparent joints by constriction, especially at the 

 foot, besides the co-equality of the toes in this. Yet, on the other hand, the gibbosity 

 of the former nearly disappears when extended in swimming, and then they are much 

 alike. 



I first saw this species together with F. longiseta, and both in some plenty, in water 

 from Woolston, in September 1885. Though the species showed no association, their 

 manners were exactly the same. The springs made by both and by Scaridium, with 

 which they have apparent affinity, depend, doubtless, on the length and elasticity of the 

 toes : and suggest a certain relation to the Triarthradce, and even to the order SCIRTOPODA, 

 in which, toes being wholly wanting, the same function is performed by special limbs, 

 long, taper, and elastic. P.H.G.] 



Total length, about T T inch. Habitat. Woolston (P.H.G.). 



Genus EOSPHOKA, Ehrenberg. 



[GEN. CH. Body oblong; head dilated and furnished with protrusile auricles ; 

 foot very distinct, with telescopic joints, and furcate toes ; eyes three, viz. one large, cer- 

 vical, tivo minute, frontal. 



Of the four species which Ehrenberg includes under this genus I know but the one 

 which he has not catalogued in its proper place, but which he subsequently mentioned 

 under the head of Diglena aurita. His words are : " Dr. Werneck sent me a drawing 

 of a new Eosphora, very like the Diglena of Berlin. I found, soon after, in the Berlin 

 animal, a pale red point on the opaque sac in the neck, which makes this an Eosphora, 

 if it prove to be an eye " (" Die Inf." p. 444). 



Judging by this species, there is little to distinguish Eosphora from Notommata 

 (proper), except the two minute frontal eyes ; ' and this distinction is evanescent, when 

 we remember in how many species of Notommata Herr Eckstein has seen frontal pig- 

 ment-specks. Yet, looking at the form of the trophi, I consider it intermediate between 

 Notommata and Diglena. P.H.G.] 



E. AURITA, Ehrenberg. 



(PI. XVII. fig. 14.) 



lyialena aurita ) 



Eosphora aurita . . . \ Ehrenberg, Die In/us. 1838, p. 444, Taf. Iv. fig. 2. 



, Gosse, Pop. Sci. Rev. 1863, vol. ii. p. 475, pi. xx. 



[SP. CH. Body cylindric ; head separated by a neck ; front slightly convex ; brain 

 an opaque globe at the end of a long slender tube; trophi forcipate ; foot slender, 

 cylindric ; toes slender, acute, furcate. 



This is an attractive species: its form is elegant and symmetrical, particularly when 

 the auricles are everted above the neck ; the slender foot and toes well finish the body 

 behind ; and the prevalent depletion of the viscera with bright pellucid green food, add 

 brilliancy of colour to the clear glassy vase. To the naturalist, too, it is specially 

 interesting. Far down in the body is a transparent ball, filled with opaque matter, 

 whence a slender tube extends right up the very front : this tube is more or less turbid 

 with like matter. On the ball just where it contracts to the tube is a broad and thick 



1 The frontal specks Dr. Leydig denies to be eyes, in the species aurita ; but I have no hesitation 

 in pronouncing them to bo strictly analogous with what we call eyes throughout the class. 



