454 F. W. GAMBLE. 



Distribution. — Faroe Islands (Schmidt). 



This species has hitherto only been seen by Schmidt, who 

 gave no account of the genital organs. He described the 

 form and colour, the position of the pharynx, and the eyes. 

 Excepting the difference in size (Schmidt's specimens measured 

 1'5 mm.) I have no reason for doubting the identity of my 

 specimens with his. 



As regards the systematic position of this species, my 

 observations are not perfectly conclusive. It is possible that 

 further investigations may prove that the organ R. s. is a 

 receptaculum seminis, and B. c. a bursa copulatrix, the trans- 

 verse markings I have noted being the subspiral muscles of 

 Jensen. At present, however, from the nature of the proto- 

 plasm, I believe it to be an ovary, while the presence of a 

 single genital opening is evidence for a position in the genus 

 Promesostoma, where v. Graff has already placed it doubtfully .'^ 



14. Promesostoma agile (Levinsen). PI. XL, fig. 14. 



Length '5 mm. Body oval, rounded posteriorly, tapering 

 forwards in front of the hinder third. Colour light red. 

 Movements very active. Eyes placed close together, tri- 

 angular, the apex being formed by the pigment-cup, directed 

 inwards and backwards, the lens outwards and forwards. 

 Pharynx subcentral. Intestine reddish, occupying the 

 space between the pharynx and the lateral yolk-glands. The 

 genital aperture is placed about halfway between the 

 pharynx and the posterior end. The testes are two oval sacs 

 behind the pharynx; they communicate by short ducts with 

 the penis, the base of which is spherical, and contains the 

 secretion of a granule- gland, while its distal portion is 

 produced into a long, narrow, slightly curved copulatory 

 organ. A pair of ovaries are placed at the posterior end of 

 the body, their ducts running forwards to the genital aperture. 



' A second genital pore might have easily been overlooked. If further 

 examination should demonstrate a second aperture, the species would have to 

 be transferred to the genus Bjrsophlebs. 



