ADDITIONAL L.M.B.C. TUEBELLAEIA. 163 



Graff's figure of P. ovoideum (Monogr. Tab. vii., fig. 11), 

 but not extending right to the anterior and posterior ends 

 of the body, and thinning off between the eyes ; in the 

 other specimen it was altogether more diffuse. Length 

 of both specimens '6 mm. 



Promesostoma agile (Levinsen). 



New to L.M.B.C. District. 



I obtained seventeen specimens of this worm among 

 seaweeds collected at low tide on Port Erin Breakwater. 

 They varied from "35 to *6 mm. in length. Colour, light 

 red. The penis was in most of my specimens more 

 strongly curved at the apex than it is in Gamble's figure 

 (3, pi. xl., fig. 14), in some few it is even more so than in 

 Levinsen's sketch (10, Tab. hi., fig. 5), but it is evident 

 that this feature is one that varies. 



I have in vain tried to make out the relations of the "re- 

 ceptaculum " in this species, the organ is visible behind the 

 atrium in all specimens, and has a club-shaped appearance, 

 but I can find no connexion between this structure and 

 the other genitalia, nor am I quite clear as to the normal 

 position of the genital atrium itself. These points can 

 only be cleared up by the study of sections. 



Very typical of this species are several very large 

 granular salivary (?) glands, with ducts which converge 

 just behind the pharynx, they do not seem to have been 

 observed before. 



Byrsophlebs intermedia, v. Graff. 



Common on Cladophora collected in tide-pools near the 

 biological station. 



Proxenetes flabellifer, Jensen. 



One specimen among Cladophora, in a rock-pool near 

 the station. 



Mesostoma neapolitanum, v. Graff (PI. V., fig. 1). 



New to L.M.B.C. District. 



