714 MR. F. F. LAIDLAW ON THE POLYCLAD [June 19, 



PaOSTHECEEiEUS KUBROPUKCTATUS Lang. 



Prosthecerceus ruhro2nmctatus~La,\\g [1884] p. 562, Taf. vii. fig. 5. 



" From the bottoms of lighters, along with Stylochus." (12.) 



" A very beautiful species." 



Four specimens, one of them very young. 



Length of larger individuals about 13-14 mm.; breadth 6" 7 mm. 



Oligocladus sa^'Guinolextus (Quatrefages). 



Oligodadiis sanguinoUntus Lang [1884] pp. 580-582, Taf. viii. 

 fig. 7. 



" From amongst nodules of nullipores {Lithothamnion) 

 dredged in St. A^incent Harliour, 5-10 fathoms." 



A number of specimens. (2. W. 7.) 



Prosthiostomid.e. 



Prosthiostomum dohrnii Lang. 



Prosthiostomum dohrnii Lang [1884] pp. 601-603, Taf. v. fig. 2. 



Sevei-al specimens. (4.) " Amongst nullipores at low tide, and 

 at 10 fathoms, St. Yincent." Ribbon-like, of a translucent 

 yelloAvish colour, with distinct round spots of a darker tint on 

 the dorsal sui"face, most numerous medianly. About 2 inches long- 

 when fully expanded. 



Prosthiostomum sp. 



One specimen " from nullipore of Bird Rock, St. Yincent 

 Harboui'. It is remarkable that so delicate a creature should live 

 in a place exposed to the whole force of the Atlantic rollers." 

 (W. 13.) 



The specimen is very small, onl}' 7"5 mm. long. It has the 

 terminal male apparatus developed and the vesicula seminalis full 

 of spermatozoa. There is no appearance of ova, though the 

 position of the female aperture is indicated by the clearly visible 

 shell-glands. There are very few rather lai^ge eye-spots over 

 the brain, and some smaller marginal ones arranged very much 

 as in the young specimens of P. siphuncidus figured by Lang. 

 Perhaps this specimen should be referred to that species, but as 

 I have neither seen any mature specimens of P. siphtmcidus from 

 this locality, nor have any intermediate stages of P. dohrni 

 with which to compai'e it, I think it best to leave it without a 

 definitive name. 



DiPOSTHIID.E. 



Trauxfelsia eloxgata. sp. n. (Plate LII. figs. 4-5 and Text- 

 fig. 113.) 



" From sandy shore among weed. 



" Yermiform, thin, flattened; about 1| inches long by ^ inch 

 broad, but can contract to half this length. Resemblance to a 

 worm enhanced by the presence of a pair of slender tentacles 

 carried at right angles to the body. Ground-colour white, but, 



