POLYCH.^TA OF PLYMOUTH. 635 



NiooLEA VENUSTULA (Moiitagii) ? de St. Joseph, Ann. Sci. Nat. Zool. 

 XVII. 1894, p. 207. Marenzeller, Sitzb. Kg. Akad. der. Wiss. zu 

 Wien, Bd. 89, 1884, p. 195. 



EnglIvSH Channel. Seven specimens obtained 32 miles S. ot 

 Start Point (40^3 fms.). 



Dredged by Crawshay at a number of stations S.S.W. of the 

 Eddystone at depths of 42-50 fms. (Crawshay, Joum. M.B.A., vol. 9, 1912, 



p. 343). ; 



These specimens from the deeper water of the Channel all have 

 17 bundles of bristles on each side. 



The difference between this and the next species [Nicolea zosteri- 

 cola (Oersted) Malmgren) is discussed by de St. Joseph and by 

 Crawshay {loc. dt. p. 344). N. venustula as described by de St. 

 Joseph has 17 setigerous segments, whereas N. zostericola as de- 

 scribed by Malmgren has 15 only. 



Mcintosh (Ann. Mag. Nat. Hist., vol. 15, 1915, p. 20) describes iV. venustula 

 as having 15 bristle-bundles on each side, which would make the 

 form described by him agree with N . zostericola. 



Fauvel (Result. Camp. Scient. Monaco, Fasc. XLVI. Annel. Polych. 1914, 

 p. 299) has found both the form with 15 setigerous segments and 

 that with 17 such segments. He considers them as the same species 

 and adopts the name N. venustula (Montagu). 



Nicolea zostericola (Oersted) : Malmgren, Nordiska Hafs-Annulater, 

 Ofer. K. Vet. Akad. Forh., 1865, p. 381. 



Plymouth. Common between tide-marks on Reny Eocks ; 

 less frequent on the north side of Drake's Island. Also obtained 

 from dredgings in Yealm River. 



This species has 15 bundles of bristles on each side, and so far 

 has only been recognised from the shore and shallow inshore waters. 

 For comparison with N. venustula see note to that species. 



Thelepus cincinnatus (Fabricius) : Marenzeller, Adriat. Annel. Sitzb. 

 K. Akad. der Wiss. zu Wien, Bd. 89, 1884, p. 205. 



Plymouth. Common on the trawling grounds in the neigh- 

 bourhood of the Eddystone (20 to 40 fms.). 



Obtained by Crawshay at a number of stations S.S.W. of the 

 Eddystone in depths of 40 to 50 fms. (Joum. M.B.A., vol. 9, 1912, p. 344). 



If the number of pairs of gills (gills on two segments) is taken as 

 the main character of the species, rather than the shape of the 

 uncini, which seems variable, the species most commonly met with 

 is T. cincinnatus, and not T. setosus, Quatrefages, as entered in 

 the former list. It is probable that T. setosus also occurs in small 

 numbers, but the matter requires re-investigation. 



Salcombe. It is doubtful whether the species found at Salcombe 

 should be assigned to T. setosus or to T. cincinnatus (Journ. M.B.A ,, 



vol. 6, 1900, p. 197). 



