47 40 Proceedings of the Royal Irish Academy. 



but it does not attain the enormous length of 18-20 mm., as de Saint-Joseph 

 states. Elwes gives 2 mm. in one place, and 18-20 mm. in another. In the 

 Irish specimens the length did not exceed 4mm. 



The species described by Marenzeller (torn, cit.) as Autolytus vemlli (the 

 Stephanosyllis ornata of Verrill, and the Autolytus Alexandra of Malmgren) 

 seems to he closely allied to, if not identical with, this species. The proboscis, 

 which has a single loop, is crowned with 9 large teeth, each pair being 

 separated by 2 small teeth, in the latter respect greatly resembling some 

 of the Irish specimens. In other respects the two species agree. For 

 instance, the epaulettes behind the head, which Marenzeller describes, though 

 not mentioned by de Saint-Joseph or Mcintosh, are present in the Irish 

 specimens. 



If Marenzeller is right in identifying his species with the A. Alcxanclri 

 of Malmgren, then this is the correct name for the species, otherwise the 

 name of de Saint-Joseph has priority. 



Habitat. — Blacksod Bay — In Laminaria roots on the shore. Clew Bay — 

 Dredged in Inishlyre Harbour in 4 fms. 



Distribution. — British Isles (Dublin Bay, Torquay) ; France ; ? New 

 England ; ? Spitsbergen ; ? Greenland. 



Autolytus rubropunctatus (Grube). 



1860. Sylline rubropunctata. Grube, p. 87. 1875. Autolytus (Pro- 



ceraca) ornatus. Marion and Bobretzky, p. 44. 1879. P. r. Langerhans, 



p. 579. 1886. A. o. de St.-Joseph, p. 220. ? 1908. Sylline rubro- 



punctata. Mcintosh, p. 186. 



It is difficult to understand what species Mcintosh had under examination 

 when he drew up the description of Sylline rubropunctata (torn. cit.). The 

 coloured illustration and the description of the colour pattern agree exactly 

 with Autolytus rubropunctatus (= A. ornatus); but he states that a ventral 

 cirrus is present on each foot, and figures the setae with simple tips. In 

 the true A. rubropunctatus the ventral cirrus is undoubtedly absent and 

 the setae are bifid, as described by other observers, and as I have found 

 in numerous Irish specimens. Moreover, Mcintosh states that his species 

 is the same as that found by Grube, Marion and Bobretzky, Langerhans, 

 Malaquin, and de Saiut-Joseph. It seems probable that Mcintosh has 

 confused two distinct species when drawing up his description. 



Habitat. — Clew Bay — Dredged in 7-10 fms. Ballynakill Harbour — 

 Dredged on two occasions, in 2-8 fms. 



Distribution. — Plymouth ; France ; Madeira ; Mediterranean, 



