442 FLORENCE BUCHANAN. 



genera together into one genus, as I have been able to compare 

 one species of Eupompe (E. australiensis) which was in 

 the British Museum with a type specimen of Polyodontes 

 maxillosus which Professor Bell kindly procured for me from 

 Naples. Although the last-mentioned worm has been several 

 times described, none of the figures of its head show very well 

 the relations of the tentacles to the prostomium, and I have 

 therefore figured the head from above and below (figs. 9 and 10). 

 The remaining species of the Acoetidse (Eupanthalis 

 Kinbergi, Euarche tubifex, and (?) Panthalis nigro- 

 maculata, and (?) part of P. bicolor) I would place pro- 

 visionally, but only provisionally, in a third genus, which 

 would bear the name Eupanthalis, defining it as follows : 



3. Genus Eupanthalis. 



Acoetidse with sessile eyes, four in number; three prostomial 

 tentacles, except (?) in E. tubifex;^ otherwise like Polyo- 

 dontes. 



Although it seems simplest to make one genus for all the 

 sessile-eyed forms, I have a good deal of hesitation in doing so 

 on account of Grube's description (9) of what he calls two 

 forms of Panthalis bicolor, coming, by the way, from the 

 same locality as the specimen sent by Mr. Cornish. Grube's 

 two specimens agree in colour, and the parapodia are alike ; 

 moreover he found them in the same bottle, which he seems 

 to think important. But while in the one the eyes are 

 pedunculate and apparently anterior, the palps very large, 

 the paired tentacles beneath the median one and the elytra 

 large, in the other the eyes are sessile, the palps shorter, the 

 paired tentacles on the front margin of the prostomium and 

 the elytra much smaller. Grube has already remarked that it 

 would be very strange and quite unheard of in this family of 

 Polychsetes to find such very different forms of a single species, 

 and he is not quite convinced of it himself. If it were so it 



* Mcintosh's remark that there is " no " median " tentacle in the spe- 

 cimen" seems rather to imply that there may once have been one which has 

 been lost by accident. 



