1X2 Proceedings of the Royal Irish Academy . 



I have narrowed the above definition so that it excludes B. pollens and 

 B. norwegvca. It does not seem to me justifiable to include in one and the same 

 genus species which have a diffuse, and species which have a circumscribed, 

 sphincter ; or species which have six. and others which have twelve or more, 

 perfect mesenteries. B. poUens, which lias an extremely strong and peculiar 



umscribed sphincter, should go to a distinct genus, and might be called 

 L e j. »'_ -- bility which McMurrich has already (32) foreshadowed. 



_/;. . Pax, which is a minute but sexually mature species, with only 



six paii-s of pei: - can hardly be included in Bolocera. It 



agrees with Bolor- aides in bavin,' only six pairs of mesenteries, but whether 

 they have enough else in common, our knowledge ol - i- not complete 



enough to show. But it must either go to / les or to a new genus. 



XI),. hus limited, will contain: — />'. tuediae, the type; 



B.l B. ; B. : /-'. multipt 



i , 



I have seen and kept two living specimens which agree perfectly, except 

 for unimportant colour variation, with '■ ription of Bolocera eq 



wli: insidered a doubtful species. Although I have 



not yet fully in meiiB, I i that the species tques 



\- really an I'rti :' ilia), with weak verrucae, circumscribed endodermal 



t, I think, identical with 

 /■ but may perhapE be 30 with 



; go further into that question later, but 



my point is that Jocera. 



4. B. tuediae. 1 1 



(PL XIV. fig. 2; PL XX figs. 1. and 3 



( .1 . uid others.) 



SB. 338. 13. v. 06. Trawl. 291-330 fma. Lat. N. 51 28' 30". Long. 

 YV. 11 : 39*. »n. 



I. 0. v. 00. Trawl. 415-374 fma Lat N. 51° 16'. Long. W. 

 11- ~ en, which hat irly all its tentacles. 



The anatomy of this has not hitherto been ■ and its 



position therefore b ned a little uncertain I find in the present 



colli 2 I think may be certainly identified as B.tuea 



from the descriptions of Gosse, Johnston, at " . L. Walton, who 



has seen living specimen- species and of B.longworwU in the 



with me in this respect. 



• '», to release, and «c ( ..ui. a horn. This is founded, like the nanv itself, 



on the habit of shedding the tenta' 



