REPORT ON THE POLYZOA. 23 



materially different from Celleporana radiata, Reuss, which I hope to refigure shortly 

 from better specimens than were available for Professor Reuss. 



Jullien ^ makes this the type of a new genus, Jolietina, but I cannot see that the 

 grounds he gives at all justify the creation of another genus. 



Diporula hastigera, Busk (PI. III. figs. 28, 29). 



Flustramorpha hastigera, Busk, ZooL Chall. Exp., part xxx. p. 136, pi. xxi. fig. 7. 



This is very closely allied to Diporula verrucosa, Peach, of the Mediterranean and 

 British seas, but instead of having the branches round they are compressed, and the 

 operculum, though similar in shape, has the thick band round the border diiferent. The 

 avicularian mandible ^ corresponds in these two species ; and I should see no reason to 

 speak of this as vibraculoid, since it seems that the vibracula have the base of the seta 

 unsjrmmetrical, with irregular projections for the attachment of muscles, thus allowing 

 the vibracula motions in various planes. Believing in this fundamental difference 

 between avicularia and vibracula, it does not seem that what Mr. Hincks^ calls a 

 vibraculoid appendage is anything more than a lengthened mandible, if we may judge 

 from the figure of the lower zooecium (fig. 3). 



The zoarium is ramose, with compressed dichotomous branches, rising from an 

 expanded calcareous base, and has no chitinous tubes. It is not clear what Mr. Busk 

 intended to include under Flustramorpha, since in the diagnosis of the genera he .says, 

 " lobes bordered, and loosely interconnected by chitinous tubes," which certainly does 

 not apply to this species ; but higher up on the same page he thinks it may be advisable 

 to include in one group those "with or without the flexible stem and marginal bundles 

 of tubes." 



As this cannot come under the genus as defined by Busk, and as Diporula was based 

 upon characters of importance, I have left it under Diporula, although believing that it 

 will ultimately be merged in Microporella. This is very abundant in some washings of 

 the dredge between Fayal and Pico, 50 to 90 fathoms. 



Microporella distoma. Busk. 



Lepralia distoma. Busk, Quart. Jour. Micr. Sci., vol. vi. p. 127, pi. xviii. fig. 1. 



Eschara distoma. Busk, up. eit, vol. vii. p. 66, pi. xxii. figs. 10-12. 



Adeonella distoma. Busk, Zool. Chall. Exp., part xxx. p. 187, woodcuts, figs. 56, 57. 



Habitat. — Madeira, 268 to 322 fathoms. Station 75, 450 fathoms. Washings of 



dredge between Fayal and Pico, 50 to 90 fathoms. Capri, 150 fathoms (A. W. W. coll.); 



Golfe de Gascogne {fide Jullien). 



1 Les Costulides, Bull. Soc. Zool. de France, torn. ix. p 8. 



2 The opercula and mandibles of Diporula verrucosa, Peach, are figured in my papers on the use of the opercula and 

 mandibles respectively. 



2 On the Polyzoan Avicularium, Ann. and Mag. Nat. Hist., ser. 5, vol. ix. p. 23. 



