774 Transactions of the Society, 



XVII. — On the use of the Avicularian Mandible in the 

 determination of the Chilostomatous Bryozoa. 



By Aethur Wm. Waters, F.R.M.S., FX.S. 



(_Bead 10th June, 1885.) 

 Plate XIV. 



In a paper " On the Use of the Opercula in the Determination of 

 the Chilostomatous Bryozoa " * I pointed out the value of these 

 chitinous organs, and figured those of thirty-six species, of which 

 thirty-five were from the Mediterranean. This was really to be 

 looked upon as a supplement to my papers on the Bryozoa from 

 the Bay of Naples,t and in these latter I referred individually to 

 the figures of the opercula. It was almost self-evident that the 



EXPLANATION OF PLATE XIV. 



-Avicularian mandible of Flustra truncata L., Naples. 



„ „ F. armata Busk, Cape of Good Hope. 



„ „ F. foliacea L., Brighton. 



„ ,, Diachoris magellanica Busk, Naples. 



„ „ D. hirtissima Hell., Naples. 



-Operculum of Flustra truncata L., Naples. 



„ F. armata B., Cape. 



-Avicularian mandible of Schizoporella linearis Hass., Naples. 

 -Lateral avicularian mandible of Caherea Boryi Aud., Kapallo, Italy. 



X250&85. 

 -Anterior „ „ „ 9, „ 



-Avicularian mandible of Cellaria sinuosa Hass., Eoscoif. 

 -Operculum of C. sinuosa Hass., Roscoff. 



„ C. fistulosa L., Roscoff. 



-Avicularian mandible of C. fistulosa L., Roscoff. 

 -Operculum of Cnherea Boryi Aud., Rapallo. 

 -Avicularian mandible of Smittia Landsborovii Johnst. X 250 & 85. 



Naples. 

 -Avicularian mandible of ^eigjora ComcM Hincks. X 250 & 85. Naples. 

 „ „ Porella cervicornis E. and Sol., Naples. 



„ „ Umbonula verrucosa Esp., Capri. 



-Operculum of Cellaria Johnsoni Busk, Naples. 

 -Avicularian mandible of Cellaria Johnsoni Busk., Naples. 



,, „ Schizoporella unicornis Johnst., Naples. 



„ „ Smittia, Rapallo. 



„ ,, Smittia nitida var. ophidiana W., Naples. 



„ ,, Mucronella coccinea Abiltl., Naples. 



„ „ Schizoporella arrogata Waters, Naples. 



,, „ Diporula verrucosa Peach, Naples. 



„ „ Cellepora pumicosa Busk. (non. L.). x 250 & 85, 



Naples. 

 -Mandible of (small) avicularium of G. cronopus Wood, Naples. 



„ large (onychocellaria) avicularium of C. coronopus Wood, 



Naples. 



* Proc. Manchester Lit. and Phil. Soc, xviii. (1878) p. 8. 

 t " Bryozoa of the Bay of Naples," Ann. and Mag. Nat. Hist., ser. 5, iii. 

 (1879) pp. 28, 114, 192, and 267. 



