272 ME. A. W. WATERS ON THE 



Observations on the Gland-like Bodies in the Bryozoa. 

 By Ahthue "Wm. Watees, F.L.S., F.G.S. 



[Bead 7th April, 1892.] 



(Plate XIX.) 



Ijt my Supplementary E-eporfc on the Polyzoa collected by H.M.S. 

 ' Challenger ' *, I referred (p. 27) to certain gland-like bodies t 

 occurring in a large number of species, and also to sacs difficult 

 to explain in the avicularian chamber of Lepralia margaritifera, 

 Quoy and Gaimard. It happened that the ' Challenger' material 

 of the species in which these structures were noticed was not at all 

 satisfactory for their exact study, nor would the time allowed me 

 for my work have permitted of many preparations. I have there- 

 lore since cut sections of all my available species, and as several 

 new points have turned up it seems best now to publish my 

 results even though they cannot be looked upon as complete, for 

 I have not yet been able to trace the early stages of these struc- 

 tures ; on the other liand, there seems reason for considering that 

 the suboral and avicularian glands must be considered as homo- 

 logous. 



The sections were mostly cut from specimens obtained from 

 Naples and preserved in spirit many years ago, but a few were 

 recently collected in Trieste. 



Aticulaeian Bodies. 



The avicularian glands are more pronounced in the Lepralia 

 foliacea to which I referred in the Ann. & Mag. Nat. Hist. ser. 5, 

 vol. iii. p. 124, pi. XV. fig. 8, than in the ' Challenger ' Lepralia 

 margaritifera. A similar gland occurs in the vicarious avicularia 

 of Hetepora cellulosa from Naples, in which species there are also 

 the suboral glands. In this case parenchym-threads at the base 

 of the gland pass to a rosette plate, thus connecting the avicularian 

 chamber with the next zooecium, and the other gland is joined in 

 a similar way with another zooecium (PL XIX. fig. 14). Thus 

 there is direct communication from the avicularium to two 

 zooecia, and we find that these parenchym-threads pass to every 

 organ of the Bryozoa. 



* Vol. xxxi. pt. Ixxix. 



t For the sake of brevity I shall refer to these merely as "glands." 



