Bryozoa of the Bay of Naples. 201 
tubular border. The zoarium is cup-shaped, but very wavy 
and irregular. 
The large acute avicularia sometimes stand up at right 
angles to the axes of the zooecia. 
In this species this is rare; but erect avicularia occur abun¬ 
dantly on Retepora monilifera , and among the Lepralice there 
are several cases of avicularia being either horizontal or per¬ 
pendicular to the axis. 
Operculum : distal end rounded, proximal slightly rounded, 
0T millim. wide, 0 - 06 millim. long. The opercula of the 
two species of Retepora are nearly the same ; but this seems 
to differ slightly from the more solid form in suddenly con¬ 
tracting near the distal end. 
77. Myriozoum truncatum , Pall. 
Madrepores rameux dont les branches sont rondes noueuses, Marsigli. 
Hist. Phys. de la Mer, p. 145, pi. xxxii. figs. 154-156 (1725). 
Miriozoo , Donati, Della storia uat. mar. del Adriat. p. 55, pi. vii. 
(1750). 
11 Miriozoon or Pseudo-corallium album fungosum of Aldrovandus,” 
Donati, Phil. Trans, vol. xlvii. p. 107 (1750). 
Millepora truncata, Pall. Elench. Zooph. p. 249 (1766). 
Millepora truncata, Letter to Linnaeus “ On the Animal Nature of the 
Genus of Zoophytes called Corallina by J. Ellis, Phil. Trans, 
vol. lvii. p. 404, pi. xvii. figs. 1-7 (1767). 
Millepora truncata, L. Syst. Nat. 12th ed. p. 1283. 
Millepora truncata, Lamouroux, Expos, des Polyp, p. 47, pi. xxiii. 
figs. 1-8. 
Millepora truncata, Risso, Hist. Nat. de l'Europe, Mer, vol. v. p. 347. 
Myriopora truncata , Mich. Icon. Zooph. p. 69, pi. xiv. fig. 7. 
Vayinopora polystigma, Reuss, Die foss. Polyp, des Wiener Tertiar- 
beckens, p. 73, tab. ix. fig. 2. 
Myriozoum punctatum, Phil. Beit, zur Kennt. der Tert. d. Nordw. 
Deutschl. p. 35, pi. xi. fig. 13. 
Myriozoum punctatum, Reuss, Zur Fauna des deutsch. Oberolig. p. 50, 
tab. ix. fig. 2, and Bry. d. deutsch. Septarienthon, p. 190; Manz. 
I Briozoi fossili del Mioc. d’Aust. ed Ung. pt. ii. Denk. k. Ak. 
d. Wiss. xxxvii. 1877, p. 22, tab. xv. fig. 52, tab. xvii. fig. 55. 
Myriozoon truncatum, Heller, Die Bry. des Adriat. Meeres, p. 126. 
This is well figured by Donati in his Italian work, and also 
in the Phil. Trans. 1757, where, on p. 107, he describes the 
animal as “ slender at the tail, thick at the belly, and again 
slender at the neck, to which is attached a little cover.” 
Ellis, in the Phil. Trans. 1767, used this species as an 
argument in his letter to Linne for the animal nature of the 
zoophytes. His figures of the zoarium are very good; but the 
polypidehe speaks of as u a trumpet-like sucker,” and figures 
it thus extending out of the aperture, with the operculum 
moved out in advance of the polypide. 
The only difference in M. punctatum of Phil, and Reuss is 
