296 
ADDENDA ET CORRIGENDA. 
A.FF. The curved lateral lines of apertures resemble Retecrisina. At first it 
appears to differ from that genus by the crowded apertures on the front edge 
of the frond, but that arrangement is indicated in some zoaria of Retecrisina ; 
and this Bryozoan so closely resembles in structure the specimen of R.papyrac^a 
(d’Orb.) shown in this Catalogue, Vol. I. PL IX. Fig. li, that it may be 
included as a Retecrisina. The species differs from the Theonoids by having 
apertures scattered over the w'hole lateral surface of the fronds. 
3. recta (Hennig), 1894. 
Syn. ReticuUpora recta, Hennig, 1894. Bry. Sver. Krit. ii., Cycl. : Lunds 
Univ. Arsskrift, vol. xxx., Acta Physiogr. No. viii. 
p. 15, pi. i. figs. 11-13. 
Char. — Zoarium of regular network, with thin branches; the interspaces are 
quadrangular to hexagonal. Apertures in rows containing from five to eleven ; 
eleven rows in a width of 3 mm. Apertures -06 mm. in diameter. 
Histrib. — Senonian — Campanian : Balsberg. 
Afe. — Allied to R. ligeriensis (d’Orb.), but with larger interspaces and more 
apertures in the vertical rows. R. obliqna (d’Orb.) has a less regular 
meshwork. 
RETEC AV A, d’Orbigny, 1854. 
Vol. I. p. 187: 
o 
Spiridmonea, Hennig, 1894. Bry. Sver. Krit. ii., Cycl. : Lunds Univ. Arsskrift, 
vol. XXX., Acta Physiogr. No. viii. p. 12. 
This genus appears to me a synonym of Retecava ; but I only 
know it by Hennig’s description and two figures, which do not 
show anything generically distinct from Retecava. The translation 
of his diagnosis is as follows : — 
“Stem free, with a spiral twist, owing to the small, spirally 
arranged, laterally compressed branches ; the zooecial apertures 
occur on the upper sides of the branches, and have the arrangement 
characteristic of Idmonea, viz. the apertures are in transverse 
rows on each side of the middle line of the branches. The under 
sides of the branches, as well as the whole upper surfaces, are 
furnished with fine (refflor) ‘ reinforcement canals,’ and here and 
there with the pores that serve as the mouths of these canals.” 
Hennig’s type species of his Spiridmonea is S. lundgreni, op. cit. 
pp. 12, 13, pi. i. figs. 9, 10, from the Campanian of Balsberg. 
Its nearest ally among species of Retecava is R. lichenoides (Goldf.), 
which amongst other localities occurs in the Campanian of Biigen. 
