374 VINE : POLYZOA AND MICROZOA OF YORKSHIRE AND NORFOLK. 
Genus Proboscina (Aiidouin) d'Orbigny. 
The Genus Proboscina is a convenient, rather than an essential 
division of the Stomatopora group. As defined and accepted by 
d'Orbigny, the genus looses much of its individuality, for many of 
his species have been variously located by other authors. Mr. Hincks 
says (Brit. Marine Polyzoa, p. 432) "I do not venture to identify 
Stomatopora expansa with d'Orbigny's Proboscina ramosa (= Idmo- 
nea cenomana d'Orb.) though it bears a strong general resemblance 
to it," while Tubulipora fimbria, Lamk. (op. cit. p. 448) = T. flab- 
bellaris Busk (Cyclostomata, p. 25) is identified by both authors as 
? Proboscina latifolia d'Orb. In working up their material, both 
Mr. Busk and Mr. Hincks disallow the genus for recent species ; the 
latter author bracketing the Stomatopora whose zoaria are partially 
erect and free, as the Sub-genus Proboscina Smitt. Stomatopm-a 
incrassata, Hincks, thus absorbs Tubulipora (Proboscina) incrassata 
Smitt, Alecto retiformis Hincks, and ? FiUsparsa incrassata D'Orb. 
From this it is manifest that unless the genus is more rigidly defined 
and limited, it would be impossible to accept it for the purposes of 
this memoir. By Reuss," and Novak,t and recently by Mr. WalfordJ 
Proboscina has been accepted as a kind of passage genus intervening 
etween Stomatopora and Diastopora. 
Jules Haime, in his admirable memoir on Jurassic Bryozoa, 
accepts Proboscina as a passage group, and he suggests that probably 
Cellepora echinata, Goldf. = Tubulipora echinata, Hag., and Sip/io- 
niotyphlus plumatus, Lonsdale, are really Proboscina species ; and 
Diastojyora ramosa, Mich. Lonsd. is undoubtedly another. Haime, 
in his monograph, cites other species, and these are probably Probos- 
cina Haime, = Idmonea (in part,) d'Orb. 
Mr. E. 0. Ulrich, in reviewing some of Prof. Nicholson's A kcto 
species,|| places two of them in the Proboscina group. Ihus Alecto 
confusa Nich. and Aulopora frondosa James, become Proboscina 
respectively ; and Mr. Ulrich remarks that the Silurian forms are 
* Bryozoen des Unteren Planers, in Geinitz's Ethalgel, in Sachsen, vol. 1, 
and Ibid, vol. ii. f Bryoz der bohmischen Kreideformation. 
i Quart. Journ. Geol. Soc, vol. xliii., and Ibid, vol, xlv. 
II Ann. Mag. Nat. Hist., Ser, iv., vol. xv,, 1875. 
