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130 iiKrouT— 1884. 



PuppoBod to iiulicato an! only in a ccrtiiin scnso corrocK Tlu! 

 olileT I'oi'iiis may, upon ('Xiiiiiinatidii, '^\\i^ cliaractfi's not fduntl 

 in vc'C'ont specit's — and (/■.• {-crxi!. 'I'liiis Sinitt (* Scandinavian 

 ]3i'y.') ^ivi's Husk's Alrt-ln rrpi'ii^ as Jh'dKlnjinrd il)id., witli the 

 fiillo\vin<7 additional synonyms Prulinsfiiiiit iHilintuuni^ U'Orli.j 

 /'. Toi'raciniia, D'Orl). 

 liauj,: -CO 



(lunus Tii;riJi(u;A, Lamarck. 



Ceriojiont, (pt.) llap;cjio\v ; I'lnthtrnji Ihi (sp.), Clray ; Ohel'ia (Hp.), 

 Lainx. ; lifjitofubiijerti, U'Orh. 



Znariiim adnatc or dcciunbcnt or subcrcet, forinin<jf a vavionsly sliapcd 

 expansion, cither entire or lnhatc, or brnnclied. Xnaciii, tubular, ])iir. 

 t:ally Ireo and ascending-, arranged in divergent scries,- -1 liiieks, p. -143; 

 I5iisk, ' Cyclostomata," lirit. :Mus. (ait.' pi. iii.p. 2-i ; ' Crag Pcdyzoa,' llU. 

 For additional synonyms. Husk, ' Cyclos,' ' ]}. Mas. Cat.' 



This genus I retcrred to briefly in my -Ith JJrit. A.ssoc. Report on 

 Fossil Polyzoa, as being ono ot" tlioso genera very poorly represented, 

 il'atall, below the Tertiary rocks. After carefully studying some very 

 iiiu! forms of the Tahalipovit, found amongst the Crag Polyzoa, and com- 

 paring theso with recent forms, 1 can fully endorse tho remarks on the 

 '/enus made by the Rev. T. llincks ('Jirit. ^Tarine Polyzoa,' p. 1 lil), 

 that the colony oi Tithiilipoi'a tu'igiuates in a discoid body, and that the 

 after development from this primary stage is by a ' .second cell,' usually 

 ])ent in the opposite direction ; ' followed by an increasing number of 

 series which diverge more or less on each side. In some cases a simpK 

 flabellato crust is thus formed ; in others it divides into lobes, which 

 again subdivide.' Although ii\ some respect f 'I'lihiiliparii may res(MnbIe, 

 on tho one hand Vlastdjtora, and on the other Stoinafupnrd, there is a 

 distinct facial character in tlie group which, under j)rc.sent circumstances 

 at least, keeps the genera distinct. It v.ould be lolly, hf)wever, not to 

 recognise that in the ^lesozoic rocks .sonu; of the JHnsldjinra ])reserve 

 tho flabellatc character until the colony is considerably advanced, but 

 these, instead of following tho lino of colonial development as found 

 in Taliuliponi, nltimately assume the norninl dis.oid habit and not the 

 branching and rebranching of typical Tnhulijiorit. The beautiful species 

 described as Tnhnlipurd jlnhi'llari", (':) Fal. (sp.) by ^Ir. J>usk in ' Crag- 

 I'olyzoa,' p. iii., and tiguretl pi. xviii. lig-. o, pi. xx. lig. !', is given by 

 !Mr. Hincks as T.fimhria, Lamk. ('Brit. Alar. Polyzoa, 'p. 1 tS). I have; 

 before me a very tine example of Busk"s species iigiired in pi. xx. fig. \\ 

 ' Crag Polyzon,' and I can therefore aece])t the strictures of Mr. lJinck.>^. 

 ■when ho remarks (p. 4 I'J) that T. Jiiiiltriu being distinguished by its flat, 

 fan-.shaped zoarium, difl'eis from the zoarium of T. jlul/i lliiri>!, in 'being 

 horizontal and destitute of the very tall sub-erect extremities.' The cells 

 are not arranged in series, or at all connected together. There is, how- 

 ever, an element of doubt in identifying the Crag form with the recent 

 T.y??/iZ/;-/(7, for the reason that I have been nnable to trace the ' trans- 

 vei'scly wriidvled ' aspects referred to by Air. Hincks. I shall not there- 

 fore differ from Afr. Hincks in his general appreciation of the types 

 accepted by him, bnt follow him in his identifications, in tho hope that 

 further study will throw some light at least upon tho doubtful points 

 referred to. 



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