1):ito|)(>in itnd its AUief. ^5 



and oT Cadicas snpra Bonurra, Sardinia (\cv.) ; M:iztin('<;a, 

 Vcniiu'sc (./. //'. coll.). 



'I'liir (onus denlt with may he provisionally plac(!(l as folltjws. 

 It is a ■;ronp willi cri-ct, usiiiilly harn-l-^liapi'tl zoujcia : — 



I. With a pit tow.uila \%liicli tho zcKvcia are directed. 



1S«)7. lUroi'oiiA, K'.i. — Oml npcrturf small (Ol)!»mm.), noarly round, 

 but uxaiuiiuitiuii ^ho\vs otnti^lit lowur eil^'t*. I(i-ijiiuiii ite. I'liiiiiiry 

 smvirt liiddrii. Tvpf, B. «toliczkai, I{«'«. (probably juiiiif^ uf li. iiiultt- 

 radiiita, Ks-*.). 



1H()1. <>iuilTri.ll'Oii.\, Stoliczlca. — Ornl aperture lar^:*', with Btmi^fht 

 lawiT ed^ro. I'it at tin; »ide. IM-iuultilaytTed. Typ>", O. Iiaiiliiiijvri, 

 8t.)l. 



1891. SPH.*:noi'HOBA. Ila,swi'll. — Oral apnuture lar^t" (Ol'J mm.), 

 with .strai;rlit li)\v«'r odu<?. (Jrows in all directions t'nmi the early 

 touBcia. I'it rentntl. Mnlti-laininate. Type, .S'./bs/tr/. II ;i h well. 



1S."»J. STifUoi'oUi.NA, Stulic/.lui.— C)ral aperture .small. I ni-iaminalo 

 to bi-lamjuate ? fit central. Type, 6'. remit, .Stol. 



II. Usually without a pit. 



1873. M.vMii.i.ni"()n.\, Smilt*. — Oral aperture lar^e (() li' mm.), rcm- 

 tracted at each siile. Primary zoo-ciuni erect, surroui.ded by sjx simihtr 

 tooecia. Onl}' uni-laminale, showiii^r the position of the zo»eeia on tho 

 under surface. T^pc, M. cttpolu, Sm. lerliary fos.'^ils: .)/. nimple.v, 

 Kosch., M. biilentdtit, IIs.s., M . firofecta. Koscli. 



IS.'il. CoNESCHAiiKM.iNA, d'Orb. — Oral aperture very .omall, sliplit 

 sinus, opeivula with muscles ^ome little distance frimi the border, .semi- 

 luiiar slits. Cone uni-Iamiuar, filled in bylar-re cliHUibers. (To be dealt 

 with in the lar^rer paper.) Type, ('. (nii/uetafa, d'Orb. 'A species fo.ssil 

 from N. Italy ha.s lar^^a- pores round the apex, and one n« ar the centre is 

 lar];er and mi^ht be called a pit.) 



EXPL.VNATION OF V\.\TK \L 



Fig. 1. Sphtpruphora fusm, Ilnswell, X 10. Surface with a larjre ])it. 



The zocecia are shown directed toward.sthe pit. I'Vom liates- 



I'ord or Muddy Creek, fossil. 

 Fit/. 'J. Ditto. X 10. Section showing tbe pit. From Percy Island, 



recent. 

 Fi)/. .3. I)itti>. X 2o. Section of the pit, showing the pores leadiuf!^ 



to the zoa'cia. From Percy I.'-land. 

 i-Vy. 4. L'titojtura ttniUiradiala, Iteuss., X -5. Section showing the 



pit and the /.o<ecia in n second layer round the tiist. From 



near N'ovezzina, foj*.Hil. {a) x 2. Z<»arium showing a cap 



formed by a .-iecond layer of zoa>ci«. From Moutecchio 



Majigiore. 

 Fitj. /i.^Ditto. X about 10. llaso showing two circles of zooccia. 



This is the only specimen showing two basal circles clearly. 

 Fiy. 0. Ditto, x 25. Showing the pit with smaller zoa'cia round it, 



OS well as tbe ordinary zocecia. From Val di Lontc. 



* I hare published a figure of the operculum of Fedora edtrardsii, 

 Jull., in "North Ital. Hry.,"' Quart. Journ. Oool. Soc. vol. xlvii. pi. iv. 

 fttf. 7 : an<l Kirkpatrick has publislied one df M.aimplex, Kosch. I'roc. 

 U. Dublin Sue. n. .-. vol. \i. pi. x\ii. hg. I (1j*1K)). 



