II 



120 



REroRT — 1884. 



this Diachoris BusJcii.' It is very evident tlint the tubular processes 

 cannot be relied upon as generic guides ; both in the genus Chon::iipurii, 

 and also in 1) aohorin as now understood these tubular processes vary 

 considerably, as lias already been pointed out by Mr. Waters in the de- 

 scription of the species T). jiuti'llarin, var innUijunrla (Hry. IJay Xap.). 

 111. CllOuizoi'oiiA BuoNc.iNiAiMii, Aud. = Jjcpniliii, ibid. Husk, ' Crag 



Poly.' 4(», pi. vi. titf. i. ; Manzoni, ' JJry. Foss. Ital.''Jud cont. 7. 



pi. ii. fig. 'J = Mulliii' inbercnlitlit and JlnnK/in'drtii, D'Orb. 



' Pal. Fran^. Terr. Crut.' = r' Ueiiti'Hcltaridlituila rhdinhouhilin, 



D'Orb. = Le^yralia capitata, llss. ' Bry. d. Ost.-ung.' 21, pi. iv. 



fig. 7. 

 liangc. — Coralline Crag; Pliocene, Voltorra and Castrocaro (Manzoni); 

 Austro-Hungarian Miocene (Kcuss). Living, widely distributed in Brit, 

 seas. 



Family ^MiCRoroiiKf.LiDiK. 



Genus Monoporeli-a. 



General cliaraclcf. — Zooocia destitute of a membranous area or 

 aperture, and of raised margins; orifice arched above, with the lower lip 

 entire ; no special pores. 



This group is formed for species with a ^licroporellidan orifice, but 

 destitute of the median ])ore, wliieh is so striking a character of llio 

 genus ^[icroporella. It is difficult to believe that this structure has 

 no special significance; it is at least a much better duo to affinity than 

 mode of growth. If this bo so, the Mioroporellidaii form from which it 

 is absent may well be set apart as a distinct group.' 



Family XII. Mon'OI'Okei.mk.k. 



Mondimrvlla, Ilincks. 



Provisionally at least it will be better to keep the genus !MonoporelIa 

 apart from the Microporellida;. If (as seems probable) the special pore 

 of the latter is represented by the oral sinus of the ^Myriozoidn?, IMicro- 

 porella will have closer affinity with such forms as Schizoporeila than 

 with the present. 



\s yet the species of ]\Ionoporella described are but few, and wc 

 have hardly material for a thorough study of the type. — ' Ann. & Mag. 

 Nat. Hist.' ser. 5 vol. ix., p. 123. 



M. lepida 

 ' M. 710,1 nhjcra )>' Ann. & Mag. Nat. Hist.,' Feb. 1882, Uincks. 



M. albicans 



112. MoNOPORELT.A CRASSicAULES, "Waters, ' Quart. Jour. Gcol. Soc' 



vol. x.xxviii., p. 270, pi. viii. fig. 23. 



113. MoNOHOREiwT,\ CRAssATiNA, Waters, ' Quart. Jour. Geol. Soc' 



vol. xxxviii., p. 270. pi. viii. fig. 23. 



114. MoKOPOREM-A hkuktata, Waters, ' Quart. Jour. Geol. Soc' vol. 



xxxviii., p. 271, pi. vii. 



fig. 11. 



t>\ 



' Smitt's genus Escharipor.i (as far as I uuderstand it) is founded for Jliero- 

 porellidan forms with more than a sinpjle pore. But tlio physiolopical siji^nilicance is 

 the same, whetlior there be one or many, and the distinction seems to be unimpor- 

 tant ; so also are differcEces in the shape of the pore. — Ann. <$■ Mag. Sat. Hi»t. 

 July, 1881. 



\1 

 if 



b| 



