166 



BULLETIN 100, UNITED STATES NATIONAL' MUSEUM. 



incompletely calcified ectooecium. which is again surrounded by avicularia. 

 (Levinsen. ) 



Genotype. Tegella (Membranipora) inii>rnh Fleming. l^- s . 



Ran fie. Santonian-Recent. 



The recent species of the genus are : 



Tegella (M etnbranipora.) unicornis Fleming, 1828. 



Tegella (Membranipora) */>/>/i!nt Busk, is.s.v 



'In (Membranipora) o<-<-\ilt,it,i Robertson. 1908. 



-av 



FID. 4(1. Genus 'l<n<ll<i Levinsen. JOO'.i. 



A-I. Ti ti<-tl<i iniirnniix Fleming. IsilS. A. < i\ u-i-llpil zooocia, X 50. (After Hincks, 1880.) 

 B, C. Two views, X 40, showing development f Hie avieularium. (After Levinsen, 1909.) 

 I>. /ooec-ia, X 20. E. Distal wall with uniiiormis s..],)\ib)c, >! 40. F. Lateral wall, showing 

 imiltii* innis septuple. X 26: nr. avioularivini : <, .mecinin. ;. Section through the ovicell, X 33; 

 i . avifularinni : f, f, septulae. H. Inferior face, . 10. I. A nmltiporous septula. greatly 

 magnified. (D-I after Levinsen, 1S94. ) 



The fossil species are: 



(M< 'iiilii'inii IKII-II } griffithi Bryrlone, 1906. 



(Membranipora) triminghainensis Bry<lone, 1910. 

 In reality in the fossil species the avicularium does not surround the ovicell, 

 but surmounts it and is intimately attached t<> it. 



TEGELLA ACULEATA. new species. 



Plate 30. IU. 11. 



The zoarium incrusts small shells. The zooecia are large, distinct, elongated, 

 jiyriform. with a long convex gymnocyst ; the mural rim is salient, very thin, 

 regular, with -t to 8 distal hollow spines. The oposium is anterior, oval, or elliptical, 





