250 MK. J. W. GEEGOEY ON THE 



Goncecia irregularly scattered. Orifice much restricted, either at the margin or by 

 the central calcareous plate, the knob of which has a small central pit. 



Distribution. Barton Beds, Barton. 



Type. Brit. Mus. No. 49733. Edwards Coll. 



Figures. PI. XXXI. fig. 5. Part of zoarium of the type. Fig. 6. Basal zooecia. 

 Fig. 7. Part of a large specimen (B. M. No. 49757) showing goncecia. 



Remarks on the Genus. This is a Lepralidan with a simple orbicular aperture and 

 thickened iieristome, and goncecia instead of external marsupia. The last character as 

 well as the form of the aperture distinguish it from Lepralia ; the absence of a 

 secondary orifice separates it from the Smittidse. 



Affinities of the Species. The nearest ally of T. clavata is a specimen from the 

 German Oligocene, described by Stoliczka [No. i, p. 87, pi. ii. fig. 8] as Eschara crenor 

 tula, from which it differs by its plain margin. Eschara semituhulosa (Eeuss) [No. 1 1, 

 p. 272, pi. xxxiii. fig. 3] probably also belongs to Teichopora, though in the absence of 

 knowledge as to the ocecial characters one cannot be quite sure : the greater length of 

 the zooecia and the more uniform width of the Austrian species clearly distinguish 

 it. Mr. Waters has suggested that E. semituhnlosa is a synonym of Eeuss's earlier 

 species, E. syringopora [No. i, p. 68, pi. viii. fig. 23, and No. 1 1, p. 269, pi. xxxii. fig. 1] ; 

 but in the latter the orifice is smaller, the zooecia expanded below, and the front wall 

 has a long furrow instead of being tumid and solid. Mr. Waters's own figures [No. 12, 

 p. 20, pi. iii. figs. 2-4] more resemble the English species, though the different nature 

 of the closure, the general form of the zocecia, and the proportions of the orifice show 

 them to be distinct. 



Amongst other species that will probably prove to belong to this species are Eschara 

 stipitata (Reuss, MS. Manzoni) [No. 3, p. 60, pi. xii. fig. .3], and Eschara sulcimargo, 

 Eeuss [No. I, p. 58, pi. v. fig. 18]. 



Genus MeniscoporaI, n. g. 



r 

 Diagnosis. A genus of Lepraliidse with a simple primary orifice, usually biconvex in 



shape, with the lower margin a much flatter curve than the upper. Goncecia and no 

 external marsupia. 



Affinities. This genus differs from Teichopora by the shape of the orifice and the form 

 of the zocecia. From most other Lepraliidse it differs by the presence of goncecia ; when 

 this cannot be determined, it may be distinguished from Lepralia (sensu stricto) by the 

 form of the aperture, and from Umbonula by the absence of the umbo : these are the 

 two genera which it most resembles in general aspect. 



From /iijct'o-Kos, a lune, referring to the shape of the orifice. 



