74 MOLLUSCOIDEA—BRYOZOA SUB-KINGDOM V 
bo 
Petigopora, Ulrich. Small parasitic species having strong acanthopores but no 
mesopores, and only a few diaphragins, 

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; SS 
: t\R we os “sd 
Lakatos 
Fic. 455. 
Fic. 454. Dekayia aspera, Edw. 
Dekayella obscura, Ulr. Cincinnati, Ohio. Tangential and H. Cincinnati, O. 
and vertical sections, 14/; (after Ulrich). Tangential section, 14/). 
Family 3. Calloporidae. Ulrich. 
Zoaria ramose, sub-frondescent, massive, or discoidal. Zowcial apertures generally sub- 
circular and separated more or less completely by angular mesopores ; at other times poly- 

aay 

Fia. 456. 
A, B, Callopora elegantula, Hall. Niagara; Indiana. Vertical and tangential sections, 14/;. C, D, C. multi- 
tabulata, Ulr. Trenton; Minnesota. C, Vertical section, 7/;. D, Surface having zocecia open (7/;), and presery- 
ing zocecial covers (14/;). 
gonal, when the mesopores are few or wanting. Zoecial tubes thin-walled, attaining their 
full size slowly. Acanthopores wanting. Ordovician to Devonian. 
‘ 
In this family the proximal ends of the tubes arising in the axial or ‘‘immature” region 
have the character of mesopores. The diaphragms are rather closely arranged in the tapering 

Fia. 458. 
Fia. 457. . . 
; a Monotrypa magna, Ul. Lower Trenton ; 
Diplotrypa Westoni, Ulr. Cincinnati Group ; Manitoba. Illinois. Transverse and vertical sections, 7/) 
Tangential and vertical sections, 14/; (after Ulrich). (after Ulrich). 
proximal end, then few or wanting for a considerable distance, and finally become crowded in 
the peripheral or mature region. 


