NO. 1^42. JAMES TYPES OF BRYOZOA^BASSl.ER. 57 



STROMATOPORA TUBULARIS Jaroes. 



Stromatopora tuhvhirix James, Jour. Cinoinnati 8oc. Nat. Hist., VII, 1884, p. l;-{9, 

 pi. VII, %s. 3-3/;.— J. F. James, Jour. Cincinnati 8oc. Nat. Hist., XV, 1892, 

 J). 89. 



"Cylindrical or tuhuhir, liollow, 2 to '2,^ inches in diainctcr and 1 

 inch or more lon^-; laminae about onc-twenticth of an incli thick, 

 irrco'ular, wavy, vvitli serrate edg-es; interspaces thin; oscula at iri'eou- 

 lar intervals; central cavity of the tube filled with broken shells, corals, 

 or masses of clay, or sometimes entirely empty/'" 



The type of this so-called Sf7'omatoj)ora proves to be a portion of 

 the living- chamber of a cephalopod {OrthoceraH or Endoceraii)^ which 

 has become encrusted by successive layers of species of bryozoa 

 belonging- to the g'eruis CeranioporeJla. Some of these layers are of 

 Ceraiiiopo'Mla dlstiiirfa Ulrich, others are of C. grainih/m-nillfordensls 

 (.Fames), while vertical sections indicate that C. ohioeni'tis is also pres- 

 ent. The "serrate edges'"' of the ''laminae" are seen only in vertical 

 sections or fractures. This toothed appearance is caused by the pro- 

 j(»cting lunaria of each zoarial layer. The basal lamina of the succeed- 

 ing layer touches only a few of these projectigg |)oints, the others 

 remaining free. The "oscula" at irregular intervals are simply the 

 clay-filled borings of worms or other burrowing organisms. 



The type came from the Eden shale at Cincinnati, t)ut similar speci- 

 mens of incrusting Cerainoporella can be found throughout the Cin- 

 cinnatian rocks. 



STROMATOPORA LUDLOWENSIS James. 



Stroviatoporii ln(llowfin.ils Jame«, Jour. Cincinnati Soc.'Nat. Hist., VII, 1884, p. 

 140, pi. VII, fiKf^. 7, 111. — J. F. James, Jour. Cincinnati ^!oc. Nat. Hist., XV, 

 1892, f). 91. 



"Coenosteuni varying in outline and size 4i by 8 inches and 2^ 

 inches thick; sometimes parasitic, and then varying from one-tenth to 

 three-tenths of an inch thick; laminse irregular, undulating, fi-om 4 to 

 t) in one-tenth of an inch, including interspaces; transverse sections 

 show numerous circular or oval oscula (?) irregularly distributed; 

 surface irregular and rough, showing numerous minute pores and a 

 greater or less number of oscula."'' 



The "coenosteum" of this species instead of forming a tubular struc- 

 ture as in the preceding, grew into solid masses. Moreover, two sets 

 of "oscula" are recognized by its author, one of them doubtful. 



The type specimen is an irregular, solid mass composed of succes- 

 sively incrusting layers of Ceramoporella, O. distmcta Ulrich and O. 



« Abridged descriptioji by J. F. James, Jour. Cincinnati Soc. Nat. Hist., XV, 1892, 



p. 89. 



''Abri(lge(M('Scriptii)ii l»y J. 1"'. Junics, Jour. Cincinnati Hoc. Nat. Hist., X\', 1892, 

 p. 91. 



