1G7 



Genus STREBLOTRYPA. Ulkich. 



[Ety. : Strcblos, turned about; try pa, opening.] 

 (1890: Geo. Surv. 111., Vol. VIII., p. 403.) 



Brvozomii resembling Rhoinbopora in strnctnre and form, 

 but having angular pits between the ends of the apertures, 

 and irregular cells, or mesopores, in the inter-apertural 

 spaces. 



Streblotrypa hamiltonexse. (Nicholson.) (Fig. 51).) 

 (Pal. X. Y., Vol. YL, p. 191, PI. LY.) 



DistinguMiing Characters. — "Cells tubular, arising from a 

 filiform axis at the center of the branch . . . "' [This chai-- 

 acter would place the species under Acan- 

 thoclema (Hall), under which genus it was 

 described in Yol. YL, Pal. N. Y.]; oval cell 

 apertures in longitudinal parallel rows, often 

 alternating, sei)arated bv prominent loiigi- , fic^59. strMotrijf,,, 



f^ J- • I f^ hnmiltonense. Natu- 



tudinal ridges; ridges usually slightly sinu- enla'Sed''"^^ V^^after 

 ous ; two angular pits between apertures. ^^" and'simpson). 



Found in the "Hamilton group, West Hamburg, Erie 

 County, X.Y." (Hall.) Found also at Avery's Creek, in tiie 

 shale V)elow the Trilobite beds (rare). 



Gexus FISTULICELLA. Simpsox. 



[Ety.: Fistnln, pipe; rdhi, cell.] 

 (1894: 14tli Kep't N. Y. State Geol., p. 606.) 



"The manner of growth and general appearance is the 

 same as that of Lichenalia, but the cells are circular and 

 without ]iseudose})ta or lunaria." (Type 

 F.plamu Hall.) 



FiSTULICELLA PLANA. Hall. ( Fig. GO. ) 



(Pal. N. Y., Yol. YL, p. 215. PI. LYIH. ) 



Distinguishing Characters. — Thin, lam- 

 ellate ex|iansions, incrusting or free; cir- 

 cular apertures, regularly or irregularly 

 disposed; circular or elongate, depressed ^.^^ g^. F^suaiceiia 

 macuhe, without cells; adjacent ajiertures f^faportio^^ortlTsu"- 

 slightl V larger than those on general surface. I^uf simpsom" "' """^ 



