277 



tonus jirc iiu'inhcrs of (he family ('ci-aiiiopoiiflMc Tlic twi'lvc tri'posloina- 

 tous fjenora are represeiitod l).v twenty-four species. The Bat()st(»ma. Hallo- 

 pora and Nicliolsonella are most ahmidant and appe.ii' in every loeality from 

 wiueii colleclions liave been made. Seven j;eneia and twelve species lielcnii 

 to tlie order ("ryptostomata. (;i-ai(to(iiclya. Kiuuidictya and i'lsciiaropora 

 are tlie most abundant in munber of specimens. 



Ridhij fiinna. Bryozoa in the Ridley limestone are not usually consiiicu- 

 ous. Orbi.iinyella occurs in many of tlie oviterops of tlie foiination. lint 

 .ijood collecting,' localities for tlie other forms are rare. 



Lchaiio)! fainid. In many localities bryozoans are abiuidanl. The ("ryp- 

 tostomata are most abundant in genera and species, buf the large Treposto- 

 matous forms are most eonspicnous. 



Arthoclcnia striatum Ulrich. Numerous species that are id(>ntical with 

 the Black River forms are found in the Lebanon formation. 



ChUHmatoporti siihtaj-a (ITlricli). This species is a loui,' ranged simple 

 cryptostomatous bryozoan. It is very abundant in the ['ierce beds and is 

 common in all other divisions of tlie Stones River. 



E'xcJKnoiiora hriarrii.^ (T'lricli), JJ. libaiid (Saffordi. H. nutiosa (I'lricln. 

 are common and cliaracteristic of the Lebanon formation. The forms in 

 the Pierce have been referred to E. fnu/iitdrix T'lrich. and I', couflnnin. which 

 are common in the Blaclv River of Minnesota. 



llclopora spiuiformis (Ulrich) is common in the Pierce. Ridley, and 

 Lebanon limestones. 



Numerous examples of Pachydictya resembling in all important features 

 the P. foliata of the Black River of Minnesota, are compared with that 

 species. It is abundant and grows slightly larger than the Minnesota forms. 

 Voriinotnjpa (Iclirdfntatu (James) is reprsented by numerous and well 

 preserved specimens in the IMerce and Tiebanon limestone. Corytriipa ten- 

 nesseetms Bassler is not so abundant as C. (telicidatd but man.v small frag- 

 ments of zoaria occur in the Pierce outcrop at Ward's Mill. Rutherford 

 County. 



Mitoclfmii riiiciosKni I'lrich occurs in many places in the Ridley lime- 

 stone and is abundant at Alin;iville, Tennessee. 



Batontoma IHiaiid (Saffordi was described by Safford in ls(i!) and is re- 

 described in this papi'r as a common and characteristic fossil of the Lebanon 

 limestone. lintoHtotiut xiihcnisum, new species, has not been described from 

 the ('hazy of New York but specimens in tli(> collections niaile by I»r. K. R. 

 ("uiinngs are .similar to the Tennessee species. 



Difiniililcx cf. pctroiKilitoiiK.s is very abundaid in the Ridley limestone and 

 is usually poorly iireserved. It is clo>ely related to />. /x IropnlitdHKs 1 >y- 

 Ix.woski. 



Hciiiiphruf/ma irrutsum (Ulricli) is abundant in the Pierce and Ridley 

 limestone. It shows slight variations from the Black River species of Min- 

 nesota but It is not thought advisable to suggest a new name at this 

 time. 



yicholsonclta pulchra Ulrich and N. frondifera new species, are tlie very 

 abundant ami most conspicuous trepostomatous bryozoa of the Stones River 



