BALOFODA 



I'ltiireru r 



.lie >n larire and have nut Keen rendered more or le^s completely -olid liy the 

 r\ti.i\ ,i-at Km of organic deposits. 



Tin- M-.'niid and less complete specimen of the species exposes a portion of one 

 -ide d'J septa), toward the lower part of whirl), liy rross fracture, the siphonal tul>e 

 i> left open and shows the terminal extremity of the internal solid cast of one of 

 the siphonal chambers and a considerable portion of another later and enveloping 

 -heath. The apex of this internal cast does not show satisfactory evidence of 



ration. 



There are seven -leM-ril.ed .species of Piloceraa, six of which are recorded as from 

 American fauna*. All are of much larger size than /'. nrtrton-winchelli, and so far 

 as known, have greatly broader siphones. All are from the early faunas of the Ixwer 

 Silurian: Hillings' species P. cunadense* from the Calciferous horizon, P. wortheni*, 

 /'. tritnn* and P. gracile 1 (the last two but little known) from the Quebec 

 -roup: /'. explanntnr Whitfield 3 , from the Calciferous fauna of Vermont and New 

 Y'ork (Fort Cassin beds), /'. nnplutn Ihiwson. 4 from a corresponding horizon near 

 Montreal, and /'. invayinaluni Salter 5 (the type of the genus), from the Durness 

 limestone of Sutherlandshire, Scotland, associated, according to Salter, with Ortln's 



</'/ Kmmons (not Schlotheim), Ophilela compacta Salter, Orthoceras mufufimi 

 Hall, and 0. Hmlitlostrin/nni Hall. 



The Shakopee formation of Minnesota is regarded by professor Winchell as 

 probably equivalent in part to the Calciferous sandstone of eastern North America*. 



formation and locality. The locality of the specimens described IB Riven as ftectlon lu. I'nlon town- 

 Hiiiistun rniinty. 



CWIw/or.-N. II. Winchell. 

 Miueum Reginter, N .'ill 



nus NANNO,* gen. nov. 



This genus has been briefly described by the writer in a preliminary notice 

 published in the American Geologist, vol. xiv, pp. 205-208, pi. vi, 1894.f Its distinc- 

 tive characters are elucidated in the description of the species following. 



anaiB Xaturallil nd (ioolocUU ml. T. p. J7I. 1MB. 

 I'alvoiote FVMll*. vol. i. pp. tat. 7 flit. tn. IMS. 

 (I) Boll. AmeHeu Mweuin Natural Hl.u.rjr. T<I|. I. NK. . r :CJ. pi. xnrlll. 1*W. 



.inmdltn NaturalUu new MriM. v,,l \. { , I. IMI. 



(S) yumrl.-r;/ Junrn. Oeolofie*! 8ocl' : Ot. 1MB. 



() TwrDtr-flmt Ann. Kept. Ueol. D<I ' IMI 



wk .V.inn... a plajrrr poo 

 .ii". m nfw '.Vplialopodan T;pp. 



40 



