CEPHALOPODA. 769 
Piloceras newton-winchelli.] 
are so large and have not been rendered more or less completely solid by the 
extravasation of organic deposits. 
.The second and less complete specimen of the species exposes a portion of one 
side (12 septa), toward the lower part of which, by cross fracture, the siphonal tube 
is 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 
sheath. The apex of this internal cast does not show satisfactory evidence of 
perforation. 
There are seven described species of Piloceras, six of which are recorded as from 
American faunas. All are of much larger size than P. newton—winchelli, and so far 
as known, have greatly broader siphones. All are from the early faunas of the Lower 
Silurian; Billings’ species P. canadense! from the Calciferous horizon, P. worthen:’, 
P. triton? and P. gracile’ (the last two but little known) from the Quebec 
group; P. explanator Whitfield’, from the Calciferous fauna of Vermont and New 
York (Fort Cassin beds), P. amplum Dawson,‘ from a corresponding horizon near 
Montreal, and P. invaginatum Salter’ (the type of the genus), from the Durness 
limestone of Sutherlandshire, Scotland, associated, according to Salter, with Orthis 
striatula Emmons (not Schlotheim), Ophileta compacta Salter, Orthoceras matutina 
Hall, and O. undulostriatum 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 is given as section 19, Union town- 
ship, Houston county. 
Collector.—N. H. Winchell. 
Museum Register, No. 2444. 
Genus 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, pl. v1, 1894.; - Its distine- 
tive characters are elucidated in the description of the species following. 
() Canadian Naturalist and Geologist, vol. v, p. 171. 1860. 
(2) Paleozoic Mossils, vol. i, pp. 256, 257, fig, 240. 1865. 
(3) Bull. Americun Museum Natural History, vol. i, No. 8, p. 323, pl. xxviii. 1886. 
(4) Canadian Naturalist. new series, vol. x, p.1. 1881. 
(5) Quarterly Journ. Geological Society, London, vol. xv, p. 376. 1859. 
(6) Twenty-first Ann. Rept. Geol. and Nat. Hist. Surv. Minnesota, p. 4, table. 1893. 
*Greek Nanno, a player upon the flute. 
+Nanno, a new Cephalopodan Type. 
