248 The American Geologist. October, 1900 
more abundantly than anywhere else in the state. A very 
large chert cast has an extra piece in the anal area, a small 
diamond shaped plate, resting in a triangle made by the upper 
outer edges of the radials and extending upward as an elong- 
ate triangle along the middle of the anal interradial. 
P. burlingtonensis does not occur at Louisiana and its gen- 
uineness as a distinct species is doubtful. It is probably a ro- 
tund P. elongatus. 
Granatocrinus? pisum accompanies C. melo throughout 
its range but is never abundant. Its chief characters are its 
concave interambulacral areas, narrow, prominent ambulacra, 
width of the basal region and minuteness of the granular 
ornamentation. The chief departure from the above specific 
characters is the rotund variety wherein the interambulacral 
areas are f^at or convex. Granatocrinus exiguus is probably 
nothing more than a strongly marked variety of G. pisum. It 
occurs at Louisiana from the base of the Lower Burlington 
to the top of the 4th division and is a very handsome species. 
Codonites?inopinatus occurs very sparingly throughout the 
I St, 2nd, 3rd and 4th divisions of the Lower Burlington and 
mav be readily recognized by its strong linear ornamenta- 
tion, very convex base, the interambulacral elevations at the 
top of the fork pieces and the sharply elevated margins of 
the anal opening, suggesting the probable possession of a short 
proboscis. It is our handsomest species and one of the 
rarest forms at Louisiana. 
Granatocrinus aplatus is found in the top of. the 5th and 
throughout the 6th horizons of the Lower Burlington, but 
most plentiful in the earthy layer between these two horizons. 
Its conspicuous characters are its flat base, strong toothed 
ornamentation, prominent elevation of the anal interradial 
about the anal opening and its elliptical spiracles. The pos- 
terior spiracles of this species are not confluent with the anal 
opening as originally supposed. One variety of this species 
simply has linear ornamentation while another is elongate and 
differs much from the typical form, which is almost roimd. 
This species is congeneric with Codonites? inopinatus and 
l)robably G.? neglectus, which is not recognized among our 
forms. Aplatus varies in size from specimens scarcely larger 
than a radish seed to those as big as a medium size pea. It 
probably had a short anal proboscis. 
