THE NAUTILUS. 141 
G. lasmodon Phill. That so good a conchologist as Shuttleworth 
should have described a known species is readily explicable in this 
ease; “ H. lasmodon” having been described but a short time before 
in the proceedings of a society probably not in Shuttleworth’s posses- 
sion, it had not been figured and was not contained in any general work 
on the shells of America. However this may be, so good a diagnosti- 
cian as Shuttleworth could have used the words, “‘/ate et perspective 
umbilicata’”’ of no other species of the region, and the rest of the de- 
scription,* as well as the comparison with Patula, agrees excellently 
with /asmodon. This conclusion will remove macdlenta from the list 
of valid species and place it under /asmodon as a synonym. 
The gularis group of Gastrodonta is a peculiarly perpiexing one. 
Both gularis and cuspidata were originally described as imperforate ; 
but both have perforate forms also. G. gularis was described from Ohio, 
and I wiil be most grateful to anyone who has Ohio specimens, for a 
few. Shell out, brethren! Mr. Vanatta, who has recently overhauled 
the series in the Acid2my collection, informs m2 that he finds great diffi- 
culty in separating G. collisella from gularis, and it seems likely that 
that form should be ranked as a variety of gularés rather than a dis- 
tinct species. He finds, too, that there isa narrowly umbilicated var- 
iety (already noticed by Binney) and another with notably excavated 
base, consequently straight baso-columellar lip, and more or less defi- 
cient internal teeth. This was named by Mr. A. D. Brown in his 
collection (now in coll. A. N.S. P.); but pending a thorough exam- 
ination of the gu/aris group, it is scarcely fair to worry a long-suf- 
fering generation of conchologists with any names for these local races. 
The genitalia of the various forms should be examined. 
Polygyra postelliana subclausa, n. v. 
Differs from P. postelliana in the greater development of all the 
oral obstructions. The parietal process enters more deeply ; the upper 
lip-tooth is more deeply placed, more strongly hooked than usual in 
the typical form, and the apertural orifice decidedly narrower through- 
out, shaped like an interrogation mark (?) without the terminal dot. 
Surface regularly rib-striate, below as well as above. Whuorls 53 to 6. 
Alt. 5.7, greatest diam. 10 mn. Alt. 5, greatest diam. 9 mm. 
Bauldingsville; Baldwin, Baker county, and Imri, Hamilton county, 
Florida. 
A smaller form of this variety, smoother below, occurring in Volu- 
* A slightly inaccurate translation is given by Binney in Manual of Ameri- 
can Land Shells, p. 227. 
