THE NAUTILUS. 21 
due to external causes ; probably nine-tenths, or more, of all collect- 
ing has been done during late summer and fall, since in spring and 
early summer the water is usually high, muddy and cold, and col- 
lecting is difficult, and in many places almost impossible. Now it 
is necessary that we overcome those difficulties and secure large 
numbers of muscles just in the time when the Lampsilis discharge 
their young and those under consideration become gravid. 
(To be continued.) 
DESCRIPTION OF A NEW HELIX. 
BY C. F. ANCEY. 
Helix disparilis Ancey. (PI. I, fig. 13). 
Testa imperforata, lenticularis, solidula, subnitida, carinata, su- 
perne et infra subtus carinam lzte fulva et maculis strigisque virenti 
luteis irregulariter conspersa. cirea regionem umbilicarem luteo- 
virens, concolor. Spira depresso-fornicata, convexa, valde obtusa. 
Anfractus 5, regulariter crescentes, perparum convexi, sutura lineari 
et superficiali discreti; embryonales lvigati, concolores, sequentes 
oblique striatuli, ultimus lineis impressis spiralibus confertisque, sub- 
tus presertim perspicuis striatus, eequaliter utrinque convexus, carina 
acuta mediana insignis, antice lenissime vixque deflexus, in umbilici 
loco impressus. Apertura perobliqua, diagonalis, securiformis, 
fauce pallidula, marginibus distantibus, callo tenui ad insertionem 
subincrassato junctis, supero antice rotundatim producto, declivi, 
obtusato, basali elliptico, subincrassato. Peristoma haud, nisi infra 
carinam expansiusculum. 
Diam. max. 173, min. 143, alt. 73 mill. 
Locality unknown. 
This is a very ambiguous and highly interesting shell. It is un- 
known to Mr. E. A. Smith of the British Museum, to whom it was 
submitted by Mr. John Ponsouby, of London. Its color is very 
striking, reminding one of that of Helix parilis Rang, while the 
form is nearly that of Helix Josephine, but it has no teeth on the 
peristome and the sculpture is peculiar. Notwithstanding its external 
facies, I however think the true affinities of this remarkable species 
are with Dendrotrochus Pilsbry, such as D. Cleryi, Eva, etc., and 
Mr. Ponsonby shares my opinion. The absence of locality is un- 
fortunate, as it would, perhaps, enable us to guess to what group it 
might belong. 
