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, leuticularis, solidula, subnitida, carinata, su- 

 perne et infra subtus cariuam Itetefulva et rnaculis strigisque virenti 

 luteis irregulariter conspersa. circa regionem umbilicarem luteo- 

 virens, concolor. Spira depresso-fornicata, convexa, valde obtusa. 

 Anfractus 5, regulariter crescentes, perparum convexi, sutura liueari 

 et superficial! discreti ; embryonales kevigati, concolores, sequentes 

 oblique striatuli, ultimus lineis impressis spiralibus confertisque, sub- 

 tus pnesertim perspicuis striatus, sequaliter utriuque convexus, carina 

 acuta mediana insiguis, 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. 17?, min. 14?, alt. 7? 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 Ponsonby, of London. Its color is very 

 striking, reminding one of that of Helix parilis Rang, while the 

 form is nearly that of Helix Josephines, 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. 



^>^ 



/& -' y&^& \C\ 



