THE NAUTILUS. 115 
lection. Of these rarest species Martesia smithii [Martesia car- 
ibaea] is the only one now in the Am. Mus. (local) collection. 
Davis, W. T., Variations of Mya arenaria on the shores of 
S. I., Nat. Sci. Ass. of S. I., Proc., vol. 1, p. 20, 1885. 
On rocky ground the valves are of moderate size, the ends 
often broken and the exterior corrugated; in sandy ground the 
valves are very thin, of even growth, the markings complete, 
they are beautiful in form and color and of largest size; in peat 
the valves are very much deformed and much rounded. 
On the distribution of Litorina littoralis, idem., vol. 1, p. 61, 
1888 and vol. 3, p. 50, 1893. 
It was first noticed by Mr. Hollick at the Narrows in 1888. 
Smith, S., & Prime, Temple, Report on the Mollusca of L. I, 
and its Dependencies, Ann. Lyc. Nat. Hist. N. Y., vol. 9, pp. 
377-417, 1870. | 
Herein Odostomia trifida, O. bisuturalis, Polinices triseriata, 
Paludestrina minuta, Latorina rudis, L. littoralis and Lacuna 
vincta are recorded as having their southern limit at S, I. This 
is certainly not the case with the first four species. 
From these records one is struck by the decrease in the fauna 
accompanying the expansion of the city. One of the important 
factors in the extermination of the less hardy species is the 
crowding of the beaches for miles beyond the city limits with 
cottages and bungalos and the accompanying gasoline boats. 
This evil is obviated by the purchase of the land for large 
private estates and clubs. 
VITREA (PARAVITREA) MULTIDENTATA AND LAMELLIDENS. 
BY GEO. H. CLAPP. 
Having recently received a specimen of V. lamellidens from 
Norway, Me., I have gone over my collection with the idea of 
trying to find if lamellidens as it occurs in the north is really the 
same as the typical form from the Great Smoky Mountains or, 
as Dr. Pilsbry suggests in Proc. Acad. Nat. Sci., 1903, p. 209, 
merely ‘‘accelerated individuals (of multidentata), sporadically 
occurring.”’ 
