THE - CONCHOLOGISTS’ - EXCHANGE. 23 
“subtus convexus, turgidus. Apertura sub- 
“obliqua ampla; peristoma late expansum vel 
“reflexum, ad columeilam late dilatatum, um- 
‘‘bilicum tamen plerumque non obtectans.” 
Types: H. Hunteri, Cox; H. Allasteri, 
Cox, etc. 
Geog. distrib.: Solomon’s Islands (Guadal- 
canar, Malanta Islands). 
XXVI.—Sphincterochila, Anc. 
“Testa superne speciebus pluribus generis 
“ Teucochroce similis, a quo valde differt singu- 
“lari apertura constricta, sinuata incranataque, 
“‘intus interdum hepatica et animali characteri- 
“bus, teste G. W. Binney, animali Helicis 
‘similis. Prope Macularias verisimiliter collo- 
“* canda.” 
Diy pesic abit 
Charp. 
filia, Mouss.; H. Boissieri, 
Geog. distribution: As far as known, re- 
stricted to the vicinity of the Dead Sea, and to 
N. Arabia. 
To be Continued, 
Young ®ollectors’ Corner 
The Succinea Obliqua, Say, of Fair- 
mount Park, Philadelphia, with some 
remarks regarding the relationship 
of Succinea Totteniana, Lea. 
BY JOHN FORD. 
For a number of years J failed to discover in 
the Park asingle specimen of the genus Szcctxea, 
though many examinations were made by me in 
localities favorable to their growth. Mentioning 
this fact to G. Howard Parker, then an active 
worker in the Philadelphia Academy of Natu- 
ral Sciences, he informed me that a few might 
be obtained along a rocky ledge on the north 
side of the Wissahickon, a short distance east 
of Ridge Avenue. Some days afterward we 
visited the locality together, and secured about 
a dozen specimens all in fair condition. One 
year later, in company with Dr. J. Bernard 
Brinton, I visited the place again and captured 
several more. ‘This was in the morning of a 
hot June day in 1886, which we mostly spent 
along the upper reaches of the stream. On re- 
turning, towards evening, we wandered into 
the dry bed of a former pond located between 
the carriage way and the stream, and within 
a ‘‘stone’s throw” of the lower dam. This 
depression was, perhaps, fifty feet square; with 
several large willows standing upon the outer 
bank, and a strong growth of weeds covering 
the bottom. 
While looking for other species supposed to 
be there, our attention was attracted to numbers 
of Succinea feeding upon the plants, and also 
upon the willow branches which extended some 
twenty feet over the basin. Though somewhat 
surprised to find them in such singular quarters 
we went quickly to work and secured a large 
number before night-fall. Many others were 
obtained a few days afterward by the Doctor’s 
son, Theodore, and a short time later fully a 
hundred more fell to my share; making in all, 
over 200 specimens, a wonderful number to be 
found in so small an area. 
All of the shells were transparent, and so 
delicate in texture that I at first entertained 
some doubts in regard to the species; this feel- 
ing of uncertainty being strengthened by the 
fact that Professor Gabb does not mention S. 
obligua at all in his “Catalogue of the Mollusca 
in the neighborhood of Philadelphia,” pub- 
lished in Vol. 13, Proceedings Philadelphia 
Academy of Natural Sciences. A subsequent 
examination, however, satished Mr. Tryon as 
well as myself that they were really Szccenea 
obligua, Say. But, in opposition to Mr. Tryon’s 
views, I was and still am of the opinion that 
they embrace every character claimed for Szc- 
cinea Totteniana, Lea, save the occasional 
greenish tint, and that no further evidence than 
the shells themselves is needed to prove Szc- 
cinea obliqua, Say, and Succinea Totteniana, 
Lea, to be one and the same species; allied so 
closely indeed, that, the latter cannot in a gene- 
ral sense, be justly separated from the former, 
even as a variety. 
