20 THE NAUTILUS. 
* Trichotropis borealis Br. & Sby. Station 2, Alert Bay. New 
to this Province. 
Turbonilla chocolata Cpr. Both at Stations 2 and 4. 
*Turbonilla stylina Cpr. Cumshewa Inlet, Q. C. L., at Station 3. 
A Californian shell, new to B. C. 
* Turbonilla torquata Gld. With the last. 
* Turbonilla tridentata Cpr. At Station 3, Cumshewa Inlet. 
Though found in Puget Sound many years ago, it has not before 
been reported from British Columbia. 
* Venericardia borealis Conr. At stations 2 (Alert Bay) and 4, 
Skidegate Inlet. 
C. F. NEwcoMBE. 
DESCRIPTIONS OF NEW PISIDIA. 
BY DR. V. STERKI. 
Pis. fallax n. sp. 
Mussel] rather small; it is of the same type with Pis. compressum 
Pr. but smaller, more rounded in outline, the upper margin is less 
strongly curved, not angular, the ridges on the beaks are compara- 
tively larger and situated less high up; the striation is finer, 
crowded, somewhat irregular and sharp; the color commonly green- 
ish or yellowish-horn in the younger, more yellow in older speci- 
mens; the hinge is strong, more regularly curved than in compres- 
sum, the hinge plate broad, the cardinal tooth of the right valve 
more oblique, the lateral teeth strongly projecting inward ; nacre 
more glassy-whitish ; ligament strong. 
Size: long 3:2, alt. 2°9-3, diam. 271. 
Habitat: Tuscarawas River and Sugar Creek, Ohio. 
It was first noticed in October and November, 1891, when hun- 
dreds of specimens were collected, and so every year since, in com- 
pany with Pis. compressum, cruciatum and punctatum. Also found 
in the stomach of the “ Buffalo Sucker” (fish) with Pis. crucvatum 
and other molluscan shells. It is decidedly and constantly distinct, 
not a variety or depauperate form of Pis. compressum. The latter 
has been collected in this vicinity in many places and in very differ- 
ent forms. Old specimens of Pis, fallax are almost always badly 
eroded, and covered with a thick, blackish coat, while Pis. compres- 
sum from the same places, were intact and clean. 
