20 THE NAUTILUS. 



* Triehotropis borealis Br. & Sby. Station 2, Alert Bay. New 

 to this Province. 



Turbonilla ckocolata Cpr. Both at Stations 2 and 4. 

 *Turbonilla stylina Cpr. Cumshewa Inlet, Q. C. I., at Station 3. 

 A Californian shell, new to B. C. 



* Turbonilla torquata Glcl. 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 boreal!* 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. 2'1. 



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, crvciatum and punctahnn. Also found 

 in the stomach of the "Buffalo Sucker" (fish) with Pis. cruciutinn 

 and other molluscan shells. It is decidedly and constantly distinct, 

 not a variety or depauperate form of !'!#. <-i>ni/>i-esmiii. The latter 

 has been collected in this vicinity in many places and in very differ- 

 ent forms. Old specimens of J'is. 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. 



