98 THE NAUTILUS. 



Mr. P. B. Randolph at Seattle, and Mr. Henry Heninhi 11 in several 

 localities, have brought to light a goodly array of Sphaeria and 

 Pisidia, and regarding these the following notes may he of interest. 



Sphcerium primeanum Clessin. This shell, described in the Mon- 

 ograph of the Cyclades, is so little known to collectors that a brief 

 description will he useful. Shell large, equilateral, dark brown or 

 black with lighter beaks, shining. Outline rhomboidal, a little 

 more elongated and the ends more rounded than Kph. rlwmboideum 

 Say, but the dorsal aspect very much like that of the species. The 

 full, rounded beaks make the vertical section broadly cordate. One 

 specimen, chestnut colored and with yellow border, is so close to 

 Sph. rhomboideum as to be held in doubt. That species has been 

 found in northern Idaho, and may naturally be expected from 

 Washington. S. primeautnn was found in Lake Washington, Seattle. 



S. dentatum Hald. Handsome, bright green shells, differing only 

 in color from brownish Oregon specimens, are doubtfully referred 

 to this species. Collected at Spokane Falls by Mrs. Mary P. Olney. 



iS'p/i. nubile Gould. Identified by Dr. J. G. Cooper. It is a large, 

 shining, dark brown shell, resembling fyilt. tlciitntum Hald., but less 

 inflated. The young shells are thin and smooth, while in S. den- 

 tiihuii they are more heavily striated than the adult. Abundant in 

 small streams, Seattle. 



Sph. occidental Prime. Found at Spokane Falls by Hemphill. 



.Vy///. riii/iiiiinili .1. < >. Cooper. Small specimens abundant in 

 streams at. Seattle. Larger ones in Lake Washington. Beautiful 

 specimens from Spokane Falls and Chehalis River (Hemphill). 

 Also found in Idaho ami Vancouver's Island. The species was 

 found orii;inallv by Mr. Wm. J. Raymond in Tuolumne Co., Cal., 

 at an altitude of 8700 feet, in 1889. 



1'ixiiliinn Idn/iiii 'nxe Roper. First found by Mr. Henry Hemphill 

 at Old Mission, Idaho, in 18!)0. Found abundantly in streams at 

 Seattle by Mr. Randolph, and much larger than the types. One 

 fine specimen has the following dimensions: Long. 0'4~> inch; lat. 

 0'39 inch ; diam. <)">() inch. This is certainly the largest known 

 specie.- nf I'isidiiui). 



/'. r,ii-inhilc Prime. Streams at Seattle. Unusually large. 



/'. i;,iii/,ri:xxitt Prime. Green Lake, Seattle. 



/'. nlxlihnii Hald. Common in water courses at Seattle. 



/'. iilti-iuii<iiil"iiinii Prime. Unusually robust specimens from Seat- 

 tle. As nearly everv Pisidiuiu found mi the Pacific Slope has been 



