ve 
¥ 
Soe hale 3. Vata 
eS ee 
> Rig 
13 
21:0092 Poromya (Dermatomya) buttoni Dall. Monterey bay, Cal. 
Shell small, rounded-quadrate, plump, thin, yellowish olive, 
hardly polished, smooth, with irridescent reflections from under 
_ the periostracum when fresh; beaks nearly central, not prominent, 
hinge teeth normal, strong; interior bluish white, margins entire, 
pallial sinus shallow; length 9.8, breadth 8, diameter 6 mm, 
Fred L. Button, collector. 
21:0093 Poromya (Dermatomya) beringiana Dall. 
Bering Sea, to Tillamook, Oregon. 
21:0094 Poromya (Dermatomya) leonina Dall. Off Washington, 
877 fathoms, 
21:0095 Cetoconcha malespinae Dall. Alaska, 1579 fathoms, off 
Sitka. 
21:0096 Myonera tillamookensis Dall. Off Tillamook bay, Ore- 
gon, 786 fathoms. 
21:0097 Cuspidaria apoderma Dall. Alaska (to Panama bay, in 
deep water). 
21:0098 Cardiomya balboae Dall. Cortez Bank, Cal. 
Shell small, whitish with a yellow periostracum; inequila- 
teral, rostrate, somewhat inflated, posterior end shorter, anterior 
ovately rounded; beaks small, pointed, not elevated; sculpture 
of anterior half of the disk faintly irregularly concentrically rip- 
pled; behind this 12-15 radial, more or less alternated threads 
extending to the margin from the umbones and increasing in 
strength backward; behind the last and strongest an excavated 
concentrically striated space marks the beginning of the rostrum 
which beyond that has 4 or 5 faint radial threads and is abruptly 
truncate; length 8.9, height 5, diameter 3.2 mm. 
21:0099 Calyptogena elongata Dall. Off Pt. Loma, Cal. 
Shell resembling a Tagelus in form, elongate compressed, 
white under a yellowish periostracum, rounded at both ends, base 
nearly straight; anterior dorsal slope short, beaks low, small, 
pointed, about 10 mm from anterior end of valves, posterior 
slope long, gently arcuate; surface devoid of any sculpture ex- 
cept rather conspicuous incremental lines; ligament strong; in- 
terior porcellanous white, pallial line entire; hinge teeth small, 
normal; length 44, height 17.5, diameter 10 mm. This can be 
distinguished at once from C. pacifica by its elongate form and 
more delicate and compressed shell. Santa Barbara Islands to 
San Diego, Cal. 
21:0100 Venericardia (Miodontiscus) meridionalis Dall. Off Pt. 
Loma, Cal. 
Shell small, solid, white, with 9 to 10 strong rounded ad- 
jacent radial ribs cut by about as many concentric incised lines, 
the segments of ribs more or less swollen; beaks small, erect, no 
visible lunule, or escutcheon; teeth strong; inner margin coarsely 
crenulate; length 4, height 4, diameter 2 mm. Smaller, less com- 
pressed, and more conspicuously sculptured than the northern 
M. prolongatus. In 70 fathoms. 
21:0101 Milneria kelseyi Dall. 
Shell wider, more depressed, less angular, larger than M. 
minima; a conspicuous ridge extends from umbo to posterior 
