CLASS GASTROPODA 
297 
Type in United States National Museum, No. 218770. Type locality, 
San Pedro, California. 
Range. Known only from type locality. 
Callistochiton aepynotus Dali, 1919 
Proceedings of the United States National Museum, 55:511. 
Chiton yellowish-white, with a keeled back, the girdle as usual in the 
group; anterior valve with 10 annulate ribs and a slit for each rib; pos¬ 
terior valve small, low, with only about 5 feeble ribs, and 5 slits, the 
central area reticulate; intermediate valves with a narrow smooth line at 
the jugum, and single slits; the pleural tracts sharply obliquely reticulate 
with deep interspaces; the lateral areas bounded by 2 strong annulate ribs, 
the posterior rib wider, the interspaces regularly punctate-reticulate; in¬ 
terior white, the jugal sinus almost obsolete. Length 15; width, 7; height, 
5 mm. (Dali.) 
Type in United States National Museum, No. 225448. Type locality, 
Puget Sound, in 37 fathoms. 
Range. Known only from the type locality. 
Callistochiton fisheri Dali, 1919 
Proceedings of the United States National Museum, 55:512. 
Chiton light greenish-gray, small, strongly sculptured, the girdle cov¬ 
ered with minute closely crowded gray scales giving a velvety aspect; 
anterior valve with 12 strong annulate radial ribs with narrower inter¬ 
spaces, internally with 11 slits; posterior valve with the mucro behind the 
center, the central area coarsely irregularly reticulate, the posterior area 
elevated, with six strong annulate ribs, a slit to each rib, a roundly exca¬ 
vated jugal sinus and narrow rectangular sutural laminae; the interior is 
dark green; intermediate valves with one feeble slit at each end, excavate 
rather than mucronate at the jugal area which is obliquely recticulate, 
passing into the pleural tracts which are small, axially threaded, the inter¬ 
stices with minute transverse threads; lateral areas with two annulate ribs, 
the posterior stronger, denticulating the posterior edge of the valve; in¬ 
ternally pale greenish with a wide shallow straight-edged jugal sinus and 
narrow sutural laminae. Length, 10; width, 5; height, 3 mm. (Dali.) 
Type in United States National Museum, No. 110353. Type locality, 
Glory of Russia Bay, Tanaga Island, Aleutians. 
Range. Known only from the type locality. 
[899] 
