72 
Other PetroliS^hfqes (some) are tawny olive to olive, chelae and forepart 
of carapace darker some have sage green color to olive on chelae and forepart 
of carapace dark maroon purple marked with nile blue, underside glaucous green 
grooves =s. tube feet cream buff. 
Petrolisthes all among shingle of beach amphipods except Caprella ditto. 
#23. Back again on San Lorenzo. Nov. 3, 1926 
Water temp. l8.°9 C, density 1026.5, temp. 20° C. even. 
Collected to right of Naval Base looking toward Callao. Prize of day - 
two small Porcellanids on membrane around mouth of sea urchin. Only the two 
0 
ft Iy 
tiny ones on a dozen urchins. Jfwo of the same appearance of species. I got 
Porcellanids off and the second of these was up high and dry on beach. 
Little Cancer (Cycloxanthops sexdecimdentatus) dull white and around fore 
edge of carapace.anterior median part drab grey with 
touches of russet. Fingers of chelae like left, black 
end of mummy brown. Hinder part more lilac grey. 
Propodi and dactyli of first and second legs drab to raw umber, distal 3 r ^ 
c 
of dajtyls white, dactyls of 3^ legs with band of above color (drab to raw 
umber), hind, 4th legs all white. 
#24. Sunday, Nov. 7? 1926 
Dredge opposite passage between San Lorenzo and adjacent Island off 3 arch 
rocks. Dept between 20 & 30 feet. 
Cycloxanthops purpureous. Carapace generally a dark prune purple to claret 
brown so dark that on higher parts of carapace it is almost black, ditto on antero 
lateral spines. Legs almost orange ochraceous X orange buff color. 
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