154 
PACIFIC SCIENCE, VoL XIII, April, 1959 
that genus is to be accepted, for it lacks the 
anal tubercles and the articulation of the outer 
uropod; in addition the specimens lack the 
ocular beak and in two of the three specimens 
the cardiac notch is lacking. 
Within the genus, T. mkroscaphis is best 
distinguished from T. idmheles by the form 
of the large chela, for in this species the dac- 
tylus is formed like a two-headed hammer, 
and the superior surface of the chela bears a 
marked depression to accommodate the su- 
perior projection of the dactylus when that 
article is flexed. In T. idiocheles, the dactylus 
of the large chela lacks this superior projection 
and there is no corresponding depression of 
the palm. From T. rathhunae this species is 
distinguished by the presence of a small 
rostrum as well as by the form of the large 
chela and the relatively greater length of the 
small chela. 
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