PYCNOGONIDA— CALMAN. 



23 



successively increasing in length, sixth about twice as long as thick ; the surface almost 

 devoid of setse. 



Oviger with fourth segment almost equal to sixth ; distal segments with four rows 

 of spines. 



Legs slender, femur more than ten times as long as thick. Femur and first and 

 second tibiae successively decreasing in length. Tarsus and propodus subequal, claw 

 little shorter than propodus. 



Surface of body and limbs smooth, without conspicuous setge or spiuules. 



Measurements, in mm. — ■ 



Length of proboscis . 



Greatest diameter of proboscis 



Length of trunk 



Width between second and third 



processes .... 

 Width across second lateral processes 

 Length of abdomen . 

 Third right leg — 



Coxse 



Femur .... 



First tibia 



Second tibia 



Tarsus .... 



Propodus 



Claw .... 



Palp- 



Second segment 



Third 



Fourth 



Fifth 



Sixth 



Seventh 



Eighth 



Ninth 



Remarks. — Among those of the longitarsal species that have the sixth segment 

 of the palp not more than twice as long as thick, this species appears to be at once 

 distinguishable by having the five distal segments of the palp successively increasing 

 in length. The species is named after Staff-Paymaster Francis R. H. Drake, R.N., 

 Secretary and Meteorologist on board the "Terra Nova," who gave much help in the 

 work of the biological staff. 



