CHARACTERISTIC DEEP-SEA TYPES. SEA-URCIUNH. 



95 



to be its normal form and attitude. It is quite dangerous to 

 handle these specimens when alive, the wounds they inflict with 



Fig^. 359. — Asthenosoma liystrix. ^. 



their numerous minute sharp stinging spines producing a decid- 

 edly unpleasant sensation, accompanied by a slight numbness. 

 The sting is fully as painful as that of Physalia. These modern 

 Echinothurise were 



subsequently found 

 very abundant at 

 moderate depths. 

 The "Challenger" 

 dredged a srisfantic 

 species from this 

 group, 



measuring 





71^ 



no less than oJ2 -=^^ ss <^ ^/^ -^ , -^ 

 mm. in diameter. ''•^^,■0 ^"^ t 



The spines of the ~M!^f\ I''. 

 lower surface are 

 shod with a pecu- 

 liar hoof-shaped 

 tip ; on the test are 

 sheathed spines un- 

 like those of any 



Fig. 360. — Phormosoma placenta. |. 



