REPORT ON THE OPHITJROIDEA. 



319 



Ophiacantha cosmica, III., IV. 

 Ophiolehes scorteus, III., IV. 

 Ophiomitra plicata, III., IV. 



sarsii. 



chelt/s, III., IV. 



carduus. 



Number of Species in Table V., 69 



Epitome. 



Ophiambix aculeatus. 

 Ophiogeron edentulus. 

 Ophiohelus 2)ellucidus. 

 Ophiotholia supplicans. 

 Opliiocreas abyssicola. 



Of about 500 species in the two families, the preceding tables show us that more than 

 one-half (278) are found above the depth of 30 fathoms, and of these, that 226 species 

 go no deeper, but cling close to the land, from low- water mark to 180 feet. The remain- 

 ing fifty-two species descend not further than 150 fathoms, except fourteen, whose depth 

 is less than 500, again excepting two species that go lower than 500 but do not reach 

 1000 fathoms. Below this last point only one littoral Ophiuran has been found, 

 Ophiacantha bidentata. Of the 151 species found between 30 and 150 fathoms, sixty- 

 nine are not found either above or below; two descend from below 30 to below 1000 

 fathoms ; five to below 500 ; and thirty to below 150 fathoms. A nearly equal number 



