166 BULLETIN OF THE 



merous ; but with the exception of the young stages of a few species, 

 and additional data regarding the geographical distribution of many 

 species, there were no novelties brought to light. I shall take another 

 occasion to publish a final report on the Echini. 



The " Albatross " dredged on her voyage from New York to San 

 Francisco, off Indefatigable Island, one of the Galapagos, at a depth of 

 392 fathoms, three imperfect specimens of a most interesting Stalked 

 Crinoid. At the first glance, it might readily pass for a living repre- 

 sentative of the fossil Apiocrinus ; but on closer examination we found 

 that it revealed some features which ally it with Millericrinus, and 

 others with Hyocrinus and Rhizocrinus. It soon became apparent that 

 we were dealing with a new type, combining structural features of all 

 the genera above named. It has, like Hyocrinus and Rhizocrinus ? only 

 five arms ; they are, however, not simple, but send off from the main 

 stem of the arm three branches to one side and two to the other. 



As in Hyocrinus, the first radials are high, the second radials much 

 narrower than the first. The system of interradial plates is highly 

 developed, as in Apiocrinus and Millericrinus, six rows of solid polygonal 

 imperforate plates being closely joined together, and uniting the arms 

 into a stiff calyx as far as the sixth or seventh radial, and to the third 

 or fourth joints of the first and second pinnules. These two pinnules 

 are on the fourth and fifth radials ; the third pinnule is on the sixth 

 radial ; and they are all below the first axillary, which is the eighth ra- 

 dial, and which gives rise to the first branch from the main stem. The 

 second and fifth, sixth, or seventh radials have syzygies. 



The imperforated interradials are followed by smaller, somewhat 

 thinner and perforated perisomatic plates, which extend to the promi- 

 nent lateral plates of the food groove. The interradial calycinal plates 

 extend along the arms for a considerable distance beyond the first 

 branch. 



The ventral surface extends nearly horizontally from the mouth to 

 the level of the seventh radial, and this plane may be considered the 

 greatest width of the cup, the interradial spaces arching very slightly 

 toward the mouth, at the junction of the imperforate interradial plates 

 with the perforated perisomatic plates. 



The solid imperforate interradial plates extend over the prominent 

 anal proboscis. The oral plates at the interradial angles of the food 

 groove are small, but easily distinguished from the adjacent lateral 

 and covering plates. They are separated from the so called calyx in- 

 terradials by three or four rows of perforated perisomatic plates, except 



