University of North Dakota. 27 



37 — Leptasterias compta. S. I. 



Off Newi)ort, R. 1.; 27 fathoms. 



38 — Ctenodiscus crispatus. Velvet Star. S. I. 



Massachusetts Bay. 



39 — Archaster Americaims. S. I. 



Oif Martha's Vineyard, Mass.; 89 to 202 fathoms. 



ORDKll ECHINOIDEA. 



40 41 — Echinus elegans. Sea-urchin. 



German Ocean. 



42 — rieterocentrotas trigonarius. With thick spines from 

 one to four inches in length. 



Mauritius. 



43 44 — Sphnerechinus granulans. 



Mediterranean Sea. 



45 — Strongylocentrotus drobachiensis. Common Sea-urchin 

 or Sea-egg. S. I. 



Off Newport, Rhode Island. 



46 — Arbacia punctulata. Purple Sea-urchin. S. I. 



Vineyard Sound, Mass. 



47 48 — Echinarachnius parma. Sand Dollar. S. I. 



Oft" Martha's Vineyard, Mass.; 26 fathoms. 



ORDER HOLOTHLROIDEA. 



49 — riolothuria atra. Black Sea-cucumber or Trepang. 

 In alcohol. 



Samoa. 



50 — Thyone Briareus. Sea-cucumber. S. I. 



Wood's Holl, Mass., sliore. 



51 — Leptosynapta Girardii. S. I. 



Wood's Holl, :\rass., shore. 



