THE 



VOYAGE OF H.M.S. CHALLENGER. 



ZOOLOGY. 



REPORT on the Asteroidea collected during the Voyage of H.M.S. 

 Challenger during the Years 1873-76. By W. Percy Sladen, 

 F.L.S., F.G.S., &c, Secretary of the Linnean Society. 



PREFACE. 



The preparation of the Eeport on the Asteroidea obtained by the Challenger Expedition 

 was entrusted to me by the late Sir C. Wyville Thomson, and I received the collection 

 in the early part of the year 1881. Dr. John Murray subsequently placed in my hands 

 the starfishes collected during the cruises of the "Lightning," "Porcupine," "Knight 

 Errant," and " Triton ; " and an account of these is included in the present Report, which 

 has thus become a statement of all the Asteroidea obtained by British deep-sea dredging 

 Expeditions up to the present date. 



In the following pages there are described 33 genera, 2 subgenera, 196 species, and 15 

 varieties first discovered by the Expeditions above named ; and 9 other new genera and 

 3 subgenera, based on forms previously known or not obtained by these Expeditions, are 

 established. 



Summarising each Expedition independently : in the Challenger collection there are 

 84 genera, 5 subgenera, 268 species, and 13 varieties; of which 34 genera, 4 subgenera, 

 184 species, and 12 varieties are new (five of the new genera and two subgenera being 

 based on types of which one or more representatives have been previously known). 



In the "Porcupine" collections of 1869 and 1870 there are 25 genera, 1 subgenus, 

 29 species, and 1 variety ; of which 7 genera, 1 subgenus, 10 species, and 1 variety are new 

 (two of the genera being based on types of which representatives were previously known). 



In the "Lightning" collection are 3 genera and 3 species; of which 1 genus and 1 

 species are new. (In the case of the "Lightning" and " Porcupine " Expeditions it is 



(ZOOL. CHALL. EXP. — PART LI. — 1888.) a 



