THE 



VOYAGE OF H.M.S. CHALLENGER 



ZOOLOGY. 



REPORT on the Ophiuroidea dredged by H.M.S. Challenger during the years 



1873-76. By Theodore Lyman. 



INTRODUCTION. 



This monograph attempts to describe and classify the OpfflURiDyE, or Brittle-Stars, and 

 the AsTROPHYTiDiE, or Branching-Stars, collected during the cruise of the Challenger. 

 Seeing that the twenty new genera and the one hundred and sixty-seven new species 

 formed a large proportion of those known, and considering that there were also 

 collected not a few of the old species, I deemed it wise to add the names of all others 

 previously described, and to arrange them under their genera with proper references and 

 explanations. Thus, by the addition of a few pages, the work has become a handbook of 

 the two families treated of. 



First comes the descriptive portion, wherein are given descriptions of the new 

 Ophiurkke arranged in their three groups, and of the Astrophytidge, both branching and 

 simple-armed. There are added, from time to time, such anatomical observations as I 

 have been able to make. Then follow tables of distribution, geographical, bathymetrical, 

 and thermal, with brief reflections on their indications. At the end is a note on fossil 

 species and their relations to those living. 



The anatomical parts spoken of are explained by frequent references to the plates. 

 Should the reader need more detailed information, he will find it in my Ophiuridse and 

 Astrophyticke Old and New, 1 or in Dr Ludwig's Morphologische Studien an Echinoder- 

 men. 2 In order to understand a description, it is necessary to bear in mind that the 

 animal is supposed to have the mouth below ; then vertically, towards the roof of the 



1 Bulletin of the Museum of Comparative Zoology, voL iii., part 10, pp. 254 and 2G0. 



• Zeitschr. f. Wissenschaftl. Zoologie, vol. xxii, 1878, p. 241 ; vol. xxxiv., 188(1, pp. 1 ami 57. 



(ZOOL. CHALL. EXP. PART XIV. 1882.) 1 



PL 



