522 *' THETIS " SCIENTIFIC RESULTS. 



fAstroporpa austraUensis. 

 fAsTROTHROMBUS (gen. nov.) rugosus. 



Conocladus arnhlyconus. 



C hcetodiadema tubercidatum. 



Fibularia nutriens. 



Molpadia dissimilis. 



Molpadia productamensis. 



The study of this collection has been most interesting, and 

 I desire to express here my tlianks to the Trustees of the 

 Australian Museum for the honour they have done me in 

 entrusting it to my care. I wish, further, to express my great 

 obligation to Mr. Etheridge for his constant courtesy, which has 

 made possible the publication of tlie report in so short a time and 

 so satisfactory a manner, in spite of the great distance that has 

 separated us. I take pleasure also in acknowledging the patience 

 and skill with which Miss Dandridge has succeeded in making 

 accurate drawings of the Ophiurans, many of which were either 

 so small or so badly broken, that good iigures seemed almost 

 impossible. 



CRINOIDEA. 



Although there are only three species of Crinoid represented 

 in the collection, two of these appear to have been hitherto 

 undescribed, and both are of rather more than usual interest. Mr. 

 Austin Hobart Clark kindly examined much of the material and 

 assisted in its identification, and I wish to express here my thanks 

 to him for this aid and for many helpful suggestions. I have 

 also followed the guidance of his published papers in writing my 

 descriptions, in order that mine should be uniform with his. I 

 have adopted his recently proposed genera without hesitation, 

 not merely because his unusually extensive knowledge of the 

 class justifies such a course, but because his classification appeals 

 to me, on the whole, as being very natural. I regret to add that 

 we do not agree on the status of Himerometra poidophora. 



OLIGOMETRA THETIDIS,* sp. nov. 



(Plate xlvii., figs. 1, 2, 3.) 



Centro-dorsal small, low hemispherical, nearly concealed by two 

 marginal rows of cirri ; these (PI. xlvii., fig. 3) are about sixteen in 

 number, 7-8 mm. long, with fifteen-eightcen joints besides the claw; 

 basal joints wider than long, but distally they are squarish; each 



* Thetidis — ot the " Thetis." 



