64 T. GtsLfeN. 



gets a C'liaractei'istic wart-shapod appoai-anoe. wliilo in Co7)iaiilIteri'i i( 

 continues to lengthen to a long, large chimney. In snialler young- 

 forms the uKHilh is central, hut excejtt in Vomasier serrata it is soon 

 dislocated marginally. 



The young of Vauia has. if my di'tfi-miniition is coi-rect. a vathei- 

 long unswollen anal cone, and a tolerably »lean» disk. 



Naturally the fixed points obtainable by an exaniination of the 

 disk, are only to be used together with the othci" characteristics w hicii 

 ai'e found. If. ho\\e\"er. in the comparis(»n and systematizing of ihe 

 Con)asteri(l youngs one takes in(o consideration the appearance and 

 foi-mation of the disk, I believe that we will be able to predict with 

 greater probability than otherwise to which species or genus the young 

 Comasterid in (piestion might be referred. 



Zygometridae A. 11. (laek. 



Catoptometra A. II ('i.akk. 

 C. Hartlaubi A II. Ci.akk. 

 Fig. 48-51. 

 Svn: Avfrdoi, Unrthnihi IHOT A. II. Ci.akk I'n.c. L". S. .\al. .\Ius. Vol. ;{:J, 

 p. 72: 



Zygomeirn Kochlrri 1907 A. H. Cl.ujk Siniilis. Misc. Coll. Vol. 50, p. .'{Si*; 

 Catopfomrir'i Harthtiihi 15)08 A. H. Clakk Proc. U. S. Nat. Miis. Vol. 34, p. 

 317; 1912 Clin Iiid. Ocean, p. lOti; 1915 Monomapli pj).; .loiirii. Acad. Sci. \'o\. 5, 

 p. 214; 1918 Siboga Exp. Vol. 42 H. p. <i3. 



From St. .") = 1 specimen. 



Sp. 1 Cd. large, flattened, a little deepened in the centre, with 

 calcareous granules which towards the margin are arranged in about 

 10 rays. Diameter ."> mm. free dorsal pole 3... mm. h = 0.8 mm. 



('. XXVIIl 14—15 (D) 1(5—17 (V|. 11—17 mm. in two close, alter- 

 nating whorls. 2'^ segment cubical. IV a little longer, slightly hour-glass- 

 shaped (= most of the following cirrals). 5"' — 7"' segment L = 2 br. 

 then shorter again L= 1 '/- — I '^ lj'\ \\ithout dorsal spines. I'enul- 

 timate segment L = 1 '/' b'" ^^"'th ilorsal medially placed, very weak 

 opposing spine, h about V'' t»f the br of the segment. Terminal claw 

 narrow, somewhat curved, longer than the preceding segment. 



