Vol.  49.]  PROCEEDINGS  OE  THE  GEOLOGICAL  SOCIETY.  151 
The  List  of  Donations  to  the  Library  was  read. 
The  following  communications  were  read  : — 
1.  “On  Composite  Dykes  in  Arran.”  By  Prof.  J.  W.  Judd, 
E.B.S.,  Y.P.G.S. 
2.  “  Notes  on  an  Intrusive  Sheet  of  Diabase  and  Associated 
Bocks  at  Bobin  Hood,  near  Bassenthwaite.”  By  J.  Postlethwaite, 
Esq.,  F.G.S. 
3.  “  On  Two  Dinosaurian  Teeth  from  Aylesbury.”  By  B. 
Lydekker,  Esq.,  B.A.,  E.G.S. 
4.  “  On  a  new  Plesiosaur  from  the  Waipara  Biver,  New  Zealand.” 
By  Capt.  E.  W.  Hutton,  E.B.S.,  E.G.S. 
[Abstract.] 
This  specimen  was  shortly  described  by  Sir  James  Hector  in  1873. 
The  Author  considers  it  more  prudent  to  follow  Mr.  Lydekker  in 
referring  all  the  known  New  Zealand  Cretaceous  Sauropterygians 
with  which  he  is  acquainted  to  Leidys  genus  Cirnoliostiurus ,  and 
he  therefore  describes  this  form  as  a  new  species  of  that  genus. 
Discussion. 
The  Chairman  remarked  that  the  fossil  described  by  Capt.  Hutton, 
and  referred  by  him  to  Cimoliosaurus  cauclalis,  exhibits  the  remains 
of  a  Plesiosaur  from  New  Zealand  showing  the  pelvic  and  pectoral 
girdle  and  the  vertebral  column  and  ribs,  but  otherwise  imperfect. 
Capt.  Hutton  had  no  doubt  in  his  paper  justified  the  proposal  to 
constitute  a  new  species  for  this  Plesiosaur.  One  must  regret  that 
distance  prevented  the  Author  from  being  present  to  read  his  own 
communication. 
5.  “  Observations  on  the  Affinities  of  the  Genus  Astrocoenia”  By 
Bobert  E.  Tomes,  Esq.,  E.G.S. 
6.  “  Description  of  a  new  Genus  of  Madreporaria  from  the 
Sutton  Stone  of  South  Wales.”  By  Bobert  E.  Tomes,  Esq.,  E.G.S. 
7.  “  Study  of  the  Dykes  of  Hope,  Idaho.”  By  Herbert  B.  Wood, 
Esq.  (Communicated  by  the  President.) 
[Abstract.] 
In  this  paper  a  description  of  the  geographical  distribution  and 
characters  of  acid  and  basic  dykes  traversing  slates  and  quartzites 
along  the  northern  shore  of  Lake  Pend’Qreille,  Idaho,  is  accompanied 
