30 ANNUAL REPORT OF THE 



REPORT ON INVERTEBRATE PALAEONTOLOGY. 



By P. E. Raymond. 



The Curator spent six weeks of the summer of 1919 in collecting 

 from the Chazy and adjacent formations on the borders of Lake 

 Champlain in Vermont and New York; as a result forty-two 

 drawers of specimens chiefly trilobites, gastropods, and brachio- 

 pods were added to the collection. All have been cleaned, identi- 

 fied, and labeled. Many of the species were described by the 

 Curator in earlier reports on the same region, and are to be found 

 in but few museums. A few undescribed species were obtained. 

 Unique specimens, the largest known Palaeozoic sponge, the 

 largest known hypostoma of a trilobite, and corals from the oldest 

 known coral reef, were discovered on Isle La Motte, Vt. 



In the spring and summer of 1920 a number of short trips were 

 made to the fossil-bearing localities in the vicinity of Boston, and 

 a number of specimens collected. What appears to be a new 

 locality for Silurian or Devonian fossils was found in the south- 

 western part of Topsfield by Dr. A. F. Foerste and myself. Dr. 

 Foerste obtained fossils from this neighborhood many years ago, 

 but after a careful search we were not able to rediscover the old 

 collecting place, although the new one is probably in its immediate 

 vicinity. 



In addition to the material collected in 1919, a number of smaller 

 collections, mostly in the stratigraphic collection, have been 

 identified, and the Asterozoa have been reidentifled and labeled. 

 A study was made of the Archaeocyathinae, about whose structure 

 new facts were discovered, and papers written descriptive of some 

 novel forms of Beatricidae, a starfish, and a crinoid, as well as the 

 results of an investigation into the nature of Phytopsis tubulosa 

 Hall. A report on the Shaler Memorial investigations of 1917 and 

 1918 was also prepared. 



During the year large collections of Silurian Cephalopods and 

 of Cretaceous Bryozoa were loaned to Drs. A. F. Foerste and R. S. 



