64 MeW YORK STATE I^.tUStitJM 



in these respects than in H . r h e n a n u s and very much more 

 elevated. 



In the structure of the arms there is essential agreement with that 

 described for H. rhenanus. On the ventral aspect there are 

 two rows of plates '' in corresponding condition to each other, which 

 never touch along the arm axis." Apparently in H . g y a 1 u m 

 there is a slight tendency to alternation of opposite ventral plates as 

 shown on the mold of these structures in the Ithaca specimen. The 

 separation of these series of ventral plates is exhibited on the mold 

 as a solid uninterrupted ridge representing a longitudinal slit. The 

 lateral plates are well defined and bear several spines each, in con- 

 tradistinction to the German species which is described as having 

 but a single spine on each lateral. 



A comparison of Stiirtz's most complete individual of H . 

 rhenanus and the specimen of Helianthaster from the Bunden- 

 bach slates obtained by me as that species, leads to the impression 

 that they are not the same. The differences will be seen on exam- 

 ination of the figures here given of each. Stiirtz's H. rhenanus 

 has the free arms relatively very long, the disk correspondingly 

 small, the reentrant angles of the disk heavily plated. The last 

 named structures seem entirely absent on my specimen though the 

 specimen presents a very clear oral surface; moreover the arms 

 number 28 in contrast to the usual 14-16 of H . rhenanus, and 

 both lateral and dorsal plates are enormously spinous. I think the 

 differences are sufficiently distinctive to justify the designation of 

 this species asH. roemeri. 



FIELD MEETING OF AMERICAN GEOLOGISTS 



The Geological section (E) of the American Association for the 

 Advancement of Science held a summer field meeting at and near 

 Plattsburg, N. Y., July 3-1 1, inclusive, to which all members of the 

 Geological Society of America and the Association of American 

 Geographers were invited. The itinerary for these meetings was 

 planned and guided by members of the staff of this survey and as 

 the excursions and addresses were most instructive and given under 

 most favorable skies to a large company of geologists, an account 

 of the proceedings, taken from the report of the secretary, Dr F. P. 

 Gulliver [Science, Sept. 27, 1907] is inserted here. 



The preliminary trip on July 3 was made to visit " The Gulf " at 

 Covey hill. This drive of some 30 miles from Mooers, N. Y., across 

 the Canadian boundary was exceedingly interesting to all students 



I 



