1886,] NATURAL SCIENCES OP PHILADELPHIA. 385 



tions of both zoological and geological material. Special atten- 

 tion was directed to the study of the fossiliferous deposits of 

 the Island of Nantucket, with the result of demonstrating the 

 erroneousness of the hitherto described sections of those deposits. 

 The data obtained during this trip will be published in the 

 Proceedings of the Academy. 



The collections of the Academy in the department of Inverte- 

 brate Paleontology have been, as far as arrangement and classifi- 

 cation are concerned, materially improved during the year ; the 

 entire series of fossils pertaining to American geology is now 

 readily accessible, and in a condition for easy reference. More 

 than three-fourths of this collection are permanently labeled. 

 Roughly estimated, the collections in this department, embracing 

 both foreign and American fossils, occupy upwards of 20,000 

 trays, and are probably second to no other collection in import- 

 ance in this country. Special importance attaches to the series 

 of Cretaceous and Tertiary fossils, especiall}' the latter, in which 

 are included probably four-fifths of all the types that have been 

 described from this country. The Paleozoic fauna is, on the 

 other hand, very inadequately represented, although the collec- 

 tions of the Pennsylvania Geological Survey, now deposited with 

 the institution, will add very materiall}'' to this section when 

 displayed. 



Further reference to the collections in the department of 

 Invertebrate Paleontology is contained in the report of the 

 Curators of the Academy. 



Very respectfully, 



Angelo Heilprin, 

 Trof. of Invertebrate Faleontology. 



REPORT OF THE PROFESSOR OF INYERTEBRATE 



ZOOLOGY. 



The Professor of Invertebrate Zoology respectfully reports 

 that during the past year he has delivered a course of ten lectures 

 on the " Special Senses." 



He further reports that the collections under his charge have 

 somewhat increased. 

 36 



