RECORDS OF MEETINGS 347 



H. von W. Schulte, Oisr the Anatomy of a fcetal Balcenoptera 



horealis. 

 John D. Kernan, Jr., Eemaeks on the Eae or Balcenoptera 



horealis. 



SUMMAEY OF PaPEES 



Professor Osborn described and illustrated the remarkably complete 

 skeleton of a bird-like dinosaur allied to Ornitliomimus, recently mounted 

 in the American Museum. He showed its general resemblance to 

 struthious birds in the form of the skull and hind limbs and discussed 

 the various hypotheses which had been advanced concerning the life 

 habits of this animal. He then contrasted it with Tyrannosaurus, a giant 

 carnivorous dinosaur, and showed the wide adaptive divergence between 

 these two branches of the carnivorous dinosaur stock. The paper was dis- 

 cussed by Dr. Gregory. 



Professor Schulte stated that the following results are based upon the 

 dissection of a foetus measuring 37.5 cm. in length, collected by Mr. Eoy 

 C. Andrews at Eikusen, Japan. The complete details of the examination 

 Avill appear in the Monograph of the Pacific Cetacea, to be published by 

 the American Museum of J^atural History. 



The panniculus carnosus formed a very complete investment of the 

 venter and sides throughout tlie region corresponding to the body cavities 

 and neck. Over the dorsal muscles and pedicle it was replaced by 

 aponeurosis. From this arrangement it was thought that it might serve 

 by its contraction to maintain pressure upon the contents of the thorax 

 and abdomen as the animal rose to the surface. It may further subserve 

 an expirator function. In its disposition it closely resembles the cuta- 

 neous muscle of Phocaena except that in front of the shoulder its dorsal 

 division overlies the ventral instead of forming with it a continuous 

 sheet, which may, however, show a tendinous inscription. 



Throat furrows were not 3''et present. The integuments of the inter- 

 mandibular region, throat and thorax, well down upon the abdomen, 

 were, however, redundant and rendered easily movable upon the deeper 

 parts by the interposition of a layer of very loose areolar tissue. Between 

 this and the skin was a complex muscle intimately bound to the integu- 

 ments. Prom without inward was a thin layer of scattered fasciles of the 

 dorsal panniculus, then the ventral panniculus, then mylohyoid, and 

 finally a longitudinal stratum of hypoglossal cervical innervation, extend- 

 ing from mandibles to abdomen. The throat furrows, to which this 

 redundency of the integumentary complex is plainly antecedent, have 



