76 BULLETIN 73, UNITED STATES NATIONAL MUSEUM. 



Genus HYPEROOOON Lacepede. 

 HYPEROODON AMPULLATUS (Forster). 



Balsena ampullatus Forster, Kalm's Linnean Travels, vol. 1, 1770. p. 18, footnote. 

 Balsena roslrala Muller, Zool. Dan. Prodrom., 1776, p. 7. 



Ilyperoodon hutsl-opf Lacepede, Hist. Nat. des C6taces, 1803-4, pp. xliv and 319. 

 Hyperoiidon roslratum. Wesmael, Nouv. Mem. Acad. Roy. Bruxelle.'?, vol. 12, 1840, pis. 1, 2. 

 Ilyperoodon ampullatus. Rhoads, Science, new ser., vol. 15, 1902, p. 756. 



The National Museum has one skeleton of this well-known species, somewhat 

 imperfect, which is labeled as having been obtained on the coast of Norwa^y, and was 

 received about the ,year 1875. Its catalogue number is 14499. This skeleton is 

 about 19 feet long and has the following vertebral formula: C. 7; Th. 9; L. 9; Ca. 

 19 (+1 ?) = 44 (or 45). Eight chevrons are attached to the caudal vertebrae, and 

 at least two more were present originally. The fifth thoracic vertebra has no facet 

 on the centrum for the head of the sixth rib, but the latter articulates with a small 

 facet on the side of the centrum of the sixth thoracic vertebra. The seventh 

 thoracic has a well-developed transverse process on the side of the centrum. The 

 ninth rib is shorter and more slender than the others. None of the transverse 

 processes of the caudal vertebris are perforated by foramina. These processes end 

 on the eighth caudal, and the neural spines on the tenth caudal. The fi-ee ends of 

 the neural spines of the thoracic and lumbar vertebra? are all more or less rounded. 

 The pectoral limbs are incomplete. 



So far as I am aware, only three examples of Ilyperoodon have been taken on 

 the coasts of the United States, as mentioned in the list on page 2. The skeleton 

 of one of these (from North Dennis, Massachusetts) is in the Museum of Comparative 

 Zoology, Cambridge, Massachusetts, and the skull of the second (fi'om Newport, 

 Rhode Island), which was a female, is in the Academy of Natural Sciences of Phila- 

 delphia." This skull is represented in PI. 32, fig. 3 



LIST OF SPECIES OF EXISTING ZIPHIOID WHALES. 

 Genus MESOPLODON Gervais. 



MESOPLODON BIDENS (Sowerby i. 



North Atlantic Ocean- northern France to Norway and Sweden; Nantucket 

 Island, Massachusetts. 



MESOPLODON EUROP.ffiDS (Gervais). 



North Atlantic Ocean ; English Channel ; New Jersey. 



MESOPLODON GRAYI Haast. 



New Zealand and Chatham Islands; Bahia Nueva, Patagonia (Moreno). 



a Proc. Acad. Nat. Sci. Phila., Dec. 1869, pp. 191, 192. 



