Volume XV. October, l8g8. Number I. 



JOURNAL 



MORPHOLOGY. 



A NEW PERIPATUS FROM MEXICO. 



WILLIAM MORTON WHEELER. 



Dr. Gustav Eisen, of San Francisco, has most generously 

 placed at my disposal all his material — some 'iy specimens 

 — of a new species of Peripatus, with permission to describe 

 the animal and the development of its embryos. The speci- 

 mens were taken by Dr. Eisen during November, 1894, at 

 Tepic, Mexico, at an altitude of 4000 feet. He found them 

 under stones and pieces of wood in a shady spot along a ditch 

 of water flowing from some baths on the outskirts of the town. 

 The animals were killed in a fully extended condition by 

 drowning them in water, to which a few drops of ammonia had 

 been added. They were then carefully hardened in corrosive 

 sublimate. 



The species which I take pleasure in naming Peripatus 

 cisenii, after its discoverer, is a true neo-tropical Peripatus. 

 With the exception of P. edwardsii Sedgwick, from Venezuela, 

 the descriptions of the American species are not very satis- 

 factory. I shall, therefore, make most use of a comparison 

 with this species in the following description of the exterior 

 of P. cisenii. Anatomical and embryological details are 

 reserved for future publication. 



