1888.] ON MAMMALS FROM COZUMKL AND RUATAN. 129 



Professor Howes, however, has suggested to me that the great iliac 

 prominences may have supported the metapterygium of the pectoral 

 fin in the same manner as the aiitorbital (post-palatine) cartilage is 

 related to the propterygium. The reflected tapering extremities are 

 certainly best explained upon this hypothesis ; and although the 

 crushing to which the fossils have been subjected prevents the 

 possibility of decisive proof, I venture to adopt this interpretation of 

 the structures as at present the most plausible. 



3. List of Mammals obtained by Mr. G. F. Gaumer on 

 Cozumel and Ruatan Islands, Gulf of Honduras. By 

 Oldfield Thomas. 



[Received January 26, 1888.] 



Mr. Salvia has asked me to put on record the names of the 

 Mammals collected by Mr. G. F. Gaumer, (1) on Cozumel Island, 

 situated off the east coast of Yucatan in 20° 30' N. lat. ; and (2) on 

 the Bay Islands — i .e., Ruatan with its companion Bonacca, off the 

 north coast of Honduras, 16' 25' N. lat., and 86° 2.5' W. long. 

 The specimens have been presented to the Natural History Museum 

 by Messrs. O. Salvin and F. D. Godman, for whom they were 

 collected. 



I. Cozumel Island. 



1. Nasua nasica, L. 



2. Nyctinomus gracilis, Wagn. 



.3. Chilonyctfris rubiginosa, Wagn. 



4. Artibeus perspicillatus, L. 



5. DiDELPHYS MARSUPIALTS, L'. 



II. Ruatan and Bonacca Islands. 



1. Saccoptervx bilineata, Temm. Ruatan. 



2. MoLossus OBSCURUS, Geoffr. Ruatan. 



3. Glossophaga soricina, PaU. Ruatan. 



4. Artibeus perspicillatus, L. Ruatati. 

 .5. SiGMODON HispiDus, S. & O. Bonacca. 



6. Dasyprocta punctata, Gray. Ruatan. 



A squirrel from the Island of Meco, on the north coast of 

 Yucatan, was also ol)tained, and proves to be referable to Sciurus 

 hypopyrrhus collitei. Rich. 



' As will be shown elsewhere, I consider this name applicable to all the large, 

 long-haired Opossums hitherto known as D. rirfftniana, D. cawrivora, 

 I), aurita, &c. 



Proc. Zool. Soc— 18S8, No. IX. 9 



