1893.] MB. O. THOMAS OJf JilAMMAXS rBOM CBNTRAIi PEBTT. 333 



Plate XXVII. 



Fig. 10. A transverse section through the rectum of 5. tessellatus, to show the 

 arrangement of the rectal tafts. Oa the left are scattered portions 

 of the tufts surrounding and opening into the main duct, which is 

 supported by two mesenteries. The section is cut obliquely, and on 

 the riglit it passes beyond the tufts but through the duct, and the 

 communication of the latter with the lacunar spaces in the wall of 

 rectum is shown. The outlines of the skin and of the longitudinal 

 muscles in section are shown above. 



11. A transverse section through the oesophagus of S. cuinanensis. Above 



the oesophagus is seen the dorsal blood-vessel with diverticula 

 opening into it, other diverticula crowded with blood-corpuscles are 

 shown in various planes. The retractor muscles are seen at the side. 



12. A branch of the rectal tufts of S. nudity, highly magnified. 



13. A section taken through the tentacular fold and brain of S. nudus. 



The ciliated coating of the fold and the numerous blood spaces in 

 its walls are shown. Below, the latter open into the dorsal blood- 

 vessel which bathes the ventral surface of the brain. The ciliated 

 pit leading to the anterior surface of the brain, which is continuous 

 with the epidermis, is shown, and also the digitate processes which 

 project into the coelom. The mouth and oesophagus lie to the left. 



2. On some Mammals from Central Peru. 

 By Oldfield Thomas, 



[Eeceived April 7, 1893.] 



(Plates XXTIII & XXtS.) 



I owe to the kindness of Dr. Jean Stolzmann, the Director of 

 the Branicki Museum, Warsaw, the opportunity of working out a 

 small collection of Mammals obtained in Central Peru by Mons. J. 

 Kalinowski, which contains examples of several species either new 

 or of such interest as to deserve a record. 



The locality at which most of the specimens were obtained is 

 Chanchamayo, near Tarma, approximately in lat. 11° 20' S., and 

 long. 75° 40' E. ; in fact in very nearly the same region as the 

 specimens collected by Mons. C. Jelski and described by me in 

 1884 \ The altitude of Chanchamayo is about 3000 feet. 



The most remarkable of the species to be described is the 

 interesting fish- eating Eat, Ichthyomys siolzmanni, which I have 

 named in honoiu" of the distinguished Polish ornithologist and 

 collector, to whom I owe the pleasure of working out the speci- 

 mens. There are also two new Bats. 



Mons. Kahnowski is much to be congratulated on the excellent 

 manner in which he has collected the specimens, the care he has 

 devoted to the preservation of the skulls, and on the interesting 

 discoveries he has made in a region evidently very far from worked 

 out. 



Thanks to the kindness of Dr. Stolzmann, the British Museum 

 has been permitted to acquire, by way of exchange, the majority 

 of the specimens now described. 



1 P. Z. S. 1884, p. 447. 

 Peoc. Zool. Soc— 1893, No. XXIII. 23 



