On new Mammals from the Neotropical Region. 301 



d, main portion of nephridium, of a brown colour, due to granular 

 matter in cells ; o.7n., oblique muscles which bind down nephri- 

 dium ; l.m., longitudinal muscles ; s, notopodial bristle-sac ; 

 n, nerve-cord. 



Fig. 3. Transverse section through nephrostome. d, vascular processes 

 on dorsal lip, with excretory products between ; v, ventral lip of 

 nephrostome. 



Fig. 4. Longitudinal section through nephrostome. d and v as above ; 

 b.v., small blood-vessels which ramify over main portion of 

 nephridium ; l.m.. longitudinal muscles in body-wall. 



Fig. 5. Longitudinal section to show reproductive organs, d and v as 

 above ; c, cord of cellular tissue running down from ventral lip 

 of nephrostome to the upper part of gonad {u.g.), through which 

 runs the blood-vessel (b) ; j^i posterior dilated portion of nephri- 

 dium ; p.g., posterior portions of gonad ; b.v., blood-vessels ; 

 l.m., longitudinal muscles of body- wall ; t.m., transverse 

 muscles ; gl., glandular layer of cells on external surface of body 

 (hypoderm ?). 



Figs. G-9. Drawings from live specimens of post-larval stages of Arenicula. 

 (5. Anterior region, m, mouth ; p, pr(«tomium. 



7. Four somites of body — fifth, sixth, seventh, and eighth, h, heart ; 



V.V., ventral blood-vessel j g, gut diverticula; s, stomach j 

 n, nephridium. 



8. Dor.sal bristles. 



9. Ventral bristles, of two kinds. 



Fig. 10. Longitudinal section through portion of body, o, otocyst ; gl, 

 gullet; g, gut diverticula; s.i., sacculated part of intestine; h, 

 heart ; s, stomach ; v.v., ventral blood-vessel. 



Figs. 11-13. Sections through head-region, s.on., supra-oesophageal 

 ganglion or brain ; o, otocyst ; m, mesenchyme-tissue ; c, nerve- 

 commissure from s.ce. to sb.oe. ; sb.oe., suboesophageal ganglion ; 

 ph., pharynx. 

 11. Transverse section. 

 12 & 13.- Longitudinal sections. 



Fig. 14. Adult otocyst drawn for comparison with above. 



XLVI. — On new small Mammals from the Neotropical Region. 

 By Oldfield Thomas. 



During the past six months several collections of small 

 mammals from different parts of Central and South America 

 have been received at the British Museum, and among these 

 there are a certain number of new species, which may be 

 conveniently all described in one paper. 



Glyphonycteeis *, gen. nov. 

 (Fam. Phyllostomatidce ; group Vampyri.) 



Nose-leaf narrow, bound down to the muzzle in front. 

 Chin- warts apparently only two, one on each side of a central 



* yXvcpeiv, to chisel. 



