14G BULLETIN OF THE 



In t!ic peccary,* Dicotijlcs torquatui< (Plato III. figs. 1 -3), the encra- 

 iiial surface is uniformly concave, and presents scarcely any angulation 

 inferiorly. Hence, the indications of separation of the cctoturbinals 

 from the enduturbinals arc indistinct. 'J'he Inisal as2)ccts of the cndo- 

 turbinal })lates form well-ilelined lines on the crihriform plate, about 

 which ai'o arranged a number of little pits. From the bottom of these 

 lie the foramina of the olfactory nerves. The most conspicuous of 

 these is the one for the first eudoturbinal plate. The sci)toturl)inal sur- 

 face is on a higher plane than that of the ctlunoturbinals. The crista 

 galli is distinct throughout. The non-perforate space is nearly one third 

 the length of the cribrifonn plate. Of the nasal surfaces, it is seen on the 

 frontal section that the divisions between the cctoturbinals and the endo- 

 turbinals are well defined. The ft)rmei' are seen to have a less compli- 

 cated structure, and are arranged as converging i-adii fi-om the iipper and 

 lateral walls. The cndoturbinals arc arranged in tiers, and constitute, 

 with the median exposure of the nasoturbinal, the entirety of the me- 

 dian surface. 



The cctoturbinals are nine in nund)er. The first cctoturbinal and 

 the nasoturbinal are confluent. The former presents a convex uniform 

 surface above. The nasotuiiiin;d is distinct from the nieso-ethmoid. 

 The second cctoturbinal is of the same size as the fii'st, but more dis- 

 tinctly biconvolute at the base. The third is the longest of the ecto- 

 turliinal scries, and reaches the centre of the cctoturbinal space. Three 

 additional plates, rudimental in character, are seen on the lateral aspect 

 of the section. The endotiu'binals are also nine in numlier, foiu' of 

 them oidy reaching the median surface. They are nnich more convo- 

 lute than in the ectoturl)inals, and jn'csent a number of secondary folia. 



The sphenoturbinal is seen distinctly united to the meso-etlnnoid. 



In the two-toed sloth. t ChohcpUK diihidiihis (I'late III. figs, f), (i), the 

 cribi-ifoi-i;i ])late is without iin^'ulation, as seen in the skull of tho young 

 of this sjjecies, and the entii'e surface which answei's to that ibr cndo- 

 turbinals is marked by four plates and associated foramina. The jilates 

 are all united anterioi'ly into a single transverse lamina. 'i"he ))osterior 

 non-pei'tbi'ate s]iace equals in lonuit udinal diauictor one third of tlic 

 area (jf the eril)rii'orni jilatc The scptoturbinal spa.ce is scarcely raised 

 above the plane of the tuil)inal spaces. Tiie erista galli answers in 



* l'"iir piupn^i's (if rniiijiarisiiii, till' ciii'i'aiii;!! siirfacr >>[ tlic c'lluiioiil liuiic of tin: 

 li<.)g is lii,'uicil (I'latc IIL liy. 4t, lint not ilcsi'i-ilii'.L 



t l''i)i' jiinpdsf.s ol" coinjiai'i.smi, tlic fiicraiiial ami tln' nasal surfaces of L'nab/jtus 

 arc presented in ligs. 1 and '2 uf I'latc IV., but not liere described. 



