14G BULLETIN OF THE 



In Iho peccary,* Dicofylo!, tori[Hatai< (I'hife III. I'li^'s. 1-3), tlie cncra- 

 iiiiil surface is imiformly concave, and presents scarcely any angnlatioii 

 inicriorly. ilence, the indications of separation of the ectoturbinals 

 from the endotnrbinals arc indistinct. 'J"hc liasal aspects of the endo- 

 turliinal jilates foi'ni well-ileiined lines on the crilii'ifonu plate, about 

 which are aiTan<,'cd a number of little jjits. From the bottom of these 

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

 these is the one fur the iirst endoturbinal ])late. The septotvuliinal sur- 

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

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

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

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

 turbinals are well defined. The former arc seen to have a less compli- 

 cated strurtui-c, an<l are arranged as converging radii from the u])i!er and 

 lateral Widls. The endoturbinals are airanged in tiei-s, and constitute, 

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

 dian surface. 



The cctotur'iinals arc nine in number. 'I'lie first ectoturbinal and 

 the nasotm-binal arc confluent. The foi-mer ])rcsents a convex uniform 

 surface above. ITie nasotm-binal is distinct fi'om the meso-ethmoid. 

 The second ectoturbinal is of the same size as the first, but more dis- 

 tinctly biconvolute at the V)asc. The third is the longest of the ecto- 

 turbinal scries, and readies the centre of the ectoturbinal space. Three 

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

 of the section. The endoturl)inaIs arc also nine in number, four of 

 them only reaching the median surface. They are much more convo- 

 lute than in the ectoturbinals, and present a numljcr of secondary folia. 



The sphenoturl)inal is seen distinctly united to the moso-ethnioid. 



In the two-toed sloth, f Ch'>i<vpi(s didacti/lns (Plate III. figs. T), (i), the 

 cribriform ])late is without angulation, as seen in the skull of the yoinig 

 of this species, and tlic cntii'c surface which answei-s to that fnr endo- 

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

 are all united antcrioily into a single transverse lamina, 'i'he posterior 

 non-pei'fbi'ate space e(pials in lonuitiidiual dianx'tci- one third of the 

 area (4" the cril)rifoi-n] ])lat(_'. The sc])totui-binal sjiiico is scarcely raised 

 a'oove Ihe plane of the turbinal spaces. The crista galli answers in 



* For imi'iMisi's of coiiiiiarisim, tlu' ru<'f;iiii;i! surface of tliu clhnioiil hoiR' of tlic 

 liog is fitjiuvd (I'lale 111. lig. 4), luit imt .1,'sci IIkmI. 



t For ])urposc.s of comiiarison, llic nicraiiial ami \\\>' nasal surfaces of Bnuhjpus 

 arc prcsrutcd in lig.s. 1 and 2 of l'l,;te IV., but ii'-t licrc ilrscrilicd. 



