PIirOMFA SERHIDENS. 
171 
TJchind the incisors there is a loii" sharp-edged diastema about 5’5 cm. in lengtli. 
d'he first cheek-tooth is small atul laterally compressed, with a high anterior cus]), 
slightly bifid at the summit, and a smaller posterior one, which seems to belong to the 
cingulum ; there is also a slight cingular prominence on the front of the tooth. The 
next tooth is large and complex. The anterior half consists of three cusps; one 
anterior, with a small stylid closely \inited to it in front ; the other two arranged 
transversely. There is a small accessory tubercle on the posterior slope of the outer of 
the two cusps. This anterior portion of the tooth is separated from the wider posterior 
part by a deep valley, behind which there arc two large and closely united cusps 
arranged transversely and a small accessory posterior tubercle. The nature of 
these two cheek-teeth is open to some doubt ; probably they are deciduous molars, 
though this is not absolutely certain, and although the jaw has been carefully cut 
away beneath the larger tooth no trace of any germ of the replacing tooth can be seen. 
On the whole, it seems that Schlosser is possibly right in his surmise as to the nature 
of this specimen, and it may be considered as having belonged to a young individual 
perhaps of one of the smaller species of Falmomadodon ; but since it is very small 
and there is some doubt as to the nature of the teeth, the generic name Phiomia may 
be retained till further material is available. 
C. 10007. Anterior portion of left mandibular ramus, with incisor and two cheek-teeth. Type 
specimen described and figured, loc. cit. ; also Tl. XVIII. figs. 4, 4 a. The dimensions 
(in centimetres) of this specimen are : — 
Extreme length of specimen, so far as preserved 14’2 
Length of protruded portion of incisor, measured along median 
border 3 app. 
AVidth of incisor at alveolus 1’6 
Length of symph)sis 6’5 
Greatest depth of symphysis 2 
Length of diastema between incisor and first cheek-tooth . . 6 app. 
Depth of ramus beneath second cheek-tooth 3'5 
Length of first cheek-tooth 1-2 
AVidth of first cheek-tooth ‘5 
Length of second cheek-tooth 2'7 
AVidth of second cheek-tooth 1'3 
M. 8193. Plaster cast of the above specimen. 
Made in the British Museum. 
