STEWART: NEW CRETACEOUS FISH. 193 
Enchodus amicrodus sp. nov. 
This species is based upon the right dentary bone of a single 
individual, No. 324. The dentary is shallow and supports ten or 
eleven large teeth upon the alveolar border, the anterior of which 
is slightly recurved. The external border bears no fringe of minute 
teeth, and the symphysis is not so rugose as in other species of this 
genus. 
PACHYRHIZODUS Agassiz. 
Pachyrhizodus leptognathus sp. nov. 
This species is based upon the left mandible, quadrate, symple- 
tic (?) preoperculum, and two broad flat plates which probably 
represent two more of the opercular bones. The museum num- 
ber of the specimen is 75. With the exception of the symphyseal 
portion of the mandible only the internal sides of the bones can be 
seen. The dentary is long and very slender and bears eighteen 
small conical teeth upon its superior border each of which is set 
upon a small bony tubercle similar to that found in P. caninus. : 
The symphysis is more or less tubercular and is similar in many 
respects to P. /atimentum. There are no teeth arranged in a tri- 
angle on this portion asin P. caninus. The cotylus is concave from 
before backwards and strongly convex laterally. 
The quadrate is triangular in outline and assumes a somewhat 
twisted appearance. towards the condyle. The condyle is some- 
what bifurcated in order to fit the cotylus. Just back of the quad- 
rate and closely applied to it there is a smal] element which 
probably is the sympletic. 
The preoperculum consists of a vertical and a horizontal portion 
which meet each other at almost right angles. The vertical por- 
tion is broad below, becoming much more narrow above. Just 
back of the anterior border of this part there is a well defined ridge 
extending downward to the horizontal portion. The two flat 
bones mentioned above possess no characters other than are 
shown in the figure. 
MEASUREMENTS. 
mm. 
Mandible: length of alveolar border................ Samerche Pee Mea Ss 110.5 
lengthiontcotyloidjcavity, Minsk hj pyle ENS Uke ieee Pee 3 
number of teeth in one inch............ RPG trom ae gre, Loge 5 
OWA ALe AACE Phe lee renee creat ere ee arena ae LIES Serer. a huaei lee Gy ah tailor 10 sas 32 
Pehie Lnvot SU PEkIOT OLED feces Pac aaa x siley wheter amcale payne Melee Mak 34.5 
Pachyrhizodus velox sp. noy, 
Represented by a maxillary, both mandibles, quadrate, numerous 
branchiostegal rays, and a rather long bone, partially concealed by 
