258 EDWIN CHAPIN STARKS. 



the preopercle and the hyomandibular ; premaxillaries meeting 

 at the median line on snout as usual ; no supplemental maxillary 

 bone ; lower limb of posttemporal represented by a short tri- 

 angular process from which a ligament runs to the opisthotic ; l 

 a strong ligament extends from a lateral process on the first 

 vertebra to the inner surface of the supraclavicle ; 2 the hyper- 

 coracoid foramen is a notch in the hypercoracoid open against 

 the hypocoracoid ; lower pharyngeals in contact along their inner 

 edges; vertebrae number 21 -f 14 = 35 ; epipleurals of first ver- 

 tebrae not ankylosed ; all neural processes ankylosed to vertebral 

 centra ; no parapophyses developed except on last four abdom- 

 inal vertebrae ; 3 ribs fitting into depressions with slightly raised 

 edges on the body of the vertebrae ; the first vertebra carries 

 no rib. 



Superfamily Pceciloidea. 



Ethmoid represented by a single nearly circular scale of bone ; 

 metapterygoid absent ; the symplectic forming the upper margin 

 of the cheek bones behind the mesopterygoid ; symplectic very 

 large, sending a long slender process behind the quadrate nearly 

 to the condyle of the mandible ; palatine-pterygoid arch reduced 

 to a single element, and without teeth ; 4 premaxillaries each 

 with a small backward extending process on median line of 

 snout ; premaxillaries forming lateral margin of mouth ; superior 

 pharyngeals either three toothed patches, or ankylosed into a 

 single one on each side ; the usual toothless one of first arch 

 either present or absent in the former condition, but that of second 

 arch never toothless ; posttemporal directly attached to epiotic 

 without the intervention of a ligament ; supraclavicle a very 

 small scale of bone, scarcely sufficient to separate the posttem- 



1 Four specimens have been examined and no indication found towards ossifica- 

 tion of this ligament as in Dallia. 



2 This ligament is probably the homolog of the ray of bone in Dallia pectoralis 

 that is in the same position. 



3 The process on the first vertebra to which the supraclavicle ligament is attached 

 may possibly be considered a parapophysis also. 



4 The posterior end of the palatine-pterygoid element borders the upper anterior 

 edge of the quadrate, and is braced above by the mesopterygoid, as is usual for the 

 pterygoid ; the anterior end is attached to the prefrontal and maxillary, as is usual 

 for the palatine ; making it appear probable that these two elements have ankylosed. 



