XXX 



The ilia anteriorly are short, obliquely everted, and separated mesially by the coalesced 

 neural vertebral spines. The antitrochanter is prominent; and from it the strongly marked 

 " postacetabular " ridge is prolonged backwards to the well-marked posterior sacral spines. The 

 ilio-sciatic foramen is oval, the notch well marked and deep. The obturator notch is largely 

 ossified, so that its most anterior part is separated off as a small circular foramen. The renal 

 fosssB are large, expanded, and not deep. 



The first metacarpal has a well-developed tubercular process ; and the first phalanx of the 

 third digit articulates with the corresponding phalanx of the index, as in the Galbulidae. 



The cnemial process of the tibia is weak. There is an osseous bridge for the extensor 

 communis digUorum. The tarso-metatarse is carinated anteriorly, and has a small "calcaneal" 

 process posteriorly, with grooves for the plantar tendons. Its length about equals the second 

 digit, falling considerably short of that of the three basal joints of the third. The external 

 articular trochlea is large and transverse, and directed backwards for the reversed fourth toe. 

 The second digit is more feebly developed than its fellows. 



The other species examined by me hardly differ in any characters of importance from 

 Bucco dysoni. They have the lachrymals unconnected to the nasals, no conspicuous palatine 

 ridges, and more ossification in the region of the internasal septum. In Malaco])tila the palatine 

 ridges are co-ossified anteriorly, whilst in Micromonacha, on the other hand, they are quite separate 

 in that position. Monacha has the angular process of the mandible weaker. In all three forms 

 the obturator notch is also less extensively ossified. As will be seen by the subjoined table, the 

 number of vertebrae, as well as their grouping, varies, though the praesacral vertebrae are always 

 eighteen. 



Bucco (i3'Soni 



Monaclia nigrifrons . . . 



Malacoptila fusca 



iricromonacha lanceolata 



Oervical. 



14 

 14 

 13 

 14 



Dorsal. 



Sacral. 



12 

 11 

 11 

 12 



Caudal. 



Total 

 vertebrae. 



3o 

 34 

 35 

 35 



Eibs articu- 

 lated with 

 sternum. 



All these forms have two distinct cervical ribs. Malacoptila differs from the others in having 

 five dorsal vertebrae, the last tivo of which are fused with the " sacral " ones, and six caudals. 

 There are uncinate processes on the last cervical and three anterior dorsal vertebras in all the 

 species except Malacoptila, where the anterior dorsal alone are provided with such appendages. 

 Micromonacha, like Bucco, has inferior spinous processes (hypapophyses) on all four dorsal 

 vertebrae. In Malacoptila these are confined to the first two, whilst in Monacha they are 

 present on the first dorsal alone. 



