1895.] HYOID BONE OF CERTAIN PAREOTS. 169 



slender than in P. erithacus. It is also more curved, concave 

 downwards, and presents a lateral sigmoid flexure, the anterior 

 curve whereof is convex outwards, ^^hile the more distal one is 

 convex mesiad. It also expands slightly more transversely at its 

 distal end. 



The ceratohrancJiial is much like that of P. erithacus, but 

 slightly less expanded laterally and a little more curved, concave 

 mesiad. 



LoEItrS FLATOPALLIATUS. (Fig. 3, p. 168.) 



The hyoid of Lorius jlavopaUiatus agrees with that of Lorius 

 domicella except in the following few particulars. 



The hasihyal is more strongly and sharply bent dorsad towards 

 its preaxial end. The two lateral halves of its posterior margin 

 form a more decided angle with each other, open forwards. Each 

 postero-extenial margin of the basiliyal plate forms a much more 

 marked and smaller angle with the proximal part of the crus of 

 the parahyal arch. The crura of the arch are somewhat shorter, 

 its symphysis being much longer and more pointed. The sym- 

 physis curves, antero-posteriorly, more strongly concave down- 

 wards. 



The CH^oc/ZossmH has its constitnent halves diverging more preaxiad. 

 Seen laterally the anterior end of each entoglossal develops three 

 short, vertically superimposed marginal processes. 



The uroht/al is not so much bent ventrad towards its distal end. 



The hypuhranchial is relatively slightly shorter. 



The ceratobranchial is less curved. 



Eos EETICULATA, (Fig. 4, p. 170.) 



Basihyal — This bone in Uos reticulata has its expanded posterior 

 part intermediate in form between those of Lonus domicella and 

 Lorius flavopallidtus. The angle formed by the two sides of its 

 posterior margin is more like that in the former, while the shape 

 of its external margins (behind the origins of the crura of the 

 parahyal arch) are more like those of L. JlavopaUiatus. The crura 

 are rather shorter than in either of those species, though the 

 symphysis of the arch is elongate, but not so much so as in the 

 last-named species. The dorsal cup-like excavation at the preaxial 

 end of the bone is as marked as in either of the before described 

 forms. 



The uroJiyal is very short and bent ventrad at its distal end as 

 in L. domicella. 



The entoghssum has its two lateral parts not so much diverging 

 preaxiad as in L. Jlavojxilliatus. The cartilage joining them 

 anteriorly is medianly notched in front and somewhat medianly 

 prolonged behind. Both the lateral processes of each entoglossal 

 are well developed. 



The liypohranchials are relatively shorter and stouter than in 

 Lorius, but with a similar sigmoid flexure. 



