70 ON THE STRUCTUKES AND DISTRIBUTION OF THE 



The number of species so far known to inhabit these regions is as follows 

 Eegio Australis, 39, 



B. Neotropica, 176, 



R. Nearctica, 25, 



240, 



Pi. Palgearctica, 

 E.. ^thiopica, 

 R. Palffiotropica, 



9, 



0, • 



7, 



In two regions, 



16. 



2. 



In two regions, 1, 



The small proportion of species occurring in the old world, exclusive of Australia, 

 is evident, though they represent five families, while those of the new world repre- 

 sent but four. 



The slight attachment of the integuments to the muscles is a well known feature 

 of the Batrachia Anura. The manner of this attachment presents many varieties in 

 the different groups. The typical arrangement is uniform among the Raniformia, 

 but reappears frequently among the other groups ; it is as follows : A transverse 

 partition of connective tissue holds the integument along the acromials, and an- 

 other along the coracoids ; a longitudinal band on each side of the back (frequently 

 marked externally by a glandular fold) and one below it on each side of the abdomen. 

 A band or line along the hinder inferior face of the thighs extending nearly to the 

 popliteal region, and a delicate one along the upper hinder face of the same, from 

 the groove between the superior and posterior muscles. 



Among Bufoniformia the attachments are similar to the last in the Dendrobatidaa, 

 in Paludicola and in Brachycephalus. In Engystoma ovale the lateroventral line 

 is broad, or composed of several series of fibres and laminae, and in E. Caroli- 

 ne n s i s it is composed of two septa. In Pseudophryne the dorsolateral septum, as 

 well as the last mentioned, is widened ; Phryniscus is similar, except that the dorso- 

 lateral is narrow posteriorly, but rapidly widening, meets its mate on the nape, 

 forming a broad transvere attachment. In Atelopus 1 a e v i s the integument between 

 the dorso- and ventrolateral septa is attached, forming a broad lateral adherent band. 

 In Rhinophrynus d o r s a 1 i s this lateral attachment is carried so far as to leave only 

 narrow free dorsal and ventral regions, while it is further peculiar in wanting the 

 coracoid septum, as in Discoglossus and Dactylethra. Epidalea, Bufo, Phrynoidis 

 and Peltaphryne, in their numerous species, add to the Raniform structure the at- 

 tachment of the whole dorsal integument. The following table exhibits the other 

 attachments : 

 Belly broadly free, very narrow lateroventral attachment : B. haematiticus, lesche- 



naultii. 

 Do., broad lateroventral attachment : B. americanus, lentiginosus, cognatus, chilensis, 

 boreas, vulgaris, naricus, sp. Vera Paz, vallifrons. 



