6 DB. w. G. EibEwooD ojs^ THE [Jan. 18, 



right angles to the length of the body. It is united by fibrous 

 tissue with the ceratohyal of each side, and is separated from the 

 pars reimiens by a space or foramen. This latter is closed by 

 loose connective tissue, and must not be confounded with the 

 hyoglossal foramen of the aglossal Toads, transmitting the 

 hyoglossus muscle. The pai's reuniens is a dense mass of whitish 

 fibrous tissue, with a straight anterior edge, shghtly convex lateral 

 margins, and a notched posterior border. It is slightly broader 

 than long, and serves to bind the ceratohyals together. The 

 second mesial cartilage, the posterior copula, correspondiug with 

 what was called " basihyal " in Pelodytes (9. p. 583), is much larger 

 than the first. It is pentagonal in shape and considerably longer 

 than broad. The pointed anterior end can be traced on the 

 ventral siu'face of the pars reuniens, reaching as far for^\-ard as 

 the foramen above mentioned, so that the length of the cartilage 

 is greater than appears in a dorsal view. The antero-lateral edges 

 abut on the ceratohyals, the lateral edges on the hypobranchial 

 plates, while the posterior and smallest edge forms the anterior 

 boundary' of the laryngeal sinus. This complete separation of the 

 hypobi'anchial plates by the second copula, which, like the presence 

 of the anterior copula, is, I believe, peculiar to the Discoglossidae, 

 was incidentally referred to in my previous contribution (9. p. 581). 

 There is in Ah/ics no triangular space on either side of the 

 posterior copula such as occurs in Peloch/tcs (9. pi. 3o, figs. 1, 2, 

 and 3, s), Pelohates, and a great number of other genera. 



The hypobranchial plates (hb) are approximately triangular in 

 shape, and the posterior exti-emity of each bounds the laryngeal 

 sinus laterally. The anterior angle runs up to the point where 

 the ceratohyal and posterior copula touch one another, while the 

 lateral angle is attached to the base of the first ceratobrauchial 

 (cb 1). The four branchial bars or ceratobranchials are united 

 with one another at their proximal ends and at their distal ends. 

 The last (cb 4) is the shortest and the broadest. The distal part 

 of the thu'd ceratobranchial is somewhat expanded, and is 

 continued beyond the commissural cartilage into a pointed process 

 which is much larger than those into which the ceratobranchials 

 1 and 2 are produced. There is no corresponding process to the 

 fourth ceratobranchial. Five to eight warty outgrowths of 

 cartilage occur on the anterior and posterior edges of the bars, but, 

 while those on the posterior border of the fourth cei-atobranchial 

 are almost obsolete, those on the anterior border of the first 

 ceratobranchial are greatly prolonged, so as to form a sort of 

 palisade. There is a tendency for these latter processes to 

 fuse in an irregular manner to form an anterior protective wall, 

 as in Pelodytes (9. p. 584). Only three pairs of spicula are 

 present. Those which constitute the free, recurved pi-oximal ends 

 of the third ceratobranchials are long (sp 3), but those of the 

 second ceratobranchial are short and stunted. There are no 

 spicula at all to the first ceratobranchial, aiad those of the fourth 

 are continued back, as usual, over that posterior part of the 



