56. GENYOBOGE. 177 



a. AdiUt. India. Presented by Sir J. Richardson. 

 6. Adult: stuffed. Louisiade Archipelago (15 fathoms). Voyage 

 of the Rattlesnake. 



c. Adult: skeleton. Aniboyna. From Mi". Frank's Collection. 



d. Adult: stuffed. Mozambique. Presented by T. Thompson, Esq. 



Skeleton. — The skull is distinguished not only by the development 

 of all the bones situated in a vertical direction, as we find usual in 

 Genyoroge, but by much more developed muciferous channels than 

 in G. bengalensis, offering a further example of how little importance 

 is the generic character drawn from this modification of the bones. 

 The occipital crest is exceedingly high, with a rounded superior 

 angle, and extends far between the orbits ; in front it is separated 

 into two laminae, which, parting from each other in G. bem/alensis, 

 are close together in this species. There are two other ridges on 

 each side of this crest, both arising from above the orbit : the in- 

 terior, parallel to the occipital crest, articulates with one of the 

 processes of the suprascapula, and terminates behind in a prominent 

 spinous point ; the exterior muciferous ridge descends in an oblique 

 direction and articulates with the other process of the suprascapula. 

 The space between the eyes is very uneven on account of ridges and 

 cavities. The praeorbital bone is large, as large as the area of the eye, 

 trapezoidal, and partly excavated by flat and low muciferous cavities ; 

 the suborbital arch muciferous, but otherwise as in G. bengalensis. 

 The maxillary bone short, not longer than the prasorbital, gradually 

 widening behind, with a nearly straight-lined upper edge and a 

 rather concave one beneath. The operculum has only one very 

 short point, forming the end of an interior low crest ; there is only 

 a rounded prominence at the place where another point is generally 

 found; it is produced by an emargination beneath. The pra3oper- 

 eulum is minutely serrated above and partly in the notch, the den- 

 ticulations being coarser, and radiating at the angle and the inferior 

 Hmb; the sub- and interoperculum are entire; the knob of the 

 latter is an obtuse point directed upward. The coracoid bone as in 

 G. bengalensis. 



Of the entire system of muciferous channels, that pair running 

 along the upper sm-face of the skull is most deVeloped ; it is formed 

 by the turbinal, entirely modified into a tube,- and by the principal 

 frontal bones. This channel has three openings : in front, the 

 anterior opening of the turbinal ; secondly, an opening formed by a 

 turbinal and frontal bone together; finally, a third in the frontal 

 bone alone, above the anterior margin of eye ; this channel is blind 

 behind and does not communicate with the second, as in Acerina 

 cernua. The second arises from above the posterior margin of the 

 orbit, and soon separates into two stems : one of them, the scapular 

 stem, follows the exterior ridge on the parietals, ^nd being curved 

 upwards and backwards, passes into the suprascapula and the upper 

 supi'ascapular process, where it is lost : the other, the suborbital 

 stem, follows the suborbital aich and expands on the praeorbital ; its 

 openings are small and irregular. TJie tliii'd, or rather the foiuth 



