232 



PROF. G. B. HOWES ON THE GULAR 



[Apr. 1 



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are somewhat smaller than usual. There appears to have been an 

 exceptional inequahty in the deposition of dark pigment on the 

 under surface of the body and hind limbs ; for with the exception of 

 the right member, which was unusually dark, these parts were but 

 little coloured (see fig. 1). 



Fig. 1. 



Gular sac of Rhinoderma darwini, adult male. 



Ventral view of the trunk, the right half of the yentral integument having been 

 removed to show the underlying gular brood-sac, s.g ; multiplied two 

 and a half times. 



On slitting up the ventral integument, as shown in fig. 1, the 

 immense gular sac was at once exposed for its whole length. It 

 occupied, as will be seen, the interspace between the body-wall and 

 ventral integument. Anteriorly it was rounded, extending forwards 

 to near thementum, while posteriorly it was prolonged backwards into 

 two insignificant cornua. The entire sac was bilaterally symmetrical, 

 and it appears to have equalled in capacity that of any specimen 

 examined by Espada. 



