272 THE ZOOLOGIST. 



about a third of the depth of the gill-lamina below it. The inner 

 side of the first and both sides of the second and third arches 

 have conical tubercle gill-rakers. All these tubercles are soft and 

 distantly spaced from each other, so they do not make a close filter. 

 There are only four branchial arches. The upper pharyngeal 

 teeth are in a long patch, broader at the top than at the bottom; 

 on the second and third epibranchials these teeth are cardiform. 

 The lower pharyngeal teeth are in two small elevated lumps at 

 the forward end of the fourth arch and very far forward from the 

 oesophagus, and are strong cardiform teeth. (Fig. III.) A small 

 piece of black paper was put between the two sets of the lower 

 pharyngeal teeth, before the photograph was taken, to facilitate 

 locating them ; they are to be seen to the right and left of this 

 little black mark. 



(To be continued.) 



