A REVIEW OF THE MYSIDACEA 241 



lobes of the telson are furnished with two spines, the outer about twice 

 as long as the inner. The form of the endopod of the third thoracic 

 limbs and the number of articulations in the sixth joint of the endopods 

 of the remaining thoracic limbs are substantially the same in all three 

 forms. 



Figure 103. — Heteromysis odontops Walker: a, Endopod of third thoracic limb of a small 

 male, X 32; b, endopod of third thoracic limb of a large male, X 32. 



The most serious differences presented by the Panama specimens is 

 in the extent of the cleft of the telson. It is distinctly shallower 

 and has fewer spines on its margins. 



