A REVIEW OF THE MYSIDACEA 



227 



Maxillule (fig. 97, b) without any protuberance on the front mar- 

 gin and the spines arming the apex of the outer lobe (third joint) very 

 short and arranged in three rows. 



Maxilla (fig. 97, c) with the exopod small and its setae feebly 

 developed, terminal joint of the palp less expanded than in D. bahiren- 

 sis and the spines arming the apex longer. 



Figure 97. — Diamysis americana, new species: a, Antennal scale, X 64; b, maxillule, 

 X 74%; c, maxilla, X 74%; d, first thoracic limb, X 74%; e, second thoracic limb, X 74%; 

 /, endopod of third thoracic limb, X 64; g, fourth pleopod of male, X 74%; A, telson, 

 X 74%. 



Carpopropodal joint of the endopods of the third (fig. 97, /) to the 

 eighth thoracic limbs divided into two sub joints, the proximal of 

 which is twice as long as the distal, nail well developed, basal joint 

 of the exopod with its outer corner rounded and not spiniform. 



Sixth somite of the pleon about one-fifth longer than the fifth. 



