68 BULLETIN OF THE 



teeth on the anterior part of the mesial edge are very small, though back of 

 these small teeth there are about as many and as large teeth as on the mesial 

 edge of the right mandible. The protognathal lobes of the first maxilla 

 (PI. XII. fig. 2) are approximately equal in size, broad at the ends, and armed 

 as usual with slender spines upon the distal, and numerous setae upon the prox- 

 imal lobe. The endognath is small, obtusely pointed, and armed with a very 

 few marginal setae and with two slender spines upon a small fold on the ven- 

 tral side near the tip. The protognathal lobes of the second maxilla (PL XII. 

 fig. 3) are very unequal, the proximal lobe is broad but very short, while the 

 distal is long and deeply divided into two narrow and obtuse lobes. The 

 endognath is unsegmented, short, and narrowed to a slender tip. The sca- 

 phognath projects anteriorly slightly beyond the endognath, and both ends 

 are broad and evenly rounded. 



The protopod of the first maxilliped (PI. XII. fig. 4) projects very little 

 anteriorly, and is obscurely divided into a very small proximal and a large 

 distal lobe. The endopod is well developed, and composed of three segments, 

 of which the proximal is very short, broader than long, the second nearly three 

 times as long as broad, the terminal a little smaller than the second and 

 lanceolately pointed, and all the segments margined with setae. The exopod 

 is a very large lamelliform lobe longer than the endopod, about a third as 

 broad as long, expanded and broadly rounded in outline distally, and edged 

 with plumose setae which gradually increase in size distally along the margin. 

 The epipod is small, branchial, with the anterior and posterior parts nearly 

 equal. The ischium in the second maxilliped (PI. XI. fig. 5°) is much shorter 

 than broad ; the merus between two and three times as long as broad ; the 

 carpus a little narrower than the merus and about as long as broad ; the pro- 

 podus bent back upon the merus as in most Palaemonidae, a little longer than 

 the merus, nearly half as broad as long, and obliquely truncated along the 

 mesial edge for the articulation of the dactylus, which is more than twice as 

 broad as long and armed with setae and slender spines as is the mesial and 

 anterior edge of the dactylus. The exopod is nearly as long as the endopod, 

 slender, and multiarticulate and flagelliform for more than half its length. 

 The epipod is broad at base, somewhat triangular, and bears a large phillo- 

 branchia. The endopod of the external maxilliped reaches a little beyond the 

 middle of the antennal scale, and is slender and composed of three segments, of 

 which the proximal is the longest, reaches as far forward as the antero-lateral 

 angle of the carapax, and is strongly curved and dorsally compressed in the 

 middle opposite the mouth ; the middle and the distal segments are straight, 

 the middle about half as long, and the distal nearly as long, as the proximal ; 

 all the segments are more or less setigerous. The exopod is slender, multi- 

 articulate, flagelliform, and about as long as the proximal segment of the endo- 

 pod. The epipod is narrow, lamellar, nearly as long as the middle segment of 

 the endopod, and lies between the branchiae of the ninth and tenth somites. 



All the thoracic legs are furnished with exopods like those of the external 

 maxillipeds, and the first, second, and third pairs are furnished also with epi- 



