112 Bulletin Vanderbilt Marine Museum, Vol. VI 



small distal tooth at the upper margin ; propodus, 4 mm. long ; the 

 dactyl, 0.5 mm. long, tapered, triangulate, biunguiculate, with two 

 to three secondary spinules along the inferolateral margin. The 

 propodus is armed along the entire lateral margin with a series 

 of seven or eight acute, articulate spines. 



There are five pairs of biramous pleopoda; each has the pe- 

 duncular article strong, and both blades large, ovate, ciliated. The 

 specimen carries between 400 and 500 eggs. 



The entire surface of the carapace is marked by fine wavy 

 lines in nearly vertical series. Similar lines pattern the abdomi- 

 nal terga, but occur in an approximate concentric, longitudinal 

 arrangement on the median area of the second and third seg- 

 ments and longitudinally on the epimera of these segments, 

 while on the fourth, fifth, sixth segments and the telson the 

 lines again become approximately transverse, fading out on the 

 telson. The third abdominal segment is greatly produced pos- 

 teriorly in the median region, dorsally convex, hump-like, with 

 the posterior margin forming a median peak, on either side of 

 which it is concave to the epimeral border, which is widely con- 

 vex. The third segment is one and one-fourth times as long as 

 the sixth segment. The fourth, fifth and sixth segments are bent 

 downward, successively narrowed, the fourth and fifth segments 

 being approximately subequal, with the posterior margin notched 

 in the median lateral line and the postlateral angle produced, 

 acute; the sixth segment is one and four-fifths times as long as 

 the fifth, or four-fifths as long as the telson and produced to an 

 acute triangle above the base of the telson and a smaller angu- 

 lation at the outer base of the uropod. The telson has the pos- 

 terior margin narrowed, nearly truncate, a very little rounded, 

 with a pair of small submedian spines, and outside of these a pair 

 of long, articulated spines, with a few long hairs interspersed 

 from the under margin ; on the dorsal surface there are four pairs 

 of articulated spines in longitudinal series, the fourth pair of 

 which is subdistal. The uropod peduncle is unequally bidentate 

 distally, the larger triangle occurring above the base of the outer 

 lobe ; both blades are narrowly ovate, each a little longer than the 

 telson, with the distal margins regularly setose; the outer blade 

 has a subdistal tooth on the outer lateral margin. 



The eye is quite large, the cornea hemispherical, deeper and 

 larger than the stalk, upon which it is set obliquely terminal, the 



