198 Bulletin Vanderbilt Marine Museum, Vol. VI 



orange ; on the sides of the carapace are six to eight oblique di- 

 vergent lines of the same color, one of which begins on each side 

 of the base of the rostrum ; three radiate from the orbits of the 

 eyes ; one is nearly transverse ; there is also a spot on the cardiac 

 region. Antennae and antennulae orange ; legs are banded with 

 orange." 



Stimpson, describing a Pacific specimen, gave essentially the 

 same pattern, except that the color bands were reddish-brown on 

 white. Other writers have described Pacific specimens as banded 

 with purplish-red on cream. 



Technical description: Species small. Carapace rather 

 stout, compact, dorsally broad, produced to a median rostral carina 

 from about half-way its length, this carina continues forward 

 dorsally as far as the first peduncular article of the antennulae, 

 as a thin, laminate carina obliquely truncate distally, serrate with 

 five or six teeth and an acute tip; the lower lateral margin is 

 slightly expanded into a carina-like margin that is continuous 

 with the orbital margin. The carapace has a bent-in, or depressed 

 area behind the eye. The antennal spine is acute, the anterolateral 

 angle is produced and closely appressed to the body. The abdomi- 

 nal segments are also broad and have capacious epimera on the 

 first three segments, while those on the fourth to seventh seg- 

 ments, inclusive, are rather abruptly tapered and deflexed; the 

 sixth segment is not greatly elongated, about two-thirds as long 

 as the short telson and posteriorly sinuate with paired triangulate 

 processes ; the telson is only one-half as long as the uropoda, dor- 

 sally slightly convex without a median carina, as noted by Ver- 

 rill ; laterally the margins taper to a narrow subacute apex which 

 terminates in a median papilla. There are two pairs of articulated 

 spines present, one of each pair situated on either lateral margin, 

 the proximal pair placed about midway the telsonic length, the 

 second pair half-way between the first pair and the distal mar- 

 gin; the distal telsonic margin bears six spines, the submedian 

 pair being half as long as the second, or intermediate pair, which 

 are quite long, about half as long as the telson, each tapered, 

 triangulate ; the outermost pair are slightly shorter than the sub- 

 median pair, but a little larger than the preceding pair of spines 

 on the lateral margin. The uropoda have a small peduncle and 

 broad, long oval blades, the maximum width being slightly more 

 than one-third the length; the outer blade has a strong sutural 



