N0.1311. SOME NEW DEEP SEA cnVSTACEANS— BENEDICT. 277 



d. Rostrum arimvl with lateral spine.''. 



i\ RostruMi armed with a single pair of lalcral sidiieH. 



/. Posterior marixiri unarmeil n-iiidct'd, \>. :;'2l) 



/. Posterior margin armed with .^ipiiies. 



g. Spines four to six mpinifer, p. 327 



g. Spines numerous, small sericcn, p. 326 



e. Rostrum armed with two or more spines on each side. 



/. Eyes immovable op<descenH, p. 287 



/. Eyes movable hamata, p. 320 



d. Rostrum not armed with lateral spines. 



c. Armature of the abdomen not confined to the median line. 

 /. Armature of abdomen consisting of small conical spines, uniform in 

 size, placed in a double row on the second, third, and fourth 



segments scohina, p. 325 



. Annature consisting of prominent spines on the median line and a 

 single spine on each side. 



g. Spines on the posterior margin of carapace, 2 serratlfronn, ji. 326 



g. Spineson the posterior margin of carapace, more than 2. /ia.sfi/i'y, p. 284 

 e. Armature of abdomen confined to the median line. 

 /. Gastric area armed with 1 or more spines or tubercles. 



g. Rostrum depressed latimsii-ls, ]>. 321 



g. Rostrum curved upward. 



h. Median line on the gastric area free from spines irillosa, p. 330 



h. Median line on the gastric area armed with spines or tubercles. 

 i. Orbicular sinus well developed. 



k. Rostrum strongly curved upward and much longer than the 



eyes robnsta, p. 325 



A'. Rostrum nearly horizontal and but little longer than the eyes. 



toirnsendi, p. 290 

 ?. Orbicular sinus lacking. 

 k. Carapace of nearly uniform width, widest in middle, not cut 



up into lobes simplex, p. 326 



k. Carapace not uniform in width, cut into lobes by cervical 

 sutures. 



/. Broadest near anterior end longirostris, p. 322 



I. Broadest near posterior end curvirosira, ]>. 319 



/. Gastric area lacking spines or tubercles. « 



g. With sharp anterolateral spines abbretiata, p. 315 



g. Anterolateral spines wanting. 



/(. Rostrum short, broad, concave, apex rounded. 



/. Carapace of uniform width longimana, p. 322 



i. Carapace broadest in front carimpt's, p. 317 



}). Rostrum acuminate. 



/. Lateral margins of carapace straight quadrata, p. 325 



/. Lateral margins arcuate aspera, p. 316 



MUNIDOPSIS ACUMINATA, new species. 



The rostrum extends beyond the eyes about one-third of its h'nn-th: 

 the base is l)road; the rostral point is twice as long as the lateral 

 points. The antennal spines are a little smaller than the rostral spines. 

 The spines of the lateral margin are four in number, including- the 



« M. aspera may be an exception, as the rough granules are general on the carapace. 



