1921] Schmitt: The Marine Decapod Crustacea of California 21 
II. Rostrum if armed, toothed above only. Setose scale on inner border of first 
segment of antennular peduncle wanting or quite rudimentary. 
A. Endopodites of second maxillipeds of the usual subpediform shape. (Known 
only from 331-++ fathoms. ) 4 
Benthesicymus, p. 22. 
B. Endopodites of second maxillipeds with merus thin, broad, and compressed, 
expanded into a thin, oval leaf-like process, or lamina, completely con- 
cealing the next three joints when flexed. (Kuown only from 266 + 
fathoms. ) 
Gennadas, p. 23. 
Genus Peneus Weber 
Rostrum well developed, toothed above and below. Outer edge of basal joint 
of antennular peduncle produced anteriorly into a spine; inner edge, proximally, 
with a conspicuous, twisted, setose scale; antennular flagella shorter than the cara- 
pace. Mandibular palp large and broadly foliaceous, two jointed, second joint 
vastly larger than the first. Exopodites on all or all but the last pair of legs. 
Peneus brevirostris Kingsley 
Peneus brevirostris Kingsley, Proc. Acad. Nat. Sei. Phila., 30, 98, 1878. 
Penaeus californiensis Holmes, Oceas. Papers Calif. Acad. Sci., 7, 218, pl. 4, 
figs. 64-69, 1900. 
Penaeus brevirostris Rathbun, Proc. Wash. Acad. Sci., 4, 987, 1902; 
H. A. E., 10, 146, 1904. 
(Q. 
c 
Fig. 9. Peneus -brevirostris; a, hand and carpus of first pair of legs; b, hand 
and carpus of second pair; c, hand and carpus of third pair; d, lateral view of 
carapace; e, lateral view of abdomen (after Holmes). 
