1921 ] Schmitt: The Marine Decapod Crustacea of California 21 



II. Bostrum 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.) 



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. (Known only from 266 + 



fathoms.) 



Gennadas, p. 23. 



Genus Peneus Weber 



Bostrum 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, Proe. Acad. Nat. Sci. Phila., 30, 98, 1878. 

 Penaeus calif orniensis Holmes, Occas. Papers Calif. Acad. Sci., 7, 218, pi. 4, 



figs. 64-69, 1900. 

 Penaeus brevirostris Eathbun, Proe. Wash. Acad. Sci., 4, 287, 1902; 



H. A. E., 10, 146, 1904. 



Pig. 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). 



