Family PENAEIDAE. 



Gennadas Bate. 

 i. Gennadas clavicarpus de Man. PI. I, fig. i. 



Gennadas clavicarpus J. G. de Man, Siboga Exp., Monogr. 39a, Part I, Family Penaeidae, 

 191 1 (text) p. 19, 1913 (plates) PI. I and II, figs. 3 — 3/'. 



Stat. 148. August 10. o°i7'.6S. I29°I4'.sE. Halmaheira Sea. 1855 m. Bottom fine, grey 



and green mud. 2 young specimens. 

 Stat. 185. September 12. 3 20' S., i27°22'.9E. Manipa-strait. From 1536 m. to surface. 5 



specimens, of which one male is almost adult, the others very young and mutilated. 

 Stat. 203. September 19. 3°32'.5 S., I24°I5'.5E. Banda Sea. p^. 1 young male and 3 still 



younger specimens. 

 Stat. 243. December 2. 4 30'. 2 S., I29°25'E. West of Banda Islands. From a depth of 



IOOO m. to surface. 3 young specimens. 



The largest of all the specimens is the male from Stat. 185, which is 31,4 mm. long 

 (carapace 7,9 mm., abdomen 23,5 mm.). At the base of the rostrum the rostral carina is very 

 slightly elevated, in the shape of a minute rounded prominence. Antennary angle of the cara- 

 pace acute, infra-antennary angle obtusely pointed. The branchiostegal spine, which in the type 

 specimen, a female, was described as small, appears in this male (Fig. 1) as a spine of moderate 

 size ; the deep groove, that from the apex of the antennary angle runs backward and obliquely 

 downward, unites with another that proceeds from the branchiostegal spine and then runs 

 farther backward almost to the level of the post-cervical groove, curving downward posteriorly. 

 The gastro-frontal groove runs first upward towards the rostral tooth, but, reaching the rostral 

 crest, it curves backward. The truncate, slightly concave tip of the telson bears between the 

 movable spines at the angles, which in this specimen are lost, three pairs of feathered setae ; 

 those of the i st or submedian pair are the longest, 0,46 mm. long, those of the 2 nd are a 

 little shorter, the setae of the outer pair still shorter, 0,3 mm. long. 



The petasma apparently agrees with the third male from Stat. 230, described by me 

 1. c. p. 22, though in this male the two laminae were not yet in contact, while in the male 

 from Stat. 185 it is well-developed. Instead of the two large rounded lobes on the distal border, 

 visible in fig. 3/ (1. c), one observes two triangular prominences, the acute tips of which are 

 curved forward ; of the two narrow teeth or prominences that occur at either side of the 



