3 



masses of spermatozoa in the seminal receptacle. And those species, 

 living more than one year, copulate soon after spawning. Young but 

 mature males have very small spermatophores (ca. 5 mm. in case of 

 Penaeus canaliculatus) ; but I do not yet find such small spermatophores 

 received by females. The spermatophore, produced on the right side 

 of the animal is transferred to the right side of the seminal receptacle. 

 The part of the spermatophore which lies nearest to the genital open- 

 ing will lie in the seminal receptacle also near its opening. 



In some species the spermatophore has an appendge. It is most 

 remarkably developed in Penaeus canaliculatus. It was first described 

 and figured by Spence Bate in the Challenger Report ; but his observa- 

 tion was only superficial. In P. canaliculat?is the appendage is wing- 

 shaped. When it is taken out from the end of the ductus ejaculatorius, 

 it is flesh-colored ; but the color changes gradually to greenish yellow. 

 Its consistency too undergoes gradual changes. It is very soft and 

 somewhat elutinous at first and becomes hard and inflexible later. In 

 P. inonodon, P. ashiaka and P. latisulcatus, the appendage of the sper- 

 matophore is white, long, flexible and band-shaped. It will protrude 

 out of the seminal receptacle at first, but I do not find it. Probably 

 it will be worn away very quickly. 



Penaeus Joyneri does not form a spermatophore ; but we find on 

 the external wall of its seminal receptacle a pair of white, leaf shaped 

 bodies after copulation. These leaf-shaped bodies, are, most probably, 

 homologous to the appendage of the spermatophore in other species. 



In Penaeus ajfinis similar bodies are formed as in P. Joyneri, but 

 they are very small and they are not always found on the outer wall 

 of the seminal receptacle. In P. curvirostris we find no such appen- 

 dages of definite shape, but only a mass of glutinous body cemented 



to the depression of the external wall of the seminal receptecle or the 



e 

 thelyCurri. The hardened mass is semitransparant and yellowish in 



color. 



