(96) 



ophoral organs are mucii less hi,:hly aeveloi:ea thcU'i in the smaller 

 species 7;ith fewer coils ivi ti.e lopho-phoral crovai. 1 have ex- 

 aminea several specimeus of P. Australia v.l tr. ana vathout: fc-eu- 

 ital prodiict^i b- " '- .1 ix ^^-^ h^v^ I seen or^^ans su.ch as are pred- 

 ent in P. architecta. 



Various functions have 1 3 on ^oo^t;,n. ... ^c the lopJiophorai 

 ;: f-{.,c;no , M'lnt^ sh (j.4) vjo rkiiii, ui th P. EnsKii considers that they 

 are sensory in fxuiction, '.vhile Masterman (16) , who has studied 

 the same species, says that ti;ey are glandular ai^a that they 

 i;:ive rise to mucus which serves to hola the embryos together in 

 masseti. In other worad, n" uonsider^ ti.ein to be "viriDviJ uicvry 

 reproductive organs". Eenham (2) v/ho workea Oix P. Australis 

 and Con (4) who inves tie;aCed V. psamrnophila both r,ive these 

 organs a j-landular function; v/hile Andrews (1) thinks that in 

 P. architecta they are used in buildin^, tr.e tubes. H.B. Torrev 

 {k.2) has made tne interedtini; cbsorvaticn that in souie specimens 

 0^" P. Pacific, the l.,n.,.h.-^x ^y^,xuS ^re like those in P. Aus- 

 tralia "mile in others, they are like those ii. p. arch.i tectc.. 

 It is probable that in part of ti^e specimens ■.vhicr. Torrey ex- 

 amined, the lophophcral organs were iio t full ^ro-.M., while in tlie 

 rest, they had reachea their full development. 



My observations led me to believe that Anarews's supposi- 

 tion concerning tne tube builain^ n^nctioa 0- tne lophophoral 



