REPORT ON THE GEPHYREA. 21 



Genus 9. Phymosoma, Quatrefages (Selcnka and dc Mau). 



Longitudinal musculature divided into bands. There are numerous tentacles arranged 

 in a single row, not however around the mouth, but above it dorsally in three-fourths of 

 a circle. The body is covered with papillfe. Hooks arc almost always present. The 

 intestine is coiled in a spiral fashion. The eggs are elliptical and flattened. The 

 proboscis has four retractor muscles. There are two eye spots. The members of this 

 genus arc inostly of considerable size, and the majority are tropical forms. 



21. Phymosoma japonicum, Grube. 



Phymosoma japonimm, Grube, 51th Jahresbericht der Schlesischen Geselleschaft fiir vaterlan- 



(liscbe Cultur, Breslau, 1877, p. 73. 

 Plnjmosomajcqmnimm, Seleiika and de Man, Die Sipunculidun, &c. (loc. nt.), pp. 76-78, Taf. ii. 



figs. 18, 19, Taf. X. figs. 145, 146. 



The body is compressed. The proboscis is as long as the l)ody. Even with th(,' 

 naked eye one can clearly recognise the reddish -brown papilla? on the greyish-brown 

 body. They are largest and most abundant at the base of the proboscis and at the hinder 

 end of the body. On the older specimens there may be thirty rings of hooks, and on 

 the young forms as many as a hundred. These hooks are flattened, measuring 0-07 mm. 

 in height and the same in breadth ; they have a sharply lient point with a side tooth. 

 There are not more than twenty-eight tentacles. There may be as many as thirty 

 longitudinal muscle-bands, which repeatedly anastomose. The intestine exhibits ten to 

 twelve double coils. The two segmental organs are fixed by mesenteries throughout 

 half their length. 



Habitat. — Port Jackson, shallow water. There were only two tolerably large 

 specimens. 



22. Phymosoma scolo2ys, Selenka and de Man. 



Phymosoma scolops, Selenka and de Man, Die Sipuneuliden, &c. {he. cit.), pp. 41, 42, Taf. ii. 

 fig. 17, Taf. X. figs. 138-144. 



A small species with slender body, and proboscis equal to the body in length. The 

 skin is thin. The proboscis frequently exhibits brown cross stripes on the dorsal surface. 

 The whole body is studded with small papilliB. The proboscis has about sixteen rings 

 of hooks, which are bent and measure 0-07 mm. in height, and 0-074 mm. at the base. 

 On the concave side of the bent point there is a lateral tooth. The tentacles number 

 twelve or more. There are about twenty longitudinal muscles which rarely anastomose, 

 but unite just in front of the anus to form a continuous sheath. The four retractors of 

 the proboscis originate about the middle of the body. The broader ventral retractors 



