220 



PEOF. E. SELENKA ON THE GEPHYREANS 



On the G-ephyreans of the Mergui Archipelago, collected for the 

 Trustees of the Indian Museum, Calcutta, by Dr. John 

 Anderson, F.R.S., Superintendent of the Museum. By 

 Professor Emil Selenka, Erlangen. (Communicated by 

 Dr. John Anderson, F.R.S., F.L.S.) 



[Eead 21st April, 1887.] 



Genus Phascolosoma (sensu stricto), 



Selenka, De Man, and Bulow. 



Longitudinal musculature continuous. Numerous finger-shaped 

 tentacles, surrounding the mouth in rings or clusters. A pair of 

 ciliated tubercles over the cerebral ganglion. Intestinal canal 

 consisting of many spiral convolutions, not attached at the hinder 

 extremity. Hooklets present or absent. Two free nephridia. 

 Eggs round. Retractors four, two, or one. 



In all seas. 



1. Phascolosoma pelltjcidum, Kef. 



Phascolosoma pellucidum, Keferstein, Beitrdge zur anatom. und systema- 

 tischen Kenntniss der Sipunculiden, Zeitschr. f. wiss. Zoologie, Bd. xv. 

 1865, p. 433, Taf. xxxii. tigs. 26, 27. 



Phascolosoma pellucidum, Selenka, De Man, and Billow, Die Sipuncu- 

 liden, eine systematische Monographic, in Semper 's Reisen im Archipel der 

 Philippinen, ii. 4ter Bd. Erste Abtheilung, 1883, pp. 32-34, Taf. iv. figs. 

 44-49. 



Three large specimens, measuring 8-11 centim. 



Genus Phymosoma, 

 Selenka, De If an, and Bulow. 

 Longitudinal musculature separated into bands. Tentacles 

 numerous, not arranged round the mouth but placed beyond it on 

 1 Ik; dorsal side in a single series forming three quarters of a circle. 

 Body covered with papillae. Hooklets generally present on the 

 introvert. Eggs elliptical, flattened. Pour retractors. Two eye- 

 spots. 



Mostly tropical forms. 



2. Phymosoma japojtccttm, Grube. 



Phascolosoma japonicum, Chrube, 54. Jahresb. der schlesischen Gesell- 

 sclioft fur vateri'iiidische Culfur, Brcslau lH/7> p- 73. 



Phymosoma japonicum, Selenka, De Man, and Billow, Die Sipunculiden, 

 eine syslcmotische Monographic, in Semper?* Reisen im Archipel der Philip- 

 pinen, ii. 4ter Bd Erste Ahth. 1883, pp. 76-7H, Taf. ii. figs. 18-19, Taf. x. 

 figs. 145-146. 



Seven specimens, from 4-£ to 1\ centim. in length. 



