348 ON A COLLECTION OF ECHIUR1DS, WITH AN ATTEMPT TO 



Nephridia, one pair. 



Anal trees, moderate in size, bearing irregular branches, some simple, others much 



branched. 



Locality. Lat, 60" 34' N., Long. 4 40' E. Off the coast of Norway. H.M.S. 



Porcupine. 



Species 17. Thalassemia forrnosulum. Lampert. 



Lampert. Zeitschr. wiss. Zool, Vol. xxxix. 1883, p. 339. 



Length of body averages 3 cm. Length of proboscis, 8 mm. Diameter, 1 cm. 



Colour, white in spirit specimens. 



Papillae white, scattered uniformly all over body, and nowhere arranged in rows. 

 Skin very thin. 



Longitudinal muscles, 7 or 8 bundles. 



Nephridia, two pairs, with spirally twisted internal openings. Both pairs open behind 

 the ventral hooks. 



Anal trees, broad, sac-like organs. 



A spherical diverticulum on the rectum. 



Locality. Cavite, near Manila ; Shanghai. 



Species 18. Thalassemia gigas. Max Muller. 



Greef. Acta Ac. German. Vol. xli. Pt. n. 1879, p. 149. 



Length of body, 18 ins. when extended. 



Colour of proboscis is ashy-grey, passing at its base into dark green. The body 

 is a black-green. 



Longitudinal muscles continuous. 



The numerous papillae are more densely packed dorsally and posteriorly than elsewhere. 



Anal trees, sac-like, broad and short. 



Locality. Trieste. 



Species 19. Thalassemia hupferi. Fischer. 



Fischer. Abh. Ver. Hamburg, Vol. xm. 1895, p. 20. 



Described from an injured and incomplete specimen. 



Length of bod}- (?), 1"5 cm. Length of proboscis, 5 mm. 



Colour, light yellow. 



Papillae, small and uniformly distributed. 



Longitudinal muscles, 10 — 11 bundles. 



Nephridia, one pair, with spirally coiled internal openings. 



Locality. Nyango, W. Africa. On soft ground, 6 fathoms deep. 



