350 ON A COLLECTION OF ECHItJRlDS, WITH AN ATTEMPT TO 



Species 23. Thalossema mellita. Codii. 



Conn. Stud. Johns Hopkins Univ. Vol. III. 1884—1887, p. 351. 



Length of body, one inch. Length of proboscis, several inches. 



Colour, dull red with a light yellow proboscis, and eight white bands representing 

 the longitudinal muscles. 



Skin, nearly smooth, but minute whitish papillae round anus. 

 Longitudinal muscles, in 8 bundles. 

 Nephridia, two pairs. 



Locality. Found off Beaufort, living in empty Sand-dollar tests (Mellita, a Cly- 

 peastrid genus). The Thalossema enters whilst small but soon grows too large to leave 

 its house. 



Species 24. Thalossema moebii. Greef. 



Greef. Acta Ac. German. Vol. XXI. Pt. n. 1879, p. 152. 



Von Drasche. Verh. Ges. Wien, Vol. xxx. 1881, p. 621. 



Fischer. Zool. Forschungsr. in Australien etc., Semon, Vol. v. Pt. m. 1896, p. 338. 



Von Drasche thinks that this species is identical with the Th. erythrogr amnion of 



Max Midler. 



But Lampert very definitely states that in Th. moebii the longitudinal muscles are 

 continuous and not broken up into bundles, a character in my opinion of more im- 

 portance than that of the number of bundles, on which so many of the species have 

 been practically founded. 



Length of body, 7 cm. extended. Diameter of body averages about 2 cm. Length 

 of proboscis, 8 cm. extended. 



Colour of proboscis is light green with bright yellow edges. The body is a dirty 

 greyish-yellow, passing in some places into violet, and violet stripes run spirally round 

 the body. 



Papillae irregularly scattered over all the body, often arranged in clumps. 



Longitudinal muscles, continuous. 



Nephridia, three pairs, with spirally twisted openings into the body-cavity. 



Anal trees, long, thin and brown, at one time stated to be without funnels, but 

 Fischer has found them. 



Sexes alike. 



Locality. Mauritius; Amboina; Upolu. In tubes and holes in the coral sand. 



