DB, W. BATED ON NEW TUBICOLOfS ANNELIDES. 19 



through its waters, and this through spaces of hundreds of miles ! 

 Every corner and crevice, every point occupied by living beings, 

 which, as they become more minute, increase in tenfold abun- 

 dance." (p. 17.) 



In the same collection of Annelides we possess specimens of a 

 tube imbedded in madrepore collected by Mr. John MacG-illivray 

 from the coral reef of the island of Totoga, one of the Piji group. 

 From its appearance and habitat I consider it to belong to the 

 same genus as the last, and propose naming it. 



7. Ctmospiba MacGtilliveati. (PL II. fig. 3, mouth of tube.) 



Only the mouth of the tube is distinctly seen, the remainder 

 being imbedded in and completely incrusted by the substance of 

 the madrepore. The mouth of the tube is round, smooth inter- 

 nally but of a dark colour tinged with red, and at the upper 

 edge is strongly marked with the projecting point of a keel, which 

 most probably runs along the dorsal surface of the tube. This 

 projecting point is somewhat tongue-shaped, of a smooth surface 

 and a reddish colour, and reflected a little upwards and backwards. 



It is to be regretted that the specimens Ave possess are so few 

 in number, and the fragments of the madrepore Avhich contain the 

 tubes so small that it is impossible to ascertain the length of the 

 tube. The circumference of the mouth of the largest specimen is 

 fully f ths of an inch. 



Hal. Coral reef of Totoga, Fiji Islands. (Brit. Mus.) 



G-enus Pomatostegus, Bchmarda. 



When Philippi reconstructed the family SerpulidaB, taking the 

 structure of the operculum as one of his chief generic characters, 

 only two species of the genus Cymospira had then been described. 

 One of these, the type of the genus, was the Serpula gigantea of 

 Pallas, =the Terebella hicornis of Abildgaard, distinguished by its 

 having an operculum consisting of an elliptical shallow plate 

 armed with two ramified horns. The other was the Terebella 

 stellata of Abildgaard, distinguished by the operculum being as 

 it were midtiplied, or raised up in three different floors or stories 

 united to each other by a central column. Following up the 

 subdivisions of Philippi founded on the operculum as a character, 

 Schmarda has since founded a new genus for this latter annelide, 

 which he has called Pomatostegus, and has described two new 

 species from the coral reefs of Jamaica. The w^orm which I have 

 now to describe belongs to this genus, but is a native of the seas 



2* 



