594 A. JE. Verrill — Tkinicata and Molluscoidea of the Bermuda^. 



Biflustra dentata Busk is common on Sargassum, found on the 

 beaches. Stegano2)oreUa elegcms (Edw.) Smitt is common on dead 

 corals, both in encrusting and in free foliaceous forms. 



The most interesting species was a curious species of the family 

 Pedicellinidce which forms large groups on the under side of stones, 

 or on ascidians, sponges, etc., at low-tide mark. When disturbed 

 it bends its stalks over to one side with a rather sudden jerk, 

 which is sure to attract the attention of the collector when the clus- 

 ters are large. This motion is effected by means of strong muscles 

 lodged in a cylindrical dilation of the base of the stalk. It belongs 

 to the genus Barentsia of Hincks or Aseopodaria* Busk. 



PEDICELLINIDiE. 



Barentsia timida, sp. nov. 



Plate LXX. Figure 4. 



A large species forming extensive groups, connected by slender 

 round stolons, that usually branch at right angles, from under the 

 base of each zooid. 



Stem not very long, varying in length from 3 to 5 times as long 

 as the height of the body, its basal portion, for a length equal to 

 about the height of the body, much enlarged, cylindrical, tapering 

 abruptly to the slender portion, and containing a large deflector 

 muscle ; above this the slender stem gradually increases in size dis- 

 tally; one or two annulations at the base of the body; the enlarged 

 basal portion is covered with numerous fine annulations ; the slender 

 part appears punctate, owing to small tubular extensions of the 

 lighter yellow inner layer, but these usually do not cause any eleva- 

 tions of the exterior. 



Body cup- shaped or wide campanulate. Tentacles numerous, long, 

 slender, curled in contraction. 



Height of stems, 4-6'"'" ; of basal enlargement, 0.75 to 0.90'"" ; its 

 diameter, about 0.3'"™; height of body, 1'"""; its diameter, 0.8 to l""". 



On under side of stones, on sponges, corallines, ascidians, etc., at 

 low-tide, common. 



This species is closely allied to B. discreta (Busk), Voy. Challenger, 

 xvii, p. 44, pi. X, figs. 6-12. The latter has, however, a shorter and 

 more strongly annulated basal cylinder and also several annulations 

 of the stem below the base of the cup ; its tentacles are only 12 in 

 number. 



* Mr. Busk (op. cit., p. 41) admits that Barentsia has priority of publication, 

 although he had himself previously distinguished the genus in MSS. 



