858 PROCEEDINGS OF THE ACADEMY OF . [DeC, 



They bear a close resemblance to ]\Iarenzeller's figures of the iincini of 

 T. cincinnatus (Fabricius), but the height is greater in proportion to the 

 length and the body and beak are more nearly equal in length. Those 

 on the anterior segments usually have two teeth on the vertex of the 

 crest above the beak (fig. 176), but frequently there are three (fig. 17c) 

 or even a fourth small one. The exact arrangement of the teeth in the 

 crest varies, two of the varieties being shown in fig. 17a. Posteri- 

 orly the uncini (fig. 18) are smaller and the number of teeth in a 

 transverse row of the crest usually more numerous. 



No color remains in the specimen and no ova or sperm to indicate 

 the sex. The fragment of tube present is membranous with scattered 

 fragments of stone and siliceous sponge spicules. 



The single specimen comes from station 4.235, at Yes Bay, in Behm 

 Canal, at a depth of 181 fathoms and on a bottom of green mud. 



Amphitrite palmata sp. nov. (Plate XLIV, figs. 19 to 22.) 



Several specimens of this species occur in the collection. They 

 resemble A. affinus very closely in most respects, but differ decidedly 

 from that species in the form of the branchiae, which have no elevated 

 and branched base and no indication of dichotomy among the branches. 



Complete specimens measure from 40 mm. to 88 mm. long, the last 

 being 5 mm. wide across the thorax. The segments number from 62 

 to 64, those from V to XX being setigerous. 



The general form is almost exactly as figured for A. affinus by Malm- 

 gren. Somites II, III and IV present similar slight lateral wings in 

 successively ascending positions. The tentacles are moderately num- 

 erous and have a length of about five times the diameter of the thorax. 

 No eyes can be detected on any of the specimens. The lower lip is 

 square and rather prominent. Swollen glandular areas occur inter- 

 segmentally at the level of the gills on somites V to XIII ; and ventral 

 plates extend from III to XIII inclusive, the first three being very 

 short. All of the segments are rugous and iDiannulate and taper 

 gradually to the pygidium. The anus is a vertical slit surrounded by 

 papillae. 



Most characteristic are the gills (fig. 22) which occur in three pairs 

 on somites II, III and IV. Their bases are exceedingly short, so that 

 the filaments are nearly sessile. They are expanded and flattened and 

 the filaments spread regularly in a palmate fashion. The filaments 

 are slender and when contracted are thrown into tight spiral coils. 

 Full-grown specimens have 13 to 18 on the first, 10 to 12 on the second 

 and 7 to 9 on the third a;ill. 



