Gatty Marine Lahoratory^ St. Andrews. 113 



inward and running parallel to the median ridge, and again 

 bending outward to the groove at the deep lateral fissure. 



Immediately hihitid the mouth is a Ijniad reetanguhir 

 band of glands bounded laterally by tiie groove from the 

 deep fissure of the cephalie phitc. Glandular tissue also 

 aj)pears around the mouth. The next segment has a collar 

 with a free edge in front of the bristle-tuft, a narrow ring 

 behind eompleting the segment. Both are glandular dorsally 

 and ventral ly. 



Asycliis biceps? is a large form measuring in its ineom- 

 plete condition 110 mm. and probably exceeding 5 inches in 

 length, and having a diameter of 3 or 4 mm. The anterior 

 region is, however, absent or represented only by a small 

 papilla projecting forward from the cicatrizing end of the 

 trunk. Judging from the appearance of the s|)ecimen and 

 the condition in other forms only a single bristled segment 

 with the head and peri>tomial segment are absent, this 

 making the total number of bristled segments nineteen. 



The anterior region has somewhat the same arrangement 

 of the glandular tissue as in Muldane sarsi, though, of 

 course, it is only present in the specimen from the second 

 bristle-tuft. The second and third bristled segments have a 

 glandular ventral surface which is continuous with a nearly 

 complete dorsal investment. Dorsally, however, a blank 

 occurs from the anterior border of the fourth segment, 

 which has a thin glandular streak, backward, A thiek 

 streak also occurs dorsally opposite the bristles of the fourth 

 segment, but the great glandular belt from the ventral 

 surface appears at each side dorsally in the second ring of 

 the segment at the bristle-tuft. The first ring of this seg. 

 ment ventrally is less thickly glandular than the second, 

 which has a lozenge-shaped area with fewer glands in the 

 mid-ventral line. The great (fifth) segment shows dursally 

 the thick bifid lateral pads on each side of the bristles, whilst 

 ventrally it has a semicircular patch in front, the thin ends 

 being visible dorsally, and a broad and continuous belt 

 behind. The sixth has a glandular streak dorsally between 

 the bristle-tufts of opposite sides, and the ends of the ventral 

 belts are seen in front and at the feet, as in the previous 

 segment. Ventrally the anterior only exhibits a fissure, 

 wider laterally, between it and the continuous and broad 

 posterior belt of glandular tissue. The next (seventh) seg- 

 ment has anteriorly the dorsal ends of the glandular area of 

 each foot, as well as a small portion of the anterior ventral 

 belt seen at the sides. Ventrally a somewhat semicircular 

 glandular area lies in front, its posterior edge in the prepa- 

 Ann. cC- Mag. N. Hist. Ser. 8. Vol xi. 8 



