GATTYANA OIJRROSA. 287 



Length. — A fine example from St. Andrews measured, exclusive of the processes, 

 47 mm.; and another, 42 mm. in spirit, comes from Broadhaven Bay, W. Ireland 

 (A. a. More). 



The head (Plate XXVII, fig. 5) differs from that in Lepidonotus in the relations of 

 the median and lateral tentacles, since on each side of the median the head terminates in 

 a pointed papilla (peak), the lateral tentacles being inferior. The outline of the head is 

 somewhat ovate, and in life it is rose-red. A conspicuous pair of black eyes occur 

 posteriorly on the dorsum, while a slightly larger pair are in front at the outer margin, 

 and rather below the peak on each side of the tentacle. They are not well seen from 

 the dorsum, and are fitted for anterior vision. The nuchal collar has a prominent 

 boss or papilla in the centre. The median tentacle arises from a massive base, often of 

 a slightly brownish tint, as a pale ciliated process about as long as the palpi in the spirit 

 preparations, though of course the latter are much longer in life, and having a slight 

 swelling below the filiform tip. The bases of the short lateral tentacles, which are 

 beneath the massive base of the median, have a brownish bar. They are similarly 

 ciliated, and have a slight enlargement below the filiform extremity. The cilia 

 on the tentacles are elongate processes with a slightly bulbous tip, the centre of the 

 latter and the column being granular. 



The pale palpi have numerous small papillae, which are shortly clavate in outline, with 

 a truncated tip, which has a few minute papilla. These are arranged in six rows — 

 apparently two dorsal, two ventral, and a lateral on each side, the intervals between the 

 rows being considerable. Malmgren simply says the surface is densely covered. They 

 diminish in size towards the tip, and disappear from the filiform termination. Under 

 a lens in life the organs appear to be smooth, but the minute papillae are visible under 

 a low power. 



Body elongated, somewhat elliptical in transverse section, though more prominent 

 dorsally than ventrally, gradually diminished in transverse diameter towards the head, 

 and narrowed somewhat more abruptly towards the posterior end. Bristle-bearing 

 segments 34 — 36, as Malmgren says for the Arctic forms. The dorsum is marked laterally 

 by the papillae for the scales, and the corresponding elevations in those feet bearing 

 cirri. Moreover, each segment has a transverse bar, as it were, imprinted on its 

 middle, the outer edge of the bar being especially depressed just as the surface of 

 the segment rises towards the papillae. These are continued to the fourth last segment 

 posteriorly. On the other hand, the bulging of the body caused by the proboscis 

 renders them less distinct anteriorly, though traceable in every segment. A tendency 

 to separation of these bars at the anterior border of the segment is noticeable, while 

 posteriorly the central half runs to the junction with the next segment. A median 

 streak passes along the dorsum. Ventrally, the segments show a broader lateral band on 

 each side, and a narrower median, which is opaque whitish in the centre. A little 

 behind the line of each segment anteriorly an oblique streak passes to the nephridial 

 process. The ventral surface of the body is iridescent, and in life it has a purplish 

 sheen along the median region. In others the pinkish nerve-cords and ganglia 

 form a well-marked moniliform median band, commencing behind the striated lower lip 

 as a broad stripe. The feet are dull yellow. 



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