MALDANE SARSI. 347 



This author also gives a table showing the number of hooks in the rows from the 

 second to the nineteenth, and, so far as can be judged, they seem to increase, as a rule, 

 with age and size. In the majority of the setigerous processes, that is after the fourth, 

 they are in a double row. 



In various small examples a triangular shield-shaped elevation occurred on the 

 dorsum between the fifth and sixth bristled segments, with the broad end in the front, on 

 bold transverse folds. In large examples transverse folds in this region are not 

 infrequent : such appear to be due to contraction in preparing. 



The tubes are formed of greyish mud and are rounded and generally cylindrical. 

 They retain their shape in the preparations, though when pressure is applied by the 

 fingers they readily crumble. Some present transverse elevations or ridges, and 

 arenaceous Foraminifera are included in the thick coating of mud over the central tube 

 of tough secretion. A few of the large tubes are much more consistent, since small 

 stones and tough secretions enter largely into their structure, whilst others have a very 

 firm (brittle) outer layer of secretion and brown mud, whilst the thicker interior layer 

 is softer. Moreover, the tube may be slightly moniliform with an enlarged ring toward 

 one end, which tapers to a thin termination. Such brownish moniliform tubes are coated 

 with grey mud, showing that either a change of site or a selection of materials had been 

 made, unless it is to be supposed that the secretion affects the hue of the mud. In a 

 few, hard flinty grains cause the firm tube to have a surface like sand-paper. The tube 

 is remarkable in so far as the sand can be removed from the very thin, transparent lining 

 of secretion. 



This is a northern form, abundant in the colder areas, but, so far as known, it has 

 not hitherto occurred in the British area. A variety (M. Sarsi, var. antarctica) has 

 recently been described by Arwidsson, from Graham's Land, South Georgia, and other 

 parts of the Antarctic region ; so that the distribution of this species is noteworthy. 



A minute form in a tube of secretion coated with fine sand was dredged in Bono Bay 

 by the ' Porcupine ' in 1870. In external appearance, viz. in the slope and structure of 

 the cephalic plate, and in the truncated and notched anal plate, it closely resembles 

 M. Sarsi, though perhaps the latter (anal plate) is more circular. The hooks also appear 

 to correspond, having in lateral view two teeth behind the great fang, and indications of 

 a third. 



It is doubtful if the Maldane glebifex of Grube 1 (1860) is other than this species, the 

 author having described and figured the anterior for the posterior end and vice versa. 

 The figure of the hook is too elementary for discrimination. 



Maldane glebifex, Grube (after Arwidsson), Zoologische Jahrbucher. 



The anterior region dotted with small, round, brownish specks. The cephalic keel is 

 present posteriorly, but is lost on the anterior plate. Two naked segments posteriorly. 

 The posterior shield has its ventral border serrated. The anterior and posterior parts of 

 the third bristled segment and the anterior part of the fourth with glandular thickening. 

 The fifth has at its posterior part small half-moon-shaped glandular bands. The sixth 

 posteriorly has small, lateral, glandular spots (under the nerve-cord), and the following 

 segments have similar flecks. The posterior shield with glandular bands at the border. 

 1 ' Archiv fur Naturgesch./ Bd. xxvi, p. 92 ; Taf. iv, figs. 4 — 4 c. 



