252 DISCOVERY REPORTS 



Lumbricillus maximus (Michaelsen) (Fig. 6). 



Pachydrihts maximus, Michaelsen, 1888, p. 56, pi. i, fig. i a-e. 



Lumbricillus maximus, Michaelsen, 1905 a, p. 10. 



Lumbricillus maximus, var. Robinson, Michaelsen, 1905 a, p. 11, pi. i, fig. i. 



St. 122. 14. xii. 26. Maiviken, West Cumberland Bay, South Georgia. Shore coll. (salt water). 

 A number of specimens ; along with L. lineatus. 



St. 166. 19. ii. 27. South-east point of Paul Harbour, Signy Island, South Orkneys. Shore coll. 

 A number of specimens ; along with L. litieaius. 



St. 179. 10. iii. 27. Melchior Island, SchoUaert Channel, Palmer Archipelago. In creek to south 

 of south-west anchorage. Shore coll. Numerous specimens. 



St. 189. 23. iii. 27. Port Lockroy, Wiencke Island, Palmer Archipelago. Shore coll. A number 

 of specimens ; along with Lumbricillus lineatus and Marionina grisea. 



St. MS 70. 9. iii. 26. Maiviken, West Cumberland Bay, South Georgia. Shore coll. A number of 

 specimens. 



The present species was first described by Michaelsen, from South Georgia, in 1888 ; 

 in 1905 the same author gave additional particulars of its anatomy derived from speci- 

 mens from other southerly latitudes (the Crozets and Kerguelen), and described a 

 variety from New Amsterdam Island (in the south of the Indian Ocean). The following 

 notes, however, are perhaps not quite superfluous. 



The longest specimen met with measured 45 mm. — a giant among Enchytraeids ; 

 others were 40 mm., others 30 mm. and less; mature worms were found of all sizes 

 down to 17 mm., and some even shorter — 13, 12, and 1 1 mm. The number of segments 

 did not vary as much as the length, the limits, among the worms whose segments were 

 counted, being 55-70, and commonly the number was not very far from 60. 



The ventral setae are (3, 4) 5, 6, 7 per bundle in front of the cHtellum, and (3) 4, 5 (6) 

 behind; the lateral (3) 4, 5 in front of and (2) 3, 4 behind the cUtellum. 



In the integument are numerous gland cells staining very deeply with haematoxylin, 

 arranged in transverse rows, as in L. lineatus. 



The septal gland of segment vi bulges backwards into vii ; the portion which is in 

 relation to septum 6/7 pushes back the septum (or the posterior of the two lamellae of 

 the septum; cf. what was said under L. lineatus) after the manner of a hernia, and may 

 thus reach the level of septum 7/8. 



There is a pair of postpharyngeal bulbs, in the usual situation. 



The dorsal vessel usually begins, as described by Michaelsen, in xv, but occasionally 

 further back, in xvi or xvii. The blood stains (haematoxyhn and eosin) a dull dark purple, 

 which probably indicates that it contained a little haemoglobin during life. 



The male funnels vary much in length, from as little as 3-5 times as long as broad to as 

 much as 7-9 times, or even 10 and possibly 12 times; but Michaelsen's figure of about 

 8 times is a fair average estimate. They sometimes (? always) become narrower back- 

 wards; thus in one case the diameter at the anterior end was i6o/^, at the hinder end 

 iio/x; the hinder end may project back in a cone-like manner through septum 11/12. 

 The rim or flange at the anterior end is ( ? always) enormously broad, as shown in Fig. 6. 



