256 DISCOVERY REPORTS 



Lumbricillus antarcticus, sp.n. (Fig. 8). 



St. WS 62. 19. i. 27. Wilson Harbour, South Georgia. From haul labelled "Moss dwellers" 

 (the above is taken from the label ; in the Station List WS 62 consists of t\vo hauls, from 15-45 ^^'^ 

 26-83 m. respectively). Five specimens ; along with a specimen of Hesperodrilus sp. 



Length 6-7 mm. ; diameter o-43-o-52 mm. Segments 35-38. 



Prostomium rounded, hemispherical. Head-pore between prostomium and segment i. 



Setae lumbricilline in shape; the numbers vary within rather wide Hmits — in the 

 ventral bundles 3-7 per bundle in front of the clitelluin, 3-6 per bundle behind ; the 

 corresponding figures for the lateral bundles are (2) 3-5 and 2-5 respectively. 



The clitellum embraces segments xii-xiii ; it is absent ventrally and is not well marked 

 even dorsally. 



There are no rows of deeply staining gland cells in the integument. 



The body-cavity corpuscles are oval or of an elongated pear shape, 18-20 /a in longest 

 measurement; they stain very deeply, the nuclei appearing as a clearer area in the 

 centre. 



The septal glands are fairly bulky, but those belonging to segment vi do not push 

 back in any marked degree into vii (as, for example, in L. maximiis and L. macquariensis). 



A pair of postpharyngeal bulbs are present, as is the rule in the genus ; these appear to 

 take the place of salivary glands which, as usual, are absent. 



There is no sudden widening of the oesophagus to become the intestine ; there is a 

 slight localized dilatation in segment x, and another in xiv, but it seems doubtful whether 

 these have any importance. 



The dorsal vessel originates in segment xiii. 



The anteseptal portion of the nephridium is small, but nevertheless comprises a little 

 more of the organ than the mere funnel. The duct is given ofT from the hinder end ; it is 

 half as long as the postseptal or sometimes more — almost as long as the postseptal, 

 and passes downwards and somewhat forwards. 



The testes consist of large, typically pear-shaped lobes, containing within the 

 investing membrane male cells, morulae in various stages of development, and ripe 

 spermatozoa. The lobes radiate from their attachment at their narrow ends in a fan-Hke 

 manner (as seen in longitudinal sections), forwards into segment x and backwards into 

 xi ; one large lobe gets into ix and one into xii (in the specimens sectioned). 



The funnels are remarkably short, only ij or I5 times as long as broad at their free 

 end ; in shape they are rather triangular or pear-shaped, becoming very much narrower 

 at their base where they pass into the vas deferens ; there is no projecting flange-like rim. 

 The vas deferens is confined to segment xii, forming a close coil behind septum 1 1/12 ; it 

 is relatively stout, 16/^1 in diameter. The penial body is of the usual lumbriciUine type, 

 roundly ovoid in shape, with a muscular capsule, the longer (antero-posterior) diameter 

 200-240 /x. 



The spermathecal ampulla (Fig. 8) is somewhat spindle-shaped or rather perhaps of 

 an inverted pear shape; its ental end is prolonged to the oesophagus, with which it 

 communicates by a patent passage; spermatozoa are seen to be attached to and to 



