PHYLLODOCIDAE 113 



fused with the head and devoid of bristles. The first few chaetigers carry simple bristles 

 with hooked ends, the remainder carry compound bristles and usually a few simple 

 bristles. The pedal lobe is rounded and the dorsal and ventral cirri are foliaceous. 



First two chaetigers very much larger than the rest and carrying a number of stout hooks 

 surrounded by a sinuous collar ... ... ... ... • • • ■ ■ • • • • ^- uncinatus 



First two chaetigers slightly larger than the rest and carrying small hooks and no collar 



L. krohnii, var. simplex 



Lopadorhynchus krohnii (Claparede), var simplex, Monro. 

 Monro, 1930, p. 79, fig. 23 a, b. 



Occurrence. St. 702 (i). 



Varietal characters. Up to about lo mm. in length. In the younger specimens 

 eyes are not visible, but in adults a pair is present as in the stem-form. The first two 

 chaetigers have rather stout, cylindrical pedal lobes, about half a dozen simple bristles 

 with hook-like ends, and no ventral cirri. The pedal lobes of the remaining chaetigers 

 are flatter and have oval dorsal and ventral cirri. The bristles are arranged fan-wise and 

 consist of paddle-shaped compound chaetae with oval blades denticulated on one edge. 

 There are no simple hooks behind the second chaetiger. The absence of simple hooks 

 from all chaetigers except the first two is the only substantial difference between the 

 variety and the stem-form. The latter is described by Fauvel (1923, p. 185, fig. 68 a-d) 

 and by Bergstrom (1914, p. 180, fig. 68 a, b). The present specimen is a young one, 

 measuring only 5 mm. by i mm. without the feet for 20 chaetigers. 



Lopadorhynchus uncinatus, Fauvel. 

 Fauvel, 1923, p. 184, fig. 67 a-g. 

 Occurrence. St. 714 (i). 



Specific characters. The specimen measures 18 mm. by 2 mm. without the feet 

 for 32 chaetigers. The head is broader than long and there are four tentacles. There are 

 two pairs of tentacular cirri reaching back to the 2nd chaetiger and a third rudimentary 

 pair situated at the base of the second pair. There is a pair of large eyes. The first two 

 pairs of feet are very much larger than the rest, being very stout and rounded in section. 

 They carry a number of large dark brown hooks which are surrounded by a delicate 

 sinuous membrane. There is a small dorsal cirrus, but the ventral cirrus is absent. 

 These first two chaetigers are clearly separated by a constriction from the rest of the 

 body. The normal feet point backwards and consist of a lanceolate pedal lobe with a 

 projecting aciculum, a large rounded vertical lamella, a stout, lanceolate dorsal cirrus 

 and a conical ventral cirrus. The bristles have a fan-shaped arrangement and are all 

 compound except in the 3rd chaetiger which has in addition a few simple bristles. The 

 shafts end in a point, below which there is a kind of notch with which the broad paddle- 

 shaped blade is articulated. This blade has a few delicate denticulations on one edge. 



Remarks. This specimen agrees in detail with Fauvel 's description. I believe this to 

 be the first record of this species from the South Atlantic. 



