BY WILLIAM A. HASWELL, M.A., B.SC. 743 



apex. The neuropoclium contains ten to fifteen compound setfe 

 similar to those of S. nigroimnctata (vide infra), but more slender 

 and wilh the terminal part much nan-ower in proportion, and 

 three to five acicula. The ventral cirri are short and unjointed, 

 scarcely projecting beyond the ends of the parapodia. 



The dorsal cirri are very long, six times the length of the para- 

 podia ; as long as, or a little longer than, the breadth of the body, 

 with about 35 to 40 very distinct and regular joints. 



The oesophagus is long, extending back as far as the fifteenth 

 segment. There is a circlet of about thirty papillae and a conical 

 yellow tooth. The gizzard is long and narrow, extending over 

 eight segments. The glandular part of the alimentary canal is 

 short, extending through two segments, and has two pairs of 

 cfeca, the anterior pair the larger and slightly branched. 



This species is to be distinguished from S. erythro'psis, Grube 

 (" Annulata Semperiana," p. 121), to which it shows some points 

 of resemblance, by the presence of the acicula and the greater 

 number of setse in the parapodia. From S. vittata Grube [S. 

 aurita Claparede, teste Marenzeller), it is distinguished by the form 

 of the setae and the absence of the transverse violet lines. 



The bases of the dorsal cirri are full of rounded bodies which 

 are readily discharged by rupture. 



The wall of the gizzard presents some 40 transverse rows of 

 radiating muscle-columns, which, on a superficial view, shew a 

 granular interior with reddish nuclei. Each of these columns has 

 a square outer end where it fits in with its neighbours to produce 

 the curious mosaic-like appearance presented by the wall of this 

 part of the alimentary tube. The centre of the outer part of each 

 column is occupied by a little clump of very granular protoplasm 

 containing the reddish nuclei referred to above. The transverse 

 striations are few (only some five or six in each muscle-cylinder) 

 but very well marked. 



The epithelium of the intestine in its whole length contains large 

 numbers of greenish concretions similar to those found in the caeca 

 of Polynoe, the nephridia of Serpula, and the paired glands of 



