336 OBSERVATIONS ON THE CHLORAEMIDAE, 



A remarkable feature is the arrangement of the papilla?. Those 

 of the first two segments are elongated, especially round the bases 

 of the fasciculi of setae. On the dorsal surface of the body each 

 papilla is elevated on a conical wart-like protuberance, while on 

 the ventral surface these elevations are absent. They are more 

 numerous than in the preceding species, smaller and with a 

 tendency to form transverse rows only on the dorsal surface. 



I am not quite clear as to the position of this species ; but if 

 Grube's definitions of the genera Trophonia and Stylarioides be 

 followed, the retractile praestomium would place it in the latter 

 ^enus. At the same time, the considerable development of the 

 setae behind the head brings it nearer the species of Trophonia. 

 It has considerable resemblance to the European T. plumosa, 

 Miiller ; but the tubercles on that species are described as being 

 found all over the body instead of being confined to the dorsal 

 surface. 



IV. — Integument and papilla. 



In Goppingeria the cuticle, which is of considerable thickness 

 over all parts except the branchiae, is covered superficially with a 

 layer of a granular-looking substance with included irregular 

 particles, which is evidently the layer of mucus with entangled 

 granules of foreign matter present in other members of this 

 family. This layer, however, though represented in all parts 

 except the prae- and peristomium, with the branchiae and ten- 

 tacles, is comparatively thin, being for the most part of about the 

 same thickness as the cuticle. A similar layer of tough gela- 

 tinous matter has been noticed by all who have given attention 

 to the structure of this family of Polychaeta. In Siphonostomum 

 it is separable with a little trouble from the body of the worm ; 

 but in the present form, as in Stylarioides, it is firmly adherent, 

 so as to appear as a definite layer of the integument. 



In Coppingeria the cuticle has the appearance of consisting of 

 a single layer. But in Stylarioides ductus (PI. xxvu. fig. 15) there 

 are two, the more internal having many papillae and ridges, which 

 penetrate into the outer. 



