P0LYCH2ETA OF THE L.M.B.C. DISTRICT. 257 



plumosa, indeed it is fairly common at low water at Puffin 

 Island. After careful examination of specimens of the 

 undoubted S. diplochaitos obtained from the Naples Zoo- 

 logical Station and home specimens of Flabelligera affinis, 

 Sars, I cannot but conclude that specifically they are 

 identical. The slight differences there are, are amply 

 accounted for by the varying states of contraction con- 

 sequent upon divergent preservative agents and to the 

 considerable difference in latitude between the two 

 habitats. Quatrefages could certainly never have seen a 

 specimen of the Naples S. diplochaitos else he would not 

 have defined the genus Siphonostoma as destitute of hairs 

 or glandular papillae. 



Family. — Terebellid^e. 



*A mphitrite Jig id us, (Dalyell) . 



Hab : Puffin Island and Egremont. 



The A. Jolinstoni of Malmgren according to Marenzeller. 

 The presence of 24 pairs of notopodial fascicles of capill- 

 ary setae is characteristic of this species. Tube of mud, 

 the corrugated end projecting about an inch above the 

 surface of the mud-flat where it is found. 



Terebella nebulosa, Montagu. 



Dredged off Port Erin. 



Lanice conckilega, (Pallas). 



Abundant on the littoral, and taken frequently in the 

 dredge. 



Thelepus cincinnatus, (Fabr.) 



Hab : 4, 8, 10, 13, 14, P. Littoral to 22 fins. 



Shares with Lanice conckilega the honour of being the 

 characteristic species of Terebellidae of this district. It 

 however has not so high a littoral range as the latter, but, 

 on the other hand, it is, of the two, much the more 

 frequently found in deep water. 



Since Malmgren' s time the name has continually been 



