80 Rev. T. Hincks's Supplement to a Catalogue of 



which is placed halfway between each pair of the larger tentor 

 cles and close to one of the smaller. 



[PI. V. figs. 2, 2 a, 2 h.] 



The gonotlieca of L. clausa is borne on a rather long ringed 

 pedicel, which rises from the stem a short distance below the 

 calycle. It is elongate in form, tapering off from the truncate 

 top to the base, the sides presenting a sliglitly sinuated out- 

 line. It contains many gonophorcs, from each of which a 

 medusiform zooid is liberated. The latter may probably un- 

 dergo important changes as it advances to matuiity. At the 

 time of birth two only of the principal tentacles are fully de- 

 veloped, the remaining pair are represented by the bull30us 

 bases. The small intermediate tentacles are destitute of any 

 enlargement at the point of origin ; they spring directly from 

 the circular vessel, close to the lithocyst, which stands out 

 from the inner margin. They are extensile, and when at rest 

 are spirally contracted ; they are slightly clavate in outline, 

 and, as far as I could determine during a brief examination, 

 the extremity is rather thickly covered with thread-cells. 

 The lithocysts include a single spherule; numerous thread- 

 cells dot the surface of the umbrella. 



The polypite of L. clausa is remarkable for its great length ; 

 when expanded, it rises high above the top of the calycle 

 (PI. V. fig. 2), and is a most beautiful object. The latter, tall 

 as it is, is often insufficient for the accommodation of its 

 tenant, and the body has to be bent, as represented in one of 

 the figui-es, or even looped^ to find space enough within. 



Genus Gonothyr^a, Allman. 

 G. gracilis^ iSars. 

 Salcombe Bay, dredged on shell. 



This beautiful species was discovered by Sars at Bergen ; 

 it has also occmTcd on the coast of Connemara. 



Family Lafoeidae. 



Genus Calycella, llincks. 



C fistigiata^ Alder. 



Cornwall, on Aglaophenia tubulifera and Diphasia pt'nnata, 

 from deep water. Also found in Shetland and the Hebrides. 



Family Haleciidae. 

 Genus Halecium, Oken. 

 If. sessile^ Norman. 

 Salcombe Bay, on Antenniilaria and Salicornaria. 



