BRITISH NAKED-EYED MEDUSA. 357 



these spiral threads, numerous tentacula instead of only sixteen, 

 and fimbriated lips, &c. ; these differences being sufficient to con- 

 stitute it a new species. It lived with me more than a month, 

 and during that time I saw no change in its form. 



Goodslrea mimbilis, a new genus established by Dr. T. Strethill 

 Wright, of Edinburgh ; it was found by him in the Frith of Forth 

 in 1858; my specimens were got at Peterhead in 1851.'^ There 

 are some differences between his and mine ; but I believe them to 

 be, in all probability, sexual, and not of sufficient importance to 

 make a new species. The margin is furnished with two long and 

 large tentacles, which can be stretched out to almost any length ; 

 they are hollow for some distance down, and are permeated by a 

 circulating fluid from the lateral canals, t The tentacles are filled 

 with thread cells in bundles, arranged on the outer part in a van- 

 dyked manner,! becoming more confused towards the centre. 

 This arrangement allows of great lengthening and folding. Fig. 8 

 shows some of the thread cells in part of a tentacle ; fig. 9 some 

 singlj'-. In addition to these two long tentacles, some of mine 

 had two shorter ones ; || these were suspended from the two lateral 

 canals. I saw no circulation in them. The margin had from 

 twelve to fourteen ^ wart-like projections between each two of the 

 four divisions; each projection having two curious short spiral 

 tentacles with a blunt and roughened tip, and, in addition to these 

 projections, were two fan-shaped appendages with four or five 

 moniliform objects embedded in them, — no doubt, the otolites. § 

 The sub-umbrella was very transjoarent ; the four lateral canals, 

 where they met at the upper part, formed a short funnel from 

 which the peduncle was suspended ; this is long and narrow, very 

 extensile, and extends considerably below the edge of the um- 

 brella ; it can be much constricted. ^ The tip is bell-shaped, and 

 divided into four lips. — I obtained numerous specimens, and they 

 lived a long time with me ; they were very active, and it was very 



* Plate I, fig. 5, 6. 

 t Plate I, fig. 7. 

 + Plate I, fig. 8. 

 II Plate I, fig. 6. 

 § Plate I, fig. 7. 

 1] Plate I, fig. 10. 



