152 ZOOPHYTES. 



The specimens affording this description were obtained in two fathoms 

 water, off Santa Cruz. Smaller specimens were seen in sandy pools 

 left by the tide among the rocks, on the north side of the harbour near 

 Praya Grande. When molested, they conceal themselves entirely 

 beneath the sand. 



While kept confined, the form was constantly varying ; at one 

 moment, becoming a flat disk, and the next extended to a length of 

 six inches. It moved about upon the sides of the glass with consider- 

 able ease, by means of its exterior tentacular fringe, crawling up the 

 sides of the jar, a length of sixteen inches, in about five hours. No 

 stinging sensation was perceptible while handling it; but when the 

 disk was touched to the tongue or lips, it was very apparent, and the 

 irritation lasted from twenty minutes to an hour. 



Another allied species was observed by Dr. Pickering in the sand 

 among the rocks outside of the harbour. J. P. COUTHOUY. 



METRIDIUM CONCINNATUM. (Dray ton.} 



M. depressum, medio 2" crassum, infra supraque' dilatatum, disco 3" 

 lato, valde radiato, margine plicato-lobato ; lateribus tuberculosis, tuber- 

 culis suctoriis ; tentaculis internis subulatis, validis, sparsis, J" longis, 

 canaliculatis, et fere triangulatis ; fimbrio-tentaculis externis,fere %" 

 longis et l-l"' latis, frondescenter laciniatis. 



Depressed, 2 inches in diameter at middle ; upper and lower extremi- 

 ties dilated ; disk 3 inches broad, strongly radiate, margin plicato- 

 lobate; sides tuberculous, tubercles suctorial; inner tentacles half 

 an inch long, stout, subulate, scattered, channelled and almost tri- 

 angular ; fringe-tentacles external, nearly J an inch long, and 1 to 

 1J lines broad, frondescently laciniate. 



Plate 5, fig. 40, animal natural size ; a, one of the tentacles ; b, a 

 transverse section of the same. 41. The animal as it occurs half- 

 concealed in the sand. 



San Lorenzo, Callao, Peru. Ezp. Exp. 



The ground colour of the body is ochreous-olive, while the vesicles 

 are olive-green. The inner tentacles have nearly the colour of the 

 body, though paler, and are faintly striped with pale purple. The 



