320 INVERTEBRATA OF MASSACHUSETTS. 



tryllus. In the bathing-house at Craigie's Bridge, I have seen 

 one species of the latter genus, in abundance. I suppose it 

 to be 



BotRy'lLUS STELLA^TUS, Pallas; Spicil. Zool. x. 37, pi. 4, f. 1-5- 

 Encijc. Mttli., No. 1. Lam. ; J]n. sans J'ert., iii. 50G. 



It forms over the timbers and sea-weed a semi-transparent, ge- 

 latinous crust, studded at short intervals with minute stars. Each 

 ray of these stars is a separate animal, with its head at the circum- 

 ference and its tail descending into the jelly at the centre. 



