332 



Fig. 4. A cell with the polype retracted. 



a. a, a. The polype cell. 



b. The orifice of the cell. 



c. c. The inverted membrane, which, in the completely re- 

 tracted condition of the polype, consists of that portion of the 

 internal membrane which had been carried out in the act of exser- 

 tion, together with the more flexible termination of the external 

 tunic of the cell. 



d. The stomach of the polype. 



e. The rectum. 



J^. The oesophagus. Both rectum and oesophagus are here 

 curved upon themselves, and thus accommodated to the retracted 

 state of the polype. 



ff,ff. The crown of tentacula retracted, and the tentacula 

 approximated into a close fasciculus. 



h, h. The proper retractor muscles of the polype in a state 

 of contraction. 



i, i, i. The opercular muscles also contracted. 

 k, k, k, k. The parietal muscles relaxed, 



Dr. Robinson gave a brief account of meteors observed 

 at Armagh on the 10th of August, 1842, apologizing for the 

 imperfect nature of the observations, while he felt that it 

 was desirable that they should be placed on record. 



The sky had been overcast, but became clear a little after 

 ten, of which Dr. R. was availing himself to try an eye- 

 piece of a peculiar construction, when the appearance of two 

 large meteors, travelling in nearly the same direction, re- 

 minded him of the peculiar character of the 10th, and in 

 conjunction with T. F. Bergin, Esq. and another observer, 

 he proposed to watch for others. The roof of the dwelling- 

 house afforded an excellent position. Mr. Bergin looked 

 south-west; he (Dr. R.) east; and the third north. From 

 lO'^.SS'". Armagh time, till 12'', seventy-eight were seen ; of 

 which about twenty were in Dr. Robinson's district, and fifty 

 in Mr. Bergin's. With scarcely any exception, their ten- 



