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flat, obtuse, fleshy segments curling inwards over the mouth. 
Colour pinkish. There is a blood vessel on each side of the 
intestine, but I could trace no circulation in the pectinated 
fans, which seemed to be used by the worm to collect the 
grains of sand, &c. The rasp-like collars, surrounding each 
ring, are very curious. 
There is an animal figured by Dalyell, Powers of the 
Creator , &c., Vol. II., PI. xxxv. f. 4, 5, under the name of 
clymene borealis , which may be identical with our species, but 
the peristome is said to consist of 16 to 24 teeth, which are 
figured as simple and recurved, te forming a shallow funnel. 5 ’ 
This Annelid is simple in structure and very sluggish, and 
it bears more resemblance to the Sipunculidce than to the 
higher worms. In the peristome it reminds us of Chirodota 
digitata , Esch. From Orthonia it differs in the rasp-like 
band which surrounds each segment. 
Sabella ventilabrum. Rare, cast up from deep water after 
storms. 
Captain Mitchell of Madras, three slides of Indian Diatom- 
acese, and contents of seers fishes’ stomachs almost entirely 
consisting of Diatomacese. 
Dr. Alcock read a communication on i( Southport Natural 
Serpula triguetra , L. 
S. contortuplicata , L. 
Spinorbis communis , Flem. 
S. lucidus, Mont. 
S. minuta, Mont. 
uncommon on shells. 
Attached to sea-weed, some- 
times abundant. 
Eooles, April 2 , 1865 . 
April 24th, 1865. 
Thomas Alcock, M.D., in the Chair. 
Donations . 
