14 BRITISH COPEPODA. 
N., long. 12° 253’ W.; and at 40 miles off the Skelligs ; 
sparingly also in Kinsale Harbour. | 
This species was described by Mr. Robertson and 
myself (Joc. cit.) as the type of a new genus—Microsetella; 
but on further examination I find no sufficient grounds 
to maintain its separation from Hetonosoma. The 
general habit and appearance of the animal coincide 
entirely with that genus ; but it 1s worthy of note, that, 
while all other members of the genus seem to haunt 
the bed of the sea, this has been found only near the - 
surface, being taken by the tow-net. I have never 
noticed its occurrence amongst dredged material. 
The mouth organs being so extremely minute, I have 
not succeeded in obtaining a satisfactory view of all of 
them. There seems to be a mandible-palp, but I have 
not been able to see it with sufficient distinctness to 
describe or figure it; and the same may be said of 
the maxille. 
Genus 8. Zostmn, Boeck (1872). 
Anterior antennz 6-jointed, very short and stout ; 
posterior 2-branched, accessory branch 2-joited; 
mandible-palp composed of a large basal portion and 
two small branches. First pair of foot-jaws having 
three marginal setiferous digits; second pair small, 
d-jointed, simple, terminating in a few sete. First 
pair of feet having the outer branch composed of 
three, the inner of two joints; both branches of 
