50 
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Suborder: VALVIFERA. 
Family: MUNNIDAE. 
MUNNA Boeck (1839). 
Munna brevicornis sp. nov. 
Occurrence. 
July to December; sparingly on algae. 
Female. 
17 mm. in length. Body broad, rather battened and oval; length twice 
the breadth. Head broad, its length: breadth ratio equals 1 : 1*5. The an- 
terior margin of the head is straight, deeply notched on each side at inser- 
tion of the antennae. The eyes are large, situated on lateral projections 
of the head. 
The first four pereion segments are subequal in length, the first slightly 
shorter than the others. Thorax wider than the head, each segment to the 
fourth being wider than the one in front. The last three thoracic segments 
are shorter and curve backwards at the sides. The lateral margins are all 
rounded. The pleon is much narrower, somewhat pear-shaped (ob-pyri- 
form), extremity rounded, without denticles but with a few fringing setae. 
