Baker—The Fauna of The Lake Winnebago Region. 123 
very abundant at station 28 in filamentous algae. Tubes of 
Chironomid larvae are very numerous in the sand habitats. Leeches 
are rare, Glossiphonia fusca, stagnalis, and nepheloidea and Dina 
fervida occurring as single individuals. 
Animal Life on Mud Bottom (Table 1). 
Mud bottom areas in shallow water near shore are not common 
in Lake Winnebago, occurring in protected bays and behind bars 
or points. This kind of bottom is found in Miller Bay, behind 
Asylum Point, in marsh portions of Fahney Bay, and in other small 
protected bays south of the mouth of the Fox River, as well as in 
several small beach pools behind the shore line. In parts of Miller 
Bay a marl or marly-clay bottom occurs on which no life was found. 
About the same species of plants are found here as on the sand 
bottom. 
Among mollusks the Naiades are entirely absent from mud bot¬ 
tom in shallow water and but one specimen occurred on this kind 
of bottom in deeper water (5.2 meters). Pisidium is common in 
places. Of the gastropods, which form 78 per cent of the mullusks, 
Valvata includes 17 per cent, Physa sayii 11 per cent, and Planor- 
Ms parvus 17 per cent. The mollusks are fewer in number of 
species on a mud bottom than on any other kind of substratum ex¬ 
cept boulder. Habitat number 32, a stagnant pool behind the 
beach south of Roe Point, contained the largest number of indi¬ 
viduals. Habitat number 42, a small bay on the south side of Long 
Point Island, contained the next largest number per unit area, due 
principally to the presence of filamentous algae. Taken as a whole, 
the mud bottom habitats in shallow water are poor in molluscan 
inhabitants. 
Associated anim.als are 52 per cent more numerous in individuals 
than the mollusks. Three groups make up 68 per cent of the asso¬ 
ciated animal life; Hyalella knickerbockeri 28 per cent, Asellus in- 
termedius 19 per cent, and Chironomid larvae 39 per cent. The 
other eleven groups are poorly represented. Among Ephemerids, 
Caenis, Heptagenia, and Ephemera occur rarely. Of Odonata, 
nymphs of Enallagma, Anax junius, and Tetragoneuria semiaequa 
are represented by a few individuals; Sialis infumata was found 
only in habitat number 36, in a small bay south of Fahney Bay. 
Of Hemiptera, the large Banatra fusca and a Belostoma occurred 
in one habitat, the mouth of a small creek near Eweco Park, south 
