MUSSEL PAUITA OF MADMEE RIVER. 



23 



restlessness caused by the warmth of the shallow water and that? their 

 action of deeply burying themselves was in anticipation of the dry- 

 ing up of the reservoir. A number of the Anodontas obtained at this 

 time were examined as to food and parasites, with the following 

 results : 



No. 1. — Parasites : Atax, 3, in gill axils ; Cotplaspis msiffnis, 1, in axil of inner 

 gills; Aspidogaster conchicola, 2, in pericardial cavity. A small patch of PIu- 

 matella polymorpha on each valve. Gills empty, but ova in the body. Stomach 

 contents ample, brownish green in mass, containing a few Sceneclesmus and 

 numerous globular organisms, probably Trachelemonas. 



No. 2. — Parasites : Ataof, 27, in axils of gills ; Gotylaspis insignis, 8, in axils 

 of inner gills; Aspidogaster conchicola, 8, in pericardial cavity. Shell deeply 

 stained a salmon color on the inside, with a tadpole-shaped blister on the left 

 valve near the siphonal opening. Considerable Plumatella polymorpha on the 

 outside of the valve. Stomach contents fine greenish brown in mass, mostly of 

 unrecognizable material, and containing several Scenedesnms, 1 Pediastrum 

 pertusum, and 1 shell of rotifer Amirwa cochlearis. 



No. 3. — Parasites : Ataw, 43, between and among the gills, chiefly in the axils ; 

 Gotylaspis insignis, 2, axils of inner gills; Distomum of Osborn about 248, on 

 outside of mantle, between mantle and shell; Aspidogaster conchicola, 8, in 

 pericardial cavity; Sporocysts (Distomum of Osborn) innumerable, distributed 

 thickly throughout the mantle. Stomach contents, chiefly minute green and 

 black globules, probably Gryptomonas, and 1 diatom, Pleurosigma. 



No. 4. — Parasites: Ata(ff, 8 large, 2 small, in gill axils. The large ones were 

 full of eggs. DistomAim of Osborn, 58, 30 on the right side near the umbo 

 (" right shoulder") and 28 on the left; Gotylaspis insignis, 9, in axils of inner 

 gills; Aspidogaster conchicola, 2, in pericardial cavity. Stomach and intestine 

 almost empty, but contained Trachelemonas, Oamosphwria aponia, and a 

 spindle-shaped Euglena-like organism. Nacre stained a deep salmon color, with 

 a good deal of Plumatella on the outside. 



No. 5. — Parasites : Distomum of Osborn, 33 on the " left shoulder " and 35 

 on the right; sporocysts of that species innumerable throughout the mantle, 

 the cercarise escaping from them and present in large numbers ; Ataw ypsilo- 

 phorus 32 ; Atax, small species, 18, between gills ; Gotylaspis insignis 11, in axils 

 of inner gills; Aspidogaster conchicola, 5, in pericardial cavity. The intestine 

 contained numerous minute dark-green globules {Trachelemonas?) , which 

 were moving about actively. It also contained the Euglena-like organism, and 

 Anurwa cochlearis, 1 empty shell. 



No. 6. — Parasites : Distomum of Osborn, 23 on the " right shoulder " and 

 12 in the left; Atax 50, in the axils of the gills; there were many Atax eggs, 

 which are minute yellow objects, on the inner side of the mantle. Two species 

 of Atax present, a large and a small, both full of eggs. The eggs in the mantle 

 were hatching, and the larvfe were present in the different stages of develop- 

 ment; Gotylaspis insignis 4, in the axils of inner gills, and Aspidogaster 

 conchicola 13, in the pericardial cavity. The shell had considerable Plumatella 

 polymorpha attached; the nacre was stained a deep salmon, and there was 

 a raised ridge on the right valve from the umbo downward and backward. 



No. 7. — Parasites : Atax intermedins 14, in axils of gills, and with the eggs 

 scattered on the inside surface of the mantle ; Distomum of Osborn about 100, 

 on the " shoulders " ; Gotylaspis insignis 9, in the axils of the inner gills ; 

 Aspidogaster conchicola, 2, in pericardial cavity. The alimentary canal of this 

 example was empty. Interior of the shell with a row of four salmon-colored 



