POND ANIMALS 153 
In the pond formation proper, the fate of the pond early becomes 
evident along the margin. This will be discussed in connection with 
swamps and marshes. The discussion of the areas properly called 
marshes and swamps is the most complex of all our discussions, and will 
be taken up in the chapter on swamps, marshes, and temporary ponds. 
Tables XXVII-XXXIII show animals recorded from the series of 
ponds at the head of Lake Michigan (Stations 32-37). 
TABLE XXVII 
SPONGES 
Pond Numbers 
Name |" | at Gs 
(Renal ees 7 I4 30 52 93 95 
Meyenia(?) crateriformis Pot... | ls es 
Meyenia fluviatilis Auct........ | Re 
Heteromeyenia argyrosperma Pot. = 
Spongilla fragilis Leidy........ ess * 
TABLE XXVIII 
LEECHES 
Pond Numbers 
Name saa = reas = 
I 5¢ 7a TA: || 30) || .52 93 95 
Glossiphonia fusca Castle......... | | 
Dina fervida Verrill. .... 2.22... * pea hha te ee me | 
Erpobdella punctata Leidy........ rae eer lps Pe hae ee * 
Macrobdella decora Say........... | be = - | 
Haemopis grandis Verrill......... | Byes = * 
Placobdella parasitica Say........ | Meera - 
Placobdella rugosa Verrill......... | os * eg * 
Glossiphonia heteroclita Linn...... | - | ie 
Haemopis marmoratis Say........ . | = 
eae | 
TABLE XXIX 
Sphaeridae AND Unionidae 
Pond Numbers 
Name | 5 : = = 
I 5¢ | 7a | 14b | 30 52 93 | 95 
Unionidae— | | | 
Lampsilis luteola Lam......... + | | 
Anodonta grandis Say.......... IP et : : 
Anodonta marginata Say........ ie et SPs ih. a | 
Anodonta grandis footiana Lea... Sa gare ea 
Sphaeridae— ‘ | | | 
Musculium truncatum Lins...... ee ate * * * 
Musculiwm secure Prime........ = ? = | 
Musculium partumeium Say..... = ? | 
