MICHIGAN ACADEMY OF SCIENCE. 83 



widel.y distiibuted Sparganophilus eiseril, the species represented 

 tire all Lintihrloidae. 



Sparc/a no phihis eiseni Smith. Abundant in the mud of the bottom 

 and mar<iius of beach pools and the less exposed shores of the lake. 



Helodrlhi.'i tetraedrus (Savigny). A few specimens of the typi- 

 cal form of this species were found at the mar<>in of a pool near the 

 north shore of Burt Lake. 



Helndrilus foetidvs (Savigny.) In rotten logs near the west 

 shore of Douglas Lake. 



Helodriliis caliginosus trapezoides (Dug^s). Fairly common in 

 the soil of the hardwood forest area on the west side of Lancaster 

 T>ake and in the "Gorge." 



Helodrilus tenuis (Eisen). Common under the bark of rotting 

 logs near the shores of Douglas Lake. Numerous specimens were 

 found in an obi heap of decaying horse manure mingled with saw- 

 <lust, near an old lumber mill site at the north end of Burt Lake. 

 Various conditions in the development of spermathecae were found 

 in the sectioned specimens. In other respects the specimens were 

 similar to those of H. tenuis. The relations of these worms are ob- 

 scure and their discussion is left for a later ])aper. 



Helodrilus parvu^s (Eisen). Under logs on the shore at the west 

 end of Douglas Lake. 



Helodrilus heddardi (Michaelsenj. In moss on shore of brook in 

 the "Gorge." 



Helodrilus zetehi ir?mith and Gittins. Fairly common in decay- 

 ing logs of the hardwood forest areas near Douglas Lake. 



Lumbrious ruhellus Hoflfmeister. Under debris along the shore of 

 Douglas Lake near Ingleside and Bryant's. 



The EnclDjtraeidae of the region are receiving attention from Dr. 

 Welch who has already described two species : Fredericia douglasen- 

 sis Welch and Henlea tuhulifera \A^elch. 



The only species of the L'wmhricuUdiie that is represented in 

 our collections is Lunihriculus hiconstans (Smith) which is abund- 

 dant in the detritus of the bottom and margins of beach pools and 

 the less exposed shores of the lake. 



Very few Tuhlpcidae were collected and as they are mostly im- 

 mature, no complete identifications have been made. Tuhifex and 

 lAmnodriliis are both represented. 



No special study was made of the NaiMdae but the following 

 species were noticed. 



Chaetofjaster dinplianns Gruitliuisen. Common in masses of 

 algae. 



