250 MICHIGAN SURVEY; 1908. 



The specimen is too small to show the peculiar branching habit very 

 distinctly." 



A large quantity of this sponge was also secured during 1904 in the 

 Porcupine Mountains, Ontonagon county, Mich., by N. F. Macduff. The 

 specimens came from Carp Creek (Sta. VI) in August. Concerning these 

 specimens Prof. Harvey also remarks: "Skeleton spicules smooth, 

 slightly curved, pointed at both ends. Dermal spicules half the length 

 of skeleton spicules, or shorter, spinous spines numerous but short. 

 Gemmules not well developed. The branches containing few or none. 

 The encrusting portion of the sponge manifesting some. Gemmule 

 spicules wanting. The gemmule crust very thin, or altogether wanting. 

 Its branching character is well marked, and the small size of the 

 branches indicate the weak form which seldom shows many gemmules 

 or in which the gemmule spicules are seldom well developed. In con- 

 sequence of the size and striking branched habit of this sponge it is the 

 one that is usually first found by collectors. I am surprised to find any 

 gemmules matured in these sponges at the season when these were col- 

 lected." 



NEMATODA. 



Gordiidae. 



Oordiiis aqu-aticiis rohustus (Iveidy) Montg. Hair Worm. This species 

 of hair worm was fairly abundant : specimens were taken at the head 

 of Tobin Harbor (IV, 7) among Potamogeton perfoKatmn on July 20: 

 among sedges at the head of a small island in the Harbor (IV, 6), and 

 on the beach at our camp on Siskowit Bay (V, 1) August 3 and 6. Both 

 sexes are represented in our series, cf. Jlontgomery, '98, pp. 30-31. 



jGeographic Range. Bay of Fundy ; Maine ; Massachusetts ; Maryland ; 

 District of Columbia; New York; Pennsylvania; Montana; Michigan; 

 Kansas. The typical form occurs in Europe. 



During August, 1903, Mr. A. G. Euthven secured specimens of Gordiua 

 lineatus Leidy, in a spring in the Porcupine Mountains (Station VI),. 

 Ontonagon county, Jlich. cf. Montgomery, '98, p. 32. This species seems 

 to frequent springs. It is recorded from New York, Pennsylvania and 

 Maryland. 



REFERENCES. 



i898. Montgomery, Jr., T. H. The Gordiacea of Certain American 

 Collections with Particular Keference to the North American Fauna. 

 Bull. Mus. Comp. Zool., 32, pp. 23-59. 



1899. Gordiacea (Hair worms). Amer. Nat., 33, pp. C47-652. 



I-IIRUDINEA. 



Olossiphonidae. 



GlossipJionia coniplamila (Linn.). One specimen of this leech was 

 taken in a tamarack swamp {\, 5) on August 12. Moore ('01, p. 493) 

 states that it abounds under stones in running water and "feeds chiefly 

 on small snails and annelids." 



Geographic Range. Connecticut; Lake Ontario; Lake Erie; Ontqrio; 

 Ohio; Michigan; Illinois; also found in Eiu'ope. 



