168 



BUL' ETIN OF THE BUKPJAII OF FISHERIES. 



stolonization, and the budding zone is situated with remarkable constancy at XXXIV. No sexually 

 mature examples were found, but the large buds of some from Lake St. Clair appear to be nearing that 

 condition, and at least one has genital setts distinctly 

 developed on V. 



This species was taken at New Baltimore on August 

 8, 1893, among weeds, at Round Lake July 16, 1894, on 

 the bottom, Burt Lake (9), Mullet Lake (13), and at an 

 unknown station in Lake St. Clair. It occurred at San- 

 dufiky on August 4, 1899, and very abundantly at the boat 

 landing at Erie, Pa., with S. lacustrU on August 16, 1899. 



Schmardaella filiformis (Schmarda) Michaelsen ?. 



Schmardaetla flliformis, Beddard, Ergebnisse der Hamburger Magel- 

 haensischen Sammelreise, Naididse, p. 5, 1896. 



The most important result yielded by this collection 

 of Oligochseta is the addition of Schmardaella to the 

 North American fauna. Whether or not the few im- 

 perfect specimens represent a new species is uncertain, 

 and though it seems probable that this will eventually 

 prove to be the case our knowledge of both the type 

 and this species is so very incomplete that a definite 

 opinion can not be ventured, and it seems test for the 

 present to record the specimens with this explanation 

 under the above name. S. filiformis, the type and only 

 and Chile, and was descrited by Schmarda and later 



FIG.3.— Sfytaria/ossMfaris, dorsal view of anteriorseven 

 somites, showing form of prostomlum, brain, etc. 



in Ecuadi 



known species, has been foun 

 by Beddard. 



The 3 specimens in this collection, which have neither buds nor sexual organs, were all taken 

 among Chara stems dredged at New Baltimore on August 20, 1893. They vary from 5.3 mm. to 

 6.5 mm. in length and have from 46 to 52 segments. The prostomium is prominent 

 and rounded; the anterior 2 or 3 somites somewhat enlarged. Dorsal set<e are 

 totally absent, the ventral on all somites considerably enlarged, their length equal- 

 ing two-thirds or more of the body diameter (fig. 4). In the largest specimen 

 many of the fascicles of the middle region contain 3 setie, the majority having but 

 2, while in the smaller ones very few have 3. All are strongly /-shaped, with a 

 small but distinct nodulus a little beyond the middle, the tip strongly hooked and 

 bifid, with the 2 prongs strongly divergent, of equal length, and the terminal one 

 half as thick as the accessory. On the first 3 or 4 somites the setse are more slen- 

 der, though, owing to the variability of the latter, this may have little significance. 

 The ventral lip of the anus is slightly longer than the dorsal, and bears a pair of 

 small papillfe. Notwithstanding the absence of the dorsal setse Schmardaella is 

 clearly not closely related to Chictogasler. So far as it can be made out the alimen- 

 tary canal is much like that of Nais. The brain seems to approach the form of 

 Dero limosa, but is narrower. Schmarda figures a worm of 15 segments, and shows 

 3 setfB per fascicle, while Beddard states that there are but 2. Nothing whatever 

 is known of the genital organs. 



Fig. 4. — SchmardacUa 

 filiSormis, a fascicle 

 of three setae from 

 middle of body. 



Chsetogaster diaphanus (Oruithuisen) Oersted. 

 Chsetogaaler diaphanus, Vejdovsky, System u. Morphologie der Oligochaeten, p. 37, 1884. 



Many specimens of this beautiful annelid in a state of active bud formation are found in both 

 the Lake St. Clair and Lake Erie collections. Lake St. Clair, August 19 and 22, 1893, bottom, among 

 algse, several; Round Lake, July 16, 1894, several; Lake Erie (38a) July 7, 1899, many; East Harbor, 

 Sundusky, Ohio (182n), August 4, 1899, 2 specimens; Sandusky, Ohio, August 4, 1899 (212a), 1 

 specimen. 



