170 



BULLETIISI ()K THE BUREAU OF FISHERIES. 



close to the body floor, forms in XI a sinuous loop or two leading dorsad by the side of the intestine 

 and expands into a fusiform receptaculum, the anterior end of which bears a prominent prostate 

 gland usually drawn out into two slendpr lohes. A short ductus leads to the atrium which is 

 cylindrical and about three tinus :i- hiiu :i- tliirk. From the ventral body wall the atrium rises to 

 the side of the intestine. Penis -lii.tiL -iiii|ili'. smooth, and chitinous; the penis in retracted condi- 

 tion apparently about 5 or 6 times its diuuiuiuf and of uniform thickness. Paired external pores in 

 line with spermathecal pores and smaller than they. 



The septum X/XI is produced caudal through XI as a single median (or perhaps a pair of closely 

 approximated), sjierm sac havins tlic form of a narrow tube, into which the lateral vascular arches 

 of X enter. The s(|ituiii X I XII is >iiiLilarly pushed back into a certainl)- unpaired tubular ovisac, into 

 which both the sin-i m smi- an.l tlir \as(iilar arches enter, the latter much looped and folded. In the 

 specimens sectioned the cuiiiljinc-d spenn and ova sacs reach only to the posterior end of XII, and 

 while the former is crowded with spermatozoa the latter contains no ova. Similarly to the testes, the 

 ovaries are attached to the posterior face of septum X/XI just laterad of the point of passage of the 

 vas deferens. They are much longer than the testes and loop across the upper part of the body cavity 

 several times. The interior of the egg strings is a granular mass with little or no trace of cell bound- 

 aries or nuclei and appears to be formed of disintegrated ova. Whether or not these egg strings are 

 entirelv free from the ovaries is uncertain. 



XI XII 



hG. 6.— Diagram of the principal reproductive organs contained in tlie tenth, eleventli, and twelfth somites of Linmo- 

 drilus gracilis, as seen from the side; (, testes; sp, spermatheca; /, sperm funnel; v, v, vas deferens; p, prostate gland; 

 r, receptaculum seminies; at, atrium containing penis and penis sheath and opening externally at cf ; or, ovary, largely 

 cut away, only the base remaining; ss, sperm sac; and os, ovisac, both represented as continued beyond somite XII. 



Brain about as broad as long, with thick masses of ganglion cells and very shallow anterior and 

 posterior emarginations. Vascular arches of the first seven somites very long, branched, and complexly 

 folded, forming a conspicuous system of integumental vessels. Large hearts in VIII and IX. 

 Chlarogogue cells begin in VIII. 



This species was found at several stations (4.31n, 432a, 477a) among reeds about the shore of 

 Rondeau Harbor, Ontario, during the latter part of August, 1899, and at Norwood, Mich., was 

 dredged in 13 fathoms on August 8, 1894. The former is the type locality, and the type specimen is 

 no. 5227, U. S. National Museum. 



GLOSSOSCOLECII).^. 

 Sparganophilus eiseni Smith. 



Sparganopiiihts eiseni Smith. Bulletin Illinois State Laboratory of Natural History, vol. iv, 1S95. p. 142. 



This species was found at Lake St. Clair August, 1894, 2 small specimens taken on the bottom 

 with the Birge net; bank of Round Lake, Charlevoix, Mich., July 20, 1894, two immature specimens; 

 High Island Harbor, Beaver Islands, Michigan, trawled in Chara, 1 large example; Squaw Bay, Put in 



