No. 2.] STRUCTURE OF BIMASTOS PALUSTRIS. 49 1 



4. Certain somites in genital region with hypodermal glandular structures 

 in relation with the setae. 



5. Male pores paired on XV on papillae; female pores paired, XIV. 



6. Sperm sacs, two pairs, in XI and XII. 



7. Funnels and testes, two pairs, in X and XI; free. 



8. Prostates, one pair, in XV and XVI; bilobed. 



9. Spermathecae, none. 

 ID. Nephridia paired. 



II. Alimentary canal, complex. Ciliated oesophageal structure (calcifer- 

 ous gland), in several somites between XI and XV. Crop. Gizzard, one, 

 in somites XVII and XVIII. Not constricted by septum, i species B. 

 palustris, n. sp. Eastern Pennsylvania and New Jersey. 



