Five segments formed anteriorly on fission. 

 (Brinkhurst, 1964.) 



Family TUBIFICIDAE. References: 

 Brinkhurst, 1963; Brinkhurst and Jamie- 

 son, 1971. 



Adelodrilus anisosetosiis Cook, 1969. Cape Cod 

 Bay, Mass. Subtidal, 10 to 21 m depth. In 

 coarse sands. (Cook, 1971.) 



Clitellio arenarius (Miiller, 1776). Nova Scotia 

 to Maryland, but probably a cosmopolitan 

 species. Intertidal. In sand and o:ravel, 

 often under stones and rocks. (Moore, 

 190.5; Brinkhurst, 196.5.) 



Clitellio arenicolus (Pierantoni, 1902). North 

 Carolina and Florida. Subtidal, 5 to 130 m 

 depth. (Brinkhurst, 1966.) 



Isochaeta hamata (Moore, 1905). Acushnet 

 River, New Bedford, Mass. Brackish water. 

 Intertidal, under stones. (Moore, 1905.) 



Limnodriloides medioporus Cook, 1969. Massa- 

 chusetts. Subtidal, 7 to 97 m depth. In fine 

 sands and silt. (Cook, 1971.) 



Limnodriius hoffmeisteri Claparede, 1862. 

 Massachusetts to Maryland, but probably 

 cosmopolitan. A predominantly freshwater 

 species sometimes found in brackish water. 

 (Moore, 1905.) 



Monopylephorus irroratus (Veri'ill, 1873). Mas- 

 sachusetts. Brackish water; intertidal 

 freshwater seepagfes, often with decaying 

 vegetable matter. (Moore, 1905; Brink- 

 hurst, 1965.) 



Monopylephorns pannis Ditlevsen, 1904. Mas- 

 sachusetts. Brackish water and marine. 

 Intertidal, beneath stones, to about 7 m 

 depth. (Moore, 1905.) 



Monopylephoiiis nibroniveus Levinsen, 1883. 

 Massachusetts. Brackish water and marine. 

 Intertidal, just beneath surface; often as- 

 sociated with decaying vegetable matter or 

 freshwater seepages. (Moore, 1905.) 



Peloscolex apectinahis Brinkhurst, 1965. Nova 

 Scotia and Massachusetts. Subtidal, to 21 

 m depth. In sand. (Brinkhurst, 1965; 

 Cook, 1971.) 



Peloscolex benedeni (Udekem, 1855). Nova 

 Scotia to Connecticut, probably a cosmopol- 

 itan species. Brackish water and marine. 

 Intertidal, near high water line, to 18 m 



depth. In gravel and sand, often beneath 

 stones in intertidal zone. (Moore, 1905; 

 Brinkhurst, 1965; Cook, 1971.) 



Peloscolex diikei Cook, 1970. North Carolina. 

 Subtidal, 19 to 200 m depth. In sand and 

 shell fragments. (Cook, 1970a.) 



Peloscolex gabriellae Marcus, 1950. Massachu- 

 setts, but probably amphi-American. A 

 very broadly defined and problematical spe- 

 cies of uncertain specific limits; as it is 

 presently defined the species is found from 

 the low water line to abyssal depths, and in 

 brackish water. In sand. (Cook, 1970b.) 



Peloscolex intermedins Cook, 1969. Massachu- 

 setts. Subtidal, 7 to 300 m depth. In very 

 fine sands and silt. (Cook, 1971.) 



Peloscolex verthoides Brinkhurst, 1965. Massa- 

 chusetts. Subtidal, to 42 m depth. In very 

 coarse sand. Also found in brackish water 

 on the west coast. (Cook, 1971.) 



PhallodrilKs coeloprostatiis Cook, 1969. Cape 

 Cod Bay, Mass. Subtidal, to 51 m depth. 

 In sand. Mature individuals have been 

 found in all seasons of the year. (Cook, 

 1971.) 



Phallodrilus monospermathecus (Knollner, 

 1935). Massachusetts, but possibly a cos- 

 mopolitan species. Brackish water. Inter- 

 tidal, in sandy beaches, especially in or near 

 freshwater seepages (personal observa- 

 tions.) 



Phallodrilus obscnrus Cook, 1969. Cape Cod 

 Bay, Mass. Subtidal, to 8.5 m depth. In 

 sand. Mature individuals found in Novem- 

 ber only. (Cook, 1971.) 



Phallodrilus parviatriatiis Cook, 1971. Cape 

 Cod Bay, Mass. Subtidal, to 18 m depth. 

 In sand. Mature individuals found in Jan- 

 uary and June. (Cook, 1971.) 



Smithsonidrilus marinus Brinkhurst, 1966. 

 North Carolina and Florida. Subtidal, to 

 130 m. (Brinkhurst, 1966.) 



Tiibifex longipenis Brinkhurst, 1965. Maine 

 and Massachusetts. Subtidal, 6 to 51 m 

 depth. In sand and coarse sand. In den- 

 sities up to 2300 per square meter. Mature 

 individuals found in August and September 

 only; cocoons probably overwinter and 

 hatch the following spring. (Cook, 1971.) 



Tubifex pseudogaster (Dahl, 1'960) . Nova Scotia 

 to Massachusetts. Brackish water. (Brink- 

 hurst, 1965.) 



19 



