fang. Further P. dai/i has a membranous crest 

 across setiger 7 while P. pugmaea has not. 



In a partial revision of the genus Prionospio 

 to which numerous taxa have been assigned. 

 Dr. Foster has erected a new genus Apopriono- 

 spio to include those species with four pairs 

 of gills starting on setiger 2 and with only the 

 fourth pair pinnate. While it would be most 

 helpful to divide the large genus Priojtospio, 

 I believe that such a narrow division as that 

 suggested would demand the erection of too 

 many genera or subgenera. P. ehlersi Fauvel 

 has four pairs of gills with only the first pair 

 pinnate; P. steoisfrnpi Malmgren (the type 

 species of the genus Prionospio), P. fallnx 

 Soderstrom, and P. Ixicki Soderstrom have four 

 pairs of gills of which the first and the fourth 

 are pinnate; P. plninosa Sars has four pairs 

 with all except the third pair pinnate. P. dayi 

 and the three species allied to it have four 

 pairs with only the fourth pinnate; P. hetcro- 

 branchia Moore has five pairs with the first. 

 fourth, and fifth pinnate. Beyond this there are 

 many species with more pairs of gills. If a 

 subgenus were proposed which included the 

 type species P. steeiistnipi and all others with 

 four pairs of gills starting on setiger 2 and one 

 or more of the gills pinnate it would include 

 many closely related species but it is felt that 

 the genus Apoprio)iospio as presently defined 

 creates too many difficulties. 



Records. — Common off Beaufort in 3-200 m 

 (21,22, *). 



Disti-ibi(tio)i. — North Carolina and the Gulf of 

 Mexico; intertidal to 200 m. 



Prionospio fallax Soderstrom, 1920 



CO Prionospio ni(tl nif/rcni Claparede, 1869: 73, 



pi. 22: Fig.:?. 

 Prionospio fdlld.r Soderstrom, 1920: 235, Fig. 



13.5, 114. 145. 

 Prionospio niainifircni. - Fauvel, 1927: 61, Fig. 



21 a-e. - Day, 1963a: 418; 1967: 492, Fig. 



18.9. a-c. - Hartman, 1969: 159, Fig. 1-4. - 



Day, Field, and Montgomery, 1971: 122. 



K(ni(irl:s. — Foster (1971: 82) has drawn at- 

 tention to the fact that Claparede's original de- 

 scription of /'. inolnif/rcni is so vague and con- 

 tradictory that it is impossible to be certain of 

 the gill arrangement. Thus the .species is in- 



determinate. Nonetheless, the description of 

 P. malnifjrcni given by Fauvel (1927) and later 

 workers agrees perfectly with the original de- 

 scription of P. fallax Soderstrom. Soderstrom 

 also suggested that the two species are identical. 



Rtcords.~On Beaufort in 10-200 m (21, *). 



Distribution. — Atlantic from Sweden to Ma- 

 deira; Mediterranean; South Africa; southern 

 California; 10-200 m. 



Prionospio cristata Foster, 1971 



Prionospio cristata Foster, 1971: 87, Fig. 186- 

 199. 



Records. — Beaufort in sand at 0.5-32 m (22). 

 Distribution. — North Carolina. Gulf of Mexi- 

 co, and the We.st Indies; 0.5-32 m. 



Prionospio sfeensfrupi Malmgren. 1867 



Prio)iospio steenstrnpi. - Fauvel, 1927: 60, Fig. 

 21 f-i. - Hartman, 1965a: 152; 1969: 165, 

 Fig. 1, 2. - Day, 1967: 489, Fig. 18.9. o-r. - 

 Foster, 1971: 84, Fig. 175-185. 



R< cords. — Common off Beaufort in 160-200 m 

 (21,22,*). 



Distrilintion. — North Atlantic from Norway 

 to Greenland and New Brunswick to Florida; 

 Alaska to southern California; Japan; South 

 Africa; intertidal to 1,745 m. 



Microspio pigmentata (Reish, 1959) 



P'ig-ure lOp-t 



Spiopiiancs pi(/inent(ita Reish, 1959: 11, pi. 6: 



Fig. 1-4. 

 Ncrinides pif/nieiitiita. - Hartman, 1961: 92. 

 ^7-''" (Microspio) piijnientatu. - Foster, 1971: 35 



(list only). 



Description. — Body about 10 mm long. Pig- 

 mentation characteristic, including a .square 

 brown patch on prostomium, lateral and ventral 

 marks on peristome, and midventral spots and 

 fainter marks on parapodia of anterior seg- 

 ments (Figure lOp, q). Prostomium rounded 

 anteriorly and extending back as a low ridge 

 to setigei" 2. Four eyes but no occipital tentacle. 

 Setiger 1 small, partly fused to peristome, with- 

 out bi'anchiac but with distinct jiarajx^lial lobes 



74 



