k-n. - Hartman, 1965a: 150; 1969: 155, Fig. 



1, 2. - Day. 1967: 486. Fig. 18.8. a-d. 

 Prioiiospio delta Hartman. 1965a: 46. 

 Mitnispii) cirrifcra. - Foster, 1971: 108. Fig. 



262-275. 



Rcniarkt^. — Foster (1971) has erected a new 

 genus Mhnispio, with P)ioii()spi(i rh'rifem as the 

 type species, which very conveniently includes 

 all s))ecies with four or more pairs of gills none 

 of which are pinnate. While I do not feel that 

 this grouping is worthy of generic status it is 

 most useful as a subgenus. 



/?rcr./-(7.s-.— Off Beaufort in 10 m (22. *). 



Distriliiitidii. — Arctic; Atlantic from Sweden 

 to South Africa and Greenland to South America; 

 Bering Sea to southern California; 10-2,500 m. 



Prionospio (Minuspio) cirrobranchiata 

 Day. 1961 



FiKure lOtr-k 



Piiiiiiiispio ^ ciii-iftnxt. - Hartman, 1951: 84 {inni 



Wiren). 

 Prionospio cirrohycDicliiata Day, 1961: 488, Fig. 



4 a-d; 1967: 488, Fig. IB.s". e-h. 



Dcscriptio)!. — Body up to 20 mm long. Pro- 

 stomium (Figure lOg) flattened, spade-shaped, 

 and square in front with four eyes. About 10-12 

 pairs of smooth cirriform gills starting on 

 setiger 2; all gills about twice length of noto- 

 podial lamellae. Anterior notopodial lamellae 

 (Figure lOh ) tapered and pointed; subsequent 

 ones (Figui'e lOh) shorter and directed laterally. 

 Neuropodial lamellae longer than broad even 

 on posterior feet. No lateral pouches between 

 neuropodia. Hooded hooks in neuropodia from 

 setiger 17-19, numbering 4-5 per foot. Individual 

 hooks (Figure 10k) with a single tooth above 

 main fang. 



Rcnnirks. — Hartman (1951) gives a similar 

 description ofPriojiospio ? cirri/cm from Florida 

 but does not mention the structure of the hooks. 

 Laubier ( 1962) also describes a form from Venice 

 under the name of P. cirrifera with 10-11 pairs 

 of smooth cirriform branchiae but again he 

 does not describe the structure of the hooks. 

 P. cirrifera Wiren has five or six pairs of smooth 

 branchiae, genital pouches between the neuro- 

 podia and hooks with four pairs of teeth above 

 the main fang. 



Records.— on Beaufort in 80-200 m (21. *). 

 Distribution. — North Carolina to the Gulf of 

 Mexico; South Africa; intertidal to 300 m. 



Prionospio heterobranchia Moore. 1907 



Prionospio Jieterohrancliia Moore. 1907: 195, 

 pi. 15: Fig. 1-6. - Foster. 1971: 90. Fig. 199- 

 212. 



Prionospio lieterolimnehia te.raiia. - Hartman, 

 1951: 85. 



Reco)-ds. — Cape Hatteras area, intertidal (18). 

 Distribution. — Massachusetts to the West In- 

 dies and the Gulf of Mexico; intertidal to 10 m. 



Prionospio dayi (Foster, 1969) 



Kitruii.' li)i-o 



Apoprionospio dayi Foster, 1969: 383, Fig. 

 1-11; 1971: 97, Fig. 226-2.36. 



Description. — Body up to 30 mm long. Pro- 

 stomium (Figure 101) square in front with four 

 eyes. Setiger- 1 reduced and fused to peristome. 

 Four pairs of branchiae on setigers 2 to 5; first 

 pair small, smooth and cirriform; second and 

 third pairs broad, smooth and compressed; 

 fourth pair (Figure lOn) largest with a double 

 series of papillae on inner margin. Notopodial 

 lamellae pointed and medial to notosetae; fourth 

 lamella largest, subsequent ones low and oval. 

 A membranous crest across setiger 7. Neuro- 

 podial lamellae prominent and rounded, that of 

 setiger 2 particularly enlarged. Posterior feet 

 (Figure lOo) with similar postsetal lamellae in 

 both rami. No genital pockets between neuro- 

 podia. Hooded hooks in neuropodia from setiger 

 16-18 with 8-10 per foot. Notopodial hooded 

 hooks from about setiger 40. Individual hooks 

 (Figure 10m) with three pairs of denticles above 

 main fang. Pygidium with three anal cirri, median 

 one long and lateral ones short. 



Reniarks. — Foster (1969: 388) has discussed 

 the affinities of this species and has given a 

 key which neatly separates P. dai/i from P. 

 jii/f/niaea Hartman, P. satdanlia Day, and P. 

 easpersi Laubier. 



P. dai/i and P. pi/gniaea both have multi- 

 dentate hooded hooks while P. sakhniha and 

 P. easpersi have a single tooth above the main 



73 



