gers 1 and 2. Setae of following segments 

 shorter and more laterally directed. Notosetae 

 as five to seven barred capillaries. Neurosetae 

 as five to seven bidentate hooks from setiger 

 3 onwards. 



Remarks. — The buccal apparatus was re- 

 tracted into a membranous sheath and the 

 structures recorded above were observed after 

 dissection. Many of the branchial filaments were 

 missing but the scars showed that they had been 

 arranged in two multiserial groups on a tongue- 

 shaped lobe as is usual in the genus Pifoniis. 

 The number of filaments was estimated at 30 on 

 each side of the cephalic ridge but Fauvel 

 states that juveniles may have as few as 8-10 

 filaments. The first hook on setiger 3 was much 

 longer than those on subsequent neuropodia, 

 but is otherwise similar to that shown in Fauvel 

 (1927: Fig. 42 k). 



Claparede's Ti'dplidnia eruca is a typical 

 member of the genus Piromis, as shown by the 

 arrangement of the branchial filaments, the dis- 

 tribution of the skin papillae, the sandy dorsal 

 crust, and the bidentate neuropodial hooks. It 

 differs from the type species. Pii-oiiiis (d'okisiik 

 Kinberg, in having only two dorsal and two 

 ventral rows of skin papillae instead of four 

 dorsal and four ventral rows. 



As noted earlier the record of Wells and Gray 

 (1964) is incorrect so that P. i )ii<:a is not known 

 from the United States. However, as shown 

 below, Tropli())ii(i arDiosa Webster is very close. 



Dist)-ihiitinii. — North Atlantic from the Eng- 

 lish Channel to southern France; Mediterra- 

 nean; intertidal to 10 m. 



Piromis eruca websteri New Subspecies 



Troplionia arcnosa Webster, 1879: 245, pi. 7: 

 Fig. 92-97. -(No*') Pironiisaroiosa Kinberg, 

 1867. 



Stijlarididcn arciiosa. - Miner, 1950: 372, pi. 118. 



Rv)t)(u-ks. — Two syntypes of Trophoiiia are- 

 inim Webster were kindly sent to me by Dr. 

 Pettibone of the U.S. National Museum, Wash- 

 ington, D.C. The head of one syntype had been 

 removed but the other syntype, when dissected, 

 proved to have a similar buccal apparatus to 

 that described above for P. o-iicd. The other 

 characters, including the arrangement of the 

 skin papillae and the sandy crust, were also 

 identical. In fact the only difference observed 

 is that the first hook appears in the neuropodium 

 of setiger 4. not 3. This agrees with Webster's 

 original description. This is a small difference 

 from the stem form and possibly further collect- 

 ing may show that the first hooks may appear 

 on either setiger 3 or 4. However it seems best 

 to consider Webster's species distinct. Webster's 

 original name becomes a junior homonym of 

 P. an')ioi<a Kinberg so I have designated it 

 P. eruca iccbstcii. 



Pi)-iin!is riiherti (Hartman 1951), originally 

 described as Scniiodcra ralicrii may be con- 

 specific but since the distribution of the skin 

 papillae and the neuropodial hooks were not 

 de.scribed, the question must be left open. 



Di-'<tribiiti())i. — Virginia, intertidal. 



FAMILY SABELLARIIDAE 



Key to genera and species 



1 Ojjercular lobes with stout dorsal hooks at base of operular 



peduncles; two rows of opercular paleae 



r Opercular lobes without hooks; three rows of paleae. [Middle 

 row of paleae not forming a cone concealing inner row. 

 Three parathoracic segments bearing stout oar-shaped 

 setae iSahvllaria)] 



2 Four parathoracic segments. Outer row of paleae with smooth 



margins (LiigdaDux) 



2' Three parathoracic segments. Outer row of paleae with bi- 

 pinnate lateral projections {Idaiith!/)-siis) 



No N.C. record 

 No N.C. record 



109 



