194 U.S. NATIONAL MUSEUM BULLETIN 2 27 



Key to the New England Species of Nephtys 



1. Tentacular segment with enlarged neuropodial lobe lateral to the setigerous 



lobe, with a large ventral tentacular cirrus; without dorsal tentacular 



cirri (figs. 49,c,c?, and 50a,c 2 



Tentacular segment without especially enlarged neuropodial lobe; with 

 dorsal and ventral tentacular cirri subequal (fig. 49a) or dorsal pair smaller 

 than ventral pair (may be reduced to a tubercle) 4 



2. With overlapping dorsal lamellae above the notopodia, flat over the dorsum 



(fig. 47e) N. squamosa (p. 194) 



Without overlapping dorsal lamellae above notopodia 3 



3. Ventral tentacular cirri anterolateral, anterior to widest part of enlarged 



tentacular segment (fig. 50c). Dorsal or branchial cirrus without enlarged 



lobe at base (fig. 50c/) N. picta (p. 195) 



Ventral tentacular cirri lateral and continuous with widest part of enlarged 

 tentacular segment (fig. 50a). Dorsal or branchial cirrus with enlarged 

 lobe at base (fig. 506) N. bucera (p. 196) 



4. Both anterior and posterior parapodial lamellae about equally well developed, 



enclosing the conical acicular lobes (fig. 51a) N. incisa (p. 198) 



At least anterior parapodial lamellae rudimentary 5 



5. Branchiae wide, foliaceous (fig. 47d). Posterior parapodial lamellae shorter 



than the acicular lobes N. paradoxa (p. 200) 



Branchiae cirriform, may be inflated basally. Posterior parapodial lamellae 

 as long as or longer than the acicular lobes 6 



6. Posterior parapodial lamellae rather short, about same length or only slightly 



surpassing the acicular lobes (fig. 51c) N. ciliata (p. 202) 



Posterior parapodial lamellae longer 7 



7. Branchiae inflated basally (fig. 51e), rudimentary or absent on posterior half 



of body. Both notopodial and neuropodial posterior lamellae, short, 



inconspicuous in posterior region of body (fig. 51/). . N. discors (p. 203) 



Branchiae cirriform, continuing to near posterior end. Posterior lamellae 



better developed in posterior region 8 



8. Both notopodial and neuropodial posterior lamellae large, foliaceous through- 



out length of body (fig. 516) N. caeca (p. 203) 



Notopodial posterior lamellae of middle and posterior region of same length 

 or extend only slightly beyond acicular lobes, neuropodial posterior lamellae 

 extend well beyond the acicular lobes, bilobed or irregularly sinuous 

 (fig. 47a) N. longosetosa (p. 204) 



Nephtys squamosa Ehlers, 1887 



Figure 47e 



Nephthijs squamosa Fauvel, 1936b, p. 41. 

 Nephtys squamosa Hartman, 1950, p. 110. 



Description. — Length up to 50 mm., width up to 3 mm., segments 

 up to 120. Prostomium with anterior margin thin, spatuhite, with 

 translucent areas; lateral borders may be so inflated as to conceal 

 the neurosetal bundles. With dorsal lamellae on dorsolateral sur- 

 faces of body beginning on about setiger 17 (slight indication of them 

 more anteriorly). The lamellae become larger more posteriorly and 

 may overlap the following segments (fig. 47e). Similar ventral 



