. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12 DAVID G. COOK. FIGURE 2. Peloscolcx intermedius nov. sp. A. Male genitalia; B. Posterior ventral seta. 1. Cuticularized penis; 2. Atrium; 3. Prostate; 4. Vas deferens. DISTRIBUTION. Known only from Cape Cod Bay, Massachusetts, in waters 7 to 46 meters deep. REMARKS. P. inter me dins is closely related to P. apectinatus Brinkhurst, 1965 and P. swirencowi (Jaroschenko, 1948). (Table 1.) These three species, together with P. euxinicus Hrabe, 1966, P. gabriellae Marcus, 1950 and P. nerthoides Brink- hurst, 1965, form a comple
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12 DAVID G. COOK. FIGURE 2. Peloscolcx intermedius nov. sp. A. Male genitalia; B. Posterior ventral seta. 1. Cuticularized penis; 2. Atrium; 3. Prostate; 4. Vas deferens. DISTRIBUTION. Known only from Cape Cod Bay, Massachusetts, in waters 7 to 46 meters deep. REMARKS. P. inter me dins is closely related to P. apectinatus Brinkhurst, 1965 and P. swirencowi (Jaroschenko, 1948). (Table 1.) These three species, together with P. euxinicus Hrabe, 1966, P. gabriellae Marcus, 1950 and P. nerthoides Brink- hurst, 1965, form a complex of small, sparsely or finely papillate, marine worms whose male genitalia bear a strong resemblance to those of Tubtfex. It is suspected that future work on this group of species may reveal more intermediate forms in the complex which will invalidate many of the entities or reduce them to subspecific rank, and that such work will make necessary a critical reexamination of the generic limits of Peloscolex and Tubijex. TABLE I Differences between Peloscolex intermedius nov. sp. and its two most closely related species, P. apectinatus and P. swirencowi Character P. intermedius P. apectinatus P. swirencowi Hair setae With sparse lateral hairs Serrate Smooth Anterior dorsal setae Bind to seg. VI Bind Bifid to seg. V III Posterior dorsal setae Single-pointed, elongate Bifid Single- pointed , elongate Ventral setae ; upper tooth Longer Same or shorter Longer compared to lower Length vas deferens/ less than 3 length atrium Length penis/diameter penis. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-;
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