FOUR NEW SPECIES OF POLYCHAETOUS ANNELIDS 

 COLLECTED BY THE UNITED STATES FISHERIES 

 STEAMER "ALBATROSS" DURING THE PHILIPPINE 

 EXPEDITION OF 1907-1910 



By Aaron L. Treadwell 



Department of Zoology, Yassar College, Pouglikeepsie, N. Y. 



In the course of the further sorting of the Albatross Philippine 

 collections additional marine annelids have come to light. The 

 specimens represent four new species — Macelliceyhala maculosa, 

 Iphionella elongata, Onwphis branchiata, and Maldane philrppinensis. 

 The earlier reports upon the polychaet worms of the expedition have 

 been published in this bulletin, as follows: Treadwell, Polychaetous 

 Annelids Collected by the United States Fisheries Steamer Albatross 

 in the Waters Adjacent to the Philippine Islands in 1907-1910, vol- 

 ume 1, part 8; Hoagland, Polychaetous Annelids Collected by the 

 United States Fisheries Steamer Albatross during the Philippine 

 Expedition of 1907-1909, volume 1, part 9; and Treadwell, Additions 

 to the Polychaetous Annelids Collected by the United States Fish- 

 eries Steamer Albatross, 1907-1910, Including One New Genus and 

 Three New Species, volume 6, part 2. 



MACELLICEPHALA MACULOSA, new species 



Figure 1 



The head and about 70 somites of the single specimen are pre- 

 served, these together having a length of 53 mm., with a body width 

 of 5 mm. In preserved material the general body color is light yel- 

 low, with a pinkish tinge on the dorsal surface of the anterior 25 

 somites. The breadth of the prostomium is twice that of its length, 

 and it is nearly oblong in form except for the rounded angles and 

 the slight protrusion on the anterior margin, where the anterior 

 tentacles are attached. (Fig. 1, a.) The eyes are prominent, the an- 

 terior ones being slightly the larger and located near the anterolateral 

 angles of the prostomium. The posterior eyes are situated at a dis- 

 tance about equal to their own diameter posterior to the anterior 

 ones. The tentacles are slender, sharp-pointed, about equal to the 

 prostomium in length, two inserted on the anterior prostomial mar- 

 gin and the third in a shallow depression on its posterior margin. 

 The tentacular cirri are much like the tentacles in form but are twice 

 their length and three times their diameter. The single remaining 

 palp is eight times as long as the prostomium and for the basal half 



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