1910.] NATURAL SCIENCES OF PHILADELPHIA. 491 



8 tori in a straight series. No thoracic membrane along sides or 

 posteriorly but an indistinctly four-lobed collar of moderate uniform 

 depth, lapping along the median line, reaching but a short distance 

 posteriorly with broadly rounded ends ; lateral incisions or clefts the 

 depth of collar forming three definite unequal parts, the middle one 

 emarginate in the center appearing as an indistinct double lobe. 

 Branchial lobes in the form of a rather deep collar-like membrane 

 attached in a semicircle to the comparatively small stem-like cephalic 

 lobe. The branchiae, 4 on each side in the largest example, arise from 

 this border and are peculiar in being but two sided, i.e., broad, flattened, 

 thin with a single row of rather stout long pinnae in the middle of the 

 inner surface, leaving a wide somewhat puckered margin or border on 

 each side. They are equal in length, twisted about each other in 

 retraction, and have elongated tapered naked tips. No operculum. 

 Tori and uncini of uniform size throughout entire body. Small 

 fascicles of setae on abdomen. Setae on thorax long, slender, tapered, 

 simple blades with long capillary ends, a few without blades, and in 

 the last three fascicles (7-9) a few with short blades and long, broad- 

 ened, deeply serrate ends. Setae on abdomen strongly bent at base 

 of moderately wide, somewhat abruptly tapered, conspicuously serrate 

 blades; additional long stiff hair-like ones along caudal region. Uncini 

 resembling those of Protula, with numerous exceedingly fine appressed 

 teeth and one very long fang-like end or terminal one. 

 Protula sp. 



Two imperfect unattached tubes of good size, over 40 mm. long and 

 4 mm. in diameter, are slightly tapered and somewhat tortuous, the 

 surface roughened by fine lines of growth. Only the branchial lobes 

 of the animal were found and are of interest in being elongated into 

 a spiral of about one and a half turns bearing numerous, between 

 thirty and forty (30-40), long slender branchiae having elongated 

 tapered naked tips; they undoubtedly belong to a species of typical 

 Protula. 



■ Protula diomeda? Benedict, 1886, has similar branchial lobes but 

 is a very much larger species, building tubes 4 or 5 inches long. 

 The type was found off Cape Hatteras, N. C, in 43 fathoms. Other 

 specimens are cited from the Gulf of Mexico in 111 fathoms, and 

 further rather remarkable range is given as extending north from 

 Chesapeake Bay to the Grand Banks in 65 to 1,290 fathoms. Protula 

 alba Benedict, 1886, from shallow water at St. Thomas, W. I., has but 

 twenty- five branchiae. 



Protula submedia Augener. 1906, from off the Windward Islands in 



