Boone, Annelida, Cruises of "Alva" 91 



being quite subequal thereto posteriorly. In length the parapodia 

 of the anterior region are equal to about one-third of the width of 

 the somite and posteriorly the parapodia approach one-half of the 

 width of the related somite. 



TTie first and second somites are coalescent, the first being in- 

 complete dorsally. The third somite is distinct. Setae are present 

 on the second and third tentacular somites. The tentacular cirri 

 each have a distinct, bulbous, basal joint. The first tentacular 

 cirrus is about 1.4 millimeters long, composed of about fourteen 

 annuli and is conical, tapered to a slender tip. The second tentacu- 

 lar cirrus, adjacent and ventral to the first, is similar, but only 

 1.3 millimeters long and consists of about twelve annuli. The third 

 cirrus consists of about sixteen annuli and is about 1.5 millimeters 

 long. The fourth tentacular cirrus is also composed of fourteen 

 annuli and is about 1.5 millimeters long. The first notocirrus is 

 much smaller than those following and is adjacent to the base of 

 the tentacular cirrus, nearly lateral in position. The succeeding 

 notocirri, each of which is supported on a large cirrophore and 

 are elongate-ovate, nearly lanceolate, typical representatives being 

 shown in plate 29, figure a. 



A typical parapodium, from somite one hundred, is shown. It 

 consists of a large neurocirrus, in the form of a subreniform, 

 bulbous organ, arising slightly post-ventrad to the neuropodium 

 and being subequal thereto, or only a trifle longer and thicker. 

 This neuropodium is a strong, subcylindrical process, compressed 

 in the cephalo-caudad direction, with the distal end obtusely 

 truncate, with an entire presetal lip and an entire postsetal lip. 

 The acicule is colorless, transparent, with only the blunted apex 

 protruberant beyond the neuropodial lobe, as shown in fig. b. 

 The setae are all complex, ten to twelve in number, set fanwise in 

 single series. Each setum consists of a proximal cylindrical rod, 

 distally enlarged into a nearly convex, externally spinose joint 

 which articulates with the blade-like distal article, which is two- 

 thirds as long as the proximal article and tapers distally to an 

 acuminate apex ; the outer lateral margin is beset with fine spinose 

 teeth. 



Phyllodoce gracilis, Kinberg, J. G. H., Ofv. Vetenskaps Akad. 

 Forh. Stockholm, 1865, Bd. XXII, p. 240 ; Kgl. Svenska Fre- 

 gatten Eugenies, under C. A. Virgin, Zool. Ill, Annulater, 



