PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 181 



nite structural characters from Notomastus Sars. Therefore, the two 

 species former!}^ described by me from Casco Bay as Ancistria capillaris 

 aud A. acuta should be uamed j^otomastus cajnUaris and a\^. acutus. 



Polycirrus phosphoreus, sp. nov. 



A large, handsome, bright red species, remarkable for its brilliant 

 violet-blue i)hosphorescence when disturbed. 



Body very changeable in form, soft and flaccid, usually swollen ante- 

 riorly, narrowing somewhat near the head, and more attenuated poste- 

 riorly. Tentacles very numerous, originating from an elongated and 

 somewhat spatuliform cephalic process. Fascicles of acute, capillary 

 setiiB exist on twenty-four segments. The unciui commence on the tenth 

 setigerous segment. They are minute, strongly hooked, and form a 

 linear row, consisting of about twenty on the tenth segment, and of thirty 

 to forty on the succeeding ones. The posterior region not h'aviug 

 capillary set?e consists of thirty or more segments, toward the end 

 becoming very short and indistinct. Anal segment small, simple, with 

 a minute papilla. Ventral glandular shields conspicuous on the nine 

 anterior segments, covering the whole ventral siuface, becoming nar- 

 rower backward, and bilobed; beyond the ninth segment the ventral 

 shields are smaller and more distant, squarish, bilobed, and s<iparated 

 by a median furrow. On the nine anterior segments there is also a 

 thickened, annular, light-colored, glandular area, just below the fasci- 

 cles of set*; farther back these become rudimentary. Color bright red 

 or blood-red. In August, females were tilled with large quantities of 

 light red ova. Length, up to 75""" to 80'"™; greatest diameter, 4""" to 5'""'. 

 Described from living examiiles. 



From oif Stonington, Conn., to the Bay of Fundy, in 10 to 50 fath- 

 oms. Common in the Bay of Fundy, where it was collected by the 

 writer in 1SG3, 18G4, 18G8, 1870, 1872. Casco Bay and Massachusetts 

 Bay (U.S. Fish Commission). 



Trichobranchus glacialis Malmgren. 



In life, the anterior part of the body is swollen, bright red, brightest 

 near the head on the dorsal side. Posterior portion of body slender, 

 yellowish or greenish. Lip and cephalic lobe bright blood-red anteriorly. 

 Below the mouth is a turgid fold, which is light red, crossed by longitu- 

 dinal lines of bright red. Tentacles whitish, those in front clavate or 

 spatulate, the posterior ones very numerous, slender, filiform. Bran- 

 chiae slender, cirriform, in length about equalling the diameter of the 

 body. 



Off Cape Cod, 123 fathoms, soft mud (U. S. Fish Commission, 1879). 

 Spirorbis Stimpsoiii, sp. uov. 



Splrorhis iianfiloidcsf VeiTill, in former papers. See Trans. Conn. Acad., vol. 

 iii, p. 45, pi. iv, fig. 4 (hoh Lamarck). 



Tubes dull white, opaque, terete, rather closely coiled, the aperture 

 not raised ; surface somewhat rough with the lines of growth, often 



