PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 181 



nite structural characters from N^otomastus Sars. Therefore, the two 

 species formerly described by me from Casco Bay as Ancisfria capillaris 

 and A. acuta should be named Xotomastus capillarifi aud JSf. acutus. 



Polycirrus phosphoreus, sp. iiov. 



A large, haudsome, bright red species, remarkable for it« brilliant 

 violet-blue jihosphorescence 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 

 setae exist on twenty-four segments. The uncini 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 having 

 capillary setae 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 surface, becoming nar- 

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

 shields are smaller aud more distant, squarish, bilobed, and separated 

 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 setse ; 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 livuig examples. 



From off 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 1803, 1861, 1868, 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 liont clavate or 

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

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

 body. 



Oft" Cape Cod, 122 fathoms, soft mud (U. S. Fish Commission, 1879). 



Spirorbis Stimpsoni, s]). noA . 



Spirorbis nautiloides? Verril], in former papers. See TruuH. Gouii. Acad., vol. 

 iii, p. 45, pi. iv, fig. 4 {non Lamarck). 



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

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



