Ko. 104.] 151 



the body ; they soon settle to the bottom, and immediately construct 

 a new tube of any loose dirt that may be at hand. 



The first part of the generic name is intended to recall their 

 peculiar method of locomotion. The specific name is given in rec- 

 ognition of Mr. James E. Benedict, a sound and enthusiastic 

 naturalist — my associate for the past two years in zoological work, 

 who not only discovered the species in New Jersey, but has since 

 found it in South Norwalk, Conn. 



Female. 



On one specimen the middle third of the dorsum was covered by 

 a very thin, transparent, raised membrane. Unfortunately no 

 figures of the young were made, and the notes are not full. Thej' 

 wei*e broadly rounded in front and behind ; sides convex ; two small 

 red eyes on the anterior margin of the head ; lateral depressions in- 

 dicating three"segments; two circles of cilia, one just back of the 

 head, the other near the posterior end. 



Fam. AEICIIDJE. 



AXTHOSTOMA Schmarda. 

 Neue Wirbellose Thiere, vol. 1, part ii, p. 61. 1861. 



Anthostoma fragile Yer}nll. 



VerrilI/. Invert. Animals of Vineyard Sound, etc., p. 598. 1874. 

 Webster. Annel. Chset. of the Virginian Coast, p. 258. 1879. 



The branchiae may begin on any segment from the thirteenth to 

 the twenty-first, according to the size of the specimen. 

 Common in sand at low water. 



Fam. CIERATULID^. 



CIRRATULUS Lamarck. 



Hist. Nat. des-Animaux sans Vertebres, vol. v, p. 300. 1838. 



CiRRATULrs GKAXDis YerHll . 



Verrtll. Invert. An. Vin. Sound, etc., p. 606, pi. xv, figs. 80, 81. 1874. 

 Webster. Annel. Chaet. of the Virginian Coast, p. 258. 1879. 



Rare ; only one specimen was taken. 



CIRRHINEREIS Qv/itrefages. 

 Histoire Naturelle des Anneles, vol. i, p. 463. 165. 



CiRRHINEREIS FRAGILIS Qtrfg. 



€irrhahilusfragilis Leidy. Marine Invert. Fauna R. I. and N. J., p. 15, pi. xi, 



figs. 39-43. 1555. 

 Cirrhinereis fragilis Quatrefages. Op. cit., vol. i, p. 464. 1865. 

 " " Verriul. Op. cit., p. 607. 1874. 



Rare ; a single injured specimen was found which probably be- 

 longs to this species. 



