70 BULLETIX OF THE 



specimen from off Nova Scotia, showing the extreme variation in 



form. 

 Fig. c. Tlie same. One of the large spine-Hke spicula (e) from the margins of tlie 



calicles. Enlarged 22 diameters. 

 " Od. The same. Spicula : /^ //, fusiform spicula found in the calicles and coen- 



enchyma ; /;, /,-, spicula with enlarged ends, from the calicles; i,J, small 



spicula from the tentacles. Enlarged 22 diameters. 

 " 4. Lf'pidisix lun</ljh)ra V. One of the calicles of an alcoholic specimen from 



the West Imlies. Enlarged 8 diameters. 

 " 4 a. The same. Scale-like spicula of the cwnenchyma ; /), two of the larger ; 



c, two of the smaller forms. Enlarged 75 diameters. 

 " 5. Acanella eburnea (Fourt.) V. One of the calicles, from an alcoholic speci- 

 men. Enlarged 8 diameters. From a West Indian specimen. 

 " G. Aiil/iothela ijrandijloni (Sars) V. Two branches from a ramose alcoholic 



specimen, taken oft; Nova Scotia. Natural size. 

 " 6 a. The same. Spicula: e, /, rough fusiform spicula from the ccenenchyma ; 



(J, h, from the calicles. Enlarged 75 diameters. 

 " 7. Iuiiifj)!ithija Liltkeni V. Branch of a specimen in alcohol, from off Nova 



Scotia. Enlarged 2 diameters. 

 " 7 a. Tlie same. Spicula : h, one of the rough club-shaped spicula from the 



calicles ; c, d, rough fusiform spicula from the ca-nenchyma. Enlarged 



75 diameters. 



PLATE V. 



Fig. 1. Arl/naiirje longironiis V. View of the expanded disk and tentacles, from 



life. One half natural size. 

 " 2. The same specimen. Side view in partial expansion. The dotted line 



shows the extent of the basal concavity. One half natural size. 

 Figures 1 and 2 are from one of the original type-spceiaiens, dredged by 



the U. S. Fish Connnission in 1880, and kept in an acpiariuin for 



several days. 

 " 3. Fldhel/um (I'oodei V. Side view of a dry and somewhat broken specimen 



from the fishing banks off Nova Scotia. From a photograph. Natural 



size. 

 " 4. The same. Top view of an alcohic specimen, dredged off Martha's Vine- 

 yard by the U. S. Fish Commission. TIatural size. 



FLATE VI. 



Figs. 1 to 1 c. Three examples of Sfir/nrl/n (iln/fmico/n V., attached to the tube (//) 

 of Ifi/aliii'icin nrtlfe.r V., natural size ; //, liead and anterior segments of 

 the annelid protruded from the tube, side view; /, tlie ;>2il and -Jod 

 seumeiits of the same annelid, natural size; ;, caudal segments and 

 cirri, enlarged 2 diameters ; k, under side of head and anterior seg- 



