184 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
syphons are separate; they are long, dehcate tubular organs of 
equal diameter and are capable of extending at times more than 
the length of the shell. Sometimes one, then the other is longer. 
At the base of the syphons are two lappets with irregular rounded 
borders heavily marked with concentric scalloped wrinkles and 
fringed with papillae rather larger than those fringing the mantle 
edge. The openings of the syphons are marked by six deep 
scallops, rounded and not angular as in Tellina. Inside the peaks 
of the scallops a large, blunt papilla is seen, as shown in Fig. 37, c. 
Within the syphons the color is orange or salmon. No valve 
w^as seen. The syphons are marked at short intervals by en- 
circling lines continuing the entire length of the tubes. Begin- 
ning at the crest of the scallops a colored area of white spots 
occurs starting back from the encircling lines and extending a 
short distance, as shown in Fig. 37, c. The entire surface of the 
tubes is clothed with nearly microscopic papillae. The mantle 
is open except near the base of the syphons where a short space 
is connected in which may be plainly seen the cruciform muscles. 
Midway between the anterior and posterior ends the mantle 
shows a dark brown area. The foot is large and fleshy. The 
animal presents an interesting and beautiful appearance. The 
young shell was not found. I am indebted to Mr. William F. 
Clapp for living specimens of this species. 
CUMINGIA TELLINOIDES (Conrad). 
Fig. 38. Length, 12 mm. 
The syphons are separated and are capable of great extension. 
The anal syphon dilates at the end and becomes bulbous, then 
contracts at the aperture and becomes dilated in the middle, 
w^hile the branchial syphon, heavily ribbed by its contraction, is 
hardly exserted (Fig. 38, b). The syphonal openings are identical 
in appearance, the rim being cut into six deeply rounded scallops. 
Dehcate longitudinal striations mark the anal syphon (Fig. 38, a). 
These marks are fainter in Macoma fusca. Papillae border the 
edge of the mantle but do not show beyond the edge of the shell. 
The description of Macoma fusca would apply equally to Cumin- 
gia. The form and character of the shells, however, are different, 
being somewhat rugose in Cumingia, but the attitude of the 
