CYNTHIA. 19 



Cynthia gutta. 



C'l/nthia ffutta, Lutken, see Stimpson, Pioc. Bust. Soc. N. H. iv. 231 (1852). 



Body flat and disk-like, oval, adhering by a very broad base. 

 Test strong, thin, smooth, opaque, deep red, expanded upon the 

 surface of attachment so as to form a margin. Orifices small, 

 square, slightly prominent. Diameter, half an inch. 



This species is very common in Boston Harbor, adhering to 

 dead valves of Mijtilus modiolus, on the shelly bottom between 

 Bird Island and South Boston Flats, where the depth is from three 

 to five fathoms. It resembles very much a drop of blood. 

 (^Stimpson.^ 



Cynthia placenta. 



Plate XXIII. Fig. 322. 



Ci/nthia placenta, Packard, Mem. of Bost. Soc. Nat. Hist. i. part 2, p. 277 (1867). 



Test broad, expanded, much flattened, very emarginate, about 

 five times as broad as high, with the thin edge uneven, revolute ; 

 surface granulated, though the scales are flattened. Anal and 

 branchial orifices much alike, of equal height, and as distant from 

 each other as the thickness of the test, which is half an inch in 

 diameter. 



One specimen covered with sand was larger and more rough- 

 ened about the orifices than the other specimen, which was smooth 

 and naked. 



Dredged in the straits of Belle Isle, forty fathoms, hard bottom; 

 Henley Harbor, ten to twenty fathoms, sandy; Chateau Harbor, 

 Long Island, fifteen fathoms, sandy. It is also common in the 

 Bay of Fundy. (^Packard.) 



The figure given of this species was drawn by Mr. Morse from 

 the original specimen preserved in alcohol. 



Cynthia condylomata. 



Plate XXIII. Fig. 324. 



Cynthia condylomata, Packard, Invert, of Labrador, &c. in Mem. of Bost. Soc. Nat. Hist. i. 



part 2, p. 277 (1867). 



Test spherico-conical, surmounted by a splnulated apex ; it is a 

 little higher than broad, with transverse rows of lighter-colored, 

 unequal, wart-like tubercles, which often terminate in minute, blunt 



