231 



or purple lines descending on each of the four sides, and becom- 

 ing paler and finally lost on the body. Branchial sac with about 

 fourteen folds. Diameter two inches. 



It is usually covered with corallines, and in its tunic Mytili 

 are often imbedded. It was found in great numbers on Oak 

 Island Beach, near Smithville, N. C. by Lieut. Kurtz, probably 

 thrown up from deep water. It occurs in groups of several in- 

 dividuals, young and old, attached to each other. 



C. PARTITA. Body oblong or subglobular, attached by the 

 base. Test hard, strong, coriaceous, rugose, wrinkled in vari- 

 ous directions, and of a dark purplish-brown color. Apertures 

 square, on prominent eminences, opening widely, the branchial 

 being largest. The tubes are very beautifully marked exteriorly 

 by alternating triangular areas of white and purple, arranged as 

 in the shell of a Balanus ; the white ones having their bases, 

 and the purple ones their apices, on the margin of the aperture. 

 In one instance parallel stripes took the place of triangles. Dia- 

 meter one inch. 



It is occasionally dredged in Boston Harbor, west of Govern- 

 or's Island, in four fathoms, among stones and shells. 



C. suBCiERTJLEA. Body firm, hemispheric, adhering by the 

 base. Test thin but tough, smooth, translucent, with a pale 

 bluish tinge. Orifices small, sessile, not far removed from each 

 other. Diameter one fourth of an inch. 



This species I found attached to corallines thrown ashore on 

 Oak Island Beach, N. C. 



C. GUTTA. Body flat and disk-like, oval, adhering by a very 

 broad base. Test strong, thin, smooth, opaque, deep red, ex- 

 panded 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 Mytilus 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. 



