196 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



appear and their surface becomes roughly granulous. The lateral avicu- 

 laria are generally abundant, very few cells being without one or both ; 

 they vary somewhat in size, form, and position, but are usually small 

 and near the aperture. The zooecial aperture is small, always with a 

 small, squarish mucro in front, and with a slender lateral process on 

 each side for the articulation of the operculum. In the secondary stages 

 of calcification, a strong, prominent, flat process often rises up on each 

 side of the aperture. 



Mucronella scabra Verrill. 



The relationship of M. scabra is not always obvious, owing to the fact 

 that usually only one large lateral avicularium is developed, and this is 

 crowded so far in front of the zooecial aperture as to appear like a large, 

 rostriform, median avicularium, facing sidewise. A careful examination 

 of the young cells will, however, usually show some cells with two lateral 

 avicularia, with the small median denticle of the aperture between them. 



Escharopsis VeiTill = Escharoides Smitt {non Edw. ). 



Bulletin National Museum, No. 15, p. 149, 1879. 



I proposed this name for a group, including two of Our larger, northern, 

 Eschara-like species. The zocecial aperture has a narrow median sinus, 

 which in the later stages of growth includes within it a small laterally 

 placed avicularium, facing sidewise. The genus is otherwise apparently 

 closely related to Escharina, Celleporaria, and Betepora.* Smitt, in his 

 Florida Bryozoa, even referred one of the species to Betepora {B. rosacea). 

 The growth of both our species is often Lepralian and foliaceous as well 

 as Escharine. 



Escharopsis lohata (Lamx.) Verrill = Escharoides Sarsii Smitt = Lepra- 

 lia producta Packard. 



Escharopsis rosacea (Sars) Verrill = Escharoides rosacea Smitt. • 



TUNICATA. 

 Ascidia inornata, sp. nov. 



In expansion the body is upright cylindro-conical, about twice as high 

 as broad ; the base is about the same in diameter as the middle portion, 

 and biit ver}^ little expanded. The oral tube is much longer than the 

 other, .-iubterminal, swoUen at base, tapering, the upper part cylindrical, 

 the o]»eniiig surrounded by seven low, rounded, thin lobes or crenula- 

 tions, between which are seven orange-colored oceUi ; corresponding 

 with the ocelli there are seven thickened, pointed lobes or folds of the 

 test, which mu down from them along the tube as slightly prominent 

 costai, with transverse wrinkles between them. The anal tube is sub- 

 terminal, shorter and smaller, situated to one side, and only about half 



* 111 a paper received from Dr. Smitt, since the above was written, he has enlarged 

 his genus Discojwra, so as to include the northern species of Betepora (E. cellulosa and 

 It. elonyata), and also the species here called Escliaropm rosacea. (Ofversigt af Kongl. 

 Vet.-Akad. Fiirh., 1876, p. 30.) 



