A. K Verrill on Ascidiansfrc 



Leptoclinuin albidum, sp. nov. 



Colonies encrusting stones, dead shells, ascidians, etc., forming 

 broad, thin, irregular, coriaceous crusts, with an uneven surface, 

 filled with minute, white, spherical, calcareous grains or corpus- 

 cles, which, under the microscope, have the surface covered 

 with projecting points. Surface of the crusts covered witl) 

 small, irregular, scattered prominences, in which the braiiciiini 

 orifices are situated. Cloacal orifices few and distantly sea t ; 

 Sjstenis irregular, the zooids scattered, but often arran- 

 rather indistinct concentric circles around the cloacal opf 



Color white, the zooids light yellowish. 



The colonies often become 1 to 2 inches across, somct; 

 inches or more long, and only -25 or less wide; thicku. - 

 dom more than 10, commonly about -05 ; zooids '02 to •(^■> 

 diameter -01 to -012 of an inch. 



Eastport, Me., low water dn under side of rocks, to lOc 

 oms on stony and shellv bottoms, common.— Expedition^ : 

 a. IOC ;^^ Grand Menan, 10 to 15 fathoms— Exji 

 ~ - ^ - - -A. E. 



_, .. _ ^_.., Tliinible 



Islands (near New Haven), Conn., 6 fathoms, on rocky bottom,- 

 A.K Verrill. ' .. 



Leptoclinum luteolu7n, sp, nov. 



This species forms thin, coriaceous crusts, like the preceding, 

 and filled in the same way with similar spherical corpuscle?. 

 The branchial orifices open' at the summits of low verruca?. Tlie 

 cloacal orifices are small, with four to six lobes, and distantly 

 scattered. Color deep salmon, or somewhat rosy. 



The crusts are of all sizes up to 2 inches or more in diav!"^' ' 

 and are usually somewhat thicker than in the precediiv- - 

 cies, with larger and darker colored zooids. 



Eastport, Me., andGrrand Menan, with the preceding spe 

 Expeditions of 1861, '63, '64, '68, '70, 



Under the name of '' Didemnium roseum Sars" Dr. Par : 

 probably included both this and the preceding species, 

 Bmney, in the second edition of Gould's Invert of Mas-. 

 merely copied from Dr. Packard's work. 



* Memoirs of the Boston Society of Natural History, vol. i, p. 276, 1^'3'- 



