Perkins.] 160 [November 3, 



in deserted Teredo tubes, quite a number that were tubular in form, 

 some being forty nine mill, long, seven mill, high and five and two 

 fifths mill, broad. Others, growing where tubes crossed, had grown 

 out on each side, forming a quite regular T- The upper valve was 

 flat in all cases. Animal whitish; mantle open, edge double, much 

 thickened, fringed with numerous papillae ; gills long, rather narrow, 

 curved so that the ends are nearly at right angles, nearly equal, 

 edged with a white cord; foot none; palpi not long, broad at the 

 base, anterior edge curved, posterior nearly straight, striated within. 



MEASUREMENTS. 



Length of shell 90 mill. Breadth 57 mill. 



" animal 72 " " 41 " 



" gills 62.2 " " 8 " 



" palpi 8 " " 15 " 



ANOMAD^l. 

 Anomia Linne, 1767. 



Anomia ephippium Linn., Syst. Nat., 1150; Lam., An. sans 

 Vert., Vol. vu, p. 273; Gould, Invert. Mass., p. 138; De Kay, Moll. 

 N. Y., pi. xii, fig. 209. 



Very common on rocks, old shells, etc., near low water mark. 



TUNICATA. 



ASCIDIAD^. 



Ascidia Linne, 1758. 



Aseidia manhattensis De Kay, Moll. N. Y., p. 259. 

 Common near low water on eel-grass, stones, chips, etc., and at 

 times thrown upon the shore in large numbers. 



MOLGULA. 



Molgula arenata Stimps. 



Not common usually. It was, however, at one time dredged in 

 abundance east of the Lighthouse, by Prof. F . A. Bradley. 



Didemnium sp? 



One cluster of an Ascidian of this genus has been found by Prof. 

 Verrill. 



