A. R Verrill on Ascidians from New England. 293 



con-ectly figured. The species are J/ effusum from the Gulf of 

 Suez, M. gibbulosum and M. caliculaium from Europe. M. nutans 

 (Johns., sp.) from England, appears to be another species. 

 Macroclinum crater Verrill, sp. nov. Figures 28 to 25. 

 This species forms large, thick, gelatinous, but firm masses, 

 which have a circular outline, with the upper surface deeply con- 

 cave or cup-shaped. The surface is covered with a thin layer of 

 closely adhering grains of fine sand, which are also diffused 

 24 throughout the mass. The 



» branchial and anal orifices are 

 \ quite small, close together, and 

 scarcely visible.in the contract- * 

 ed state. Animals rather large, 

 and pretty uniformly scattered 

 through the mass, but in some 

 parts forming large, irregu- 

 lar, somewhat circular groups. 

 The thorax and abdomen are 



1 length ; the branchial sac has about 

 it) transverse vessels, with numerous finer lon- 

 gitudinal ones ; the branchial orifice has six 

 small papillse ; the anal is terminal and slightly 

 bilabiate, with the lobe above it broad and 

 usually recui-ved at the tip. The stomach, m 

 most of the examples examined, was empty 

 and badly contracted; it appears to be deeply 

 lobed. The post-abdomen is very long and 

 connected to the abdomen by a somewhat nar- 

 rower, short pedicel. A conspicuous median 

 duct extends the whole length, with the vol- 

 nnimnn^ ovnries on each side. The ovulcs 



The common mass is 1*75 inches i 





V\ eter, and 1 high; the largest indinduals are 



X:^.. . , -50 to -66 of an inch long, and -06 to "07 m di- 



^^ ameter, at the thorax. . , 



^. Color in alcohol translucent yellowish white; the animals 



liglit yellow. 



Banks of Newfoundland,— T. M. Cofiin. 



Figure 24._One of the individual animals, extracted «°d ;nla'-ged^t diameters ; 

 «. anal orifice; ft, branchial; c, branchial ?ac; e, stomach; /' "'^^f;",^^^^^ ; 

 .ovary; q^ egg in process of development in the cloacal chamber or atnum, 5, 

 Jp/^C"r^ r op^oL side, Showing the th^r., «nd abdomen of 

 Tm^l individual, enlarged 10 diamete " " " 



