292 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



which has probably, if observed at all, been confused with 

 Amaroucium proliferum, a species which it closely resembles 

 in external appearance. 



The colonies of Morchellioides alderi are sometimes ovate 

 or pyriform, with short stout peduncles (PI. VI, fig. 2), in 

 other cases they are nearly cylindrical. The thorax of the 

 Ascidiozooid is long (PI. VI, fig. 3), the abdomen is short, 

 and the post-abdomen is very long and slender, it is not 

 separated from the abdomen by any marked constriction. 

 The eight lobes surrounding the branchial aperture are long 

 and pointed (PI. VI, fig. 3, br.). The atrial aperture is placed 

 on the dorsal edge some way back from the anterior end. It 

 is a large rounded opening with a long narrow atrial languet 

 placed upon its anterior margin. There are a large number 

 of rows of stigmata in the branchial sac. The ciliated cells 

 are distinct. The endostyle undulates from side to side in 

 its course (PI. VI, fig. 3, en,). 



The oesophagus leads backwards from the posterior end 

 of the branchial sac to the large globular areolated stomach 

 (PI. VI, fig. 3). The intestine, after running for a short 

 distance posteriorly from the stomach, turns dorsally and 

 then anteriorly to become the rectum, which runs forwards 

 along the dorsal edge of the abdomen and thorax. The post- 

 abdomen is very long and narrow (PL VI, fig. 3, p, ah.). All 

 the Ascidiozooids in the colonies examined had the male 

 reproductive organs developed, but none showed ova. The 

 vas deferens is long and conspicuous. Its course is some- 

 what convoluted. Well developed tailed larvae were found 

 in some of the specimens. They had the single pigmented 

 sense organ placed far back in the body. 



This species may possibly be the one briefly described 

 under the name of " Sidnyum turbinatum, Sav. ? " by Alder, 

 in 1848.* It is certainly not a Sidnyumy and so far as I 



* Gat. Mar. Mollusca, <£;c., p. 109. 



