PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 



107 



Figure 36. — Clavelina (Synclavella) arafurensis Tokioka: a, three cormidia of the larger 

 colony; b, distal surface of a cormidium showing apertures of two zooids; r, right side 

 of thorax; d, left siae of abdomen; e, ciliated groove;/, dorsal languet. 



Cormidia attain a maximum length of 32 mm., but are usually 25 

 mm. in length and 5 mm. in thickness. Number of zooids embedded 

 in respective cormidia varies from 3 to 9, averaging 5 or 6. Zooids 

 arranged with ventral sides towards periphery. Corona soft, slightly 

 milky white, transparent, and contains thoraces and anterior parts of 

 abdomens; peduncular portion yellowish white, rather hard, translu- 

 cent, fi'e(iuently covered with foreign material. Anterior portion of 

 zooid slightly proti-udes from distal surface of corona, as shown in 

 fig. 3G/y. AVhen animal is alive body dark blue, nearly black, margin 

 of apertures very bright yellow. In preserved specimens, thorax 



200 191— 67 — —8 



