42 THE AUSTRALIAN MUSEUM. 



and contain each about 6 to 8 narrow closely placed stigmata. The 

 transverse vessels are all much of the same size, but are rather irregular 

 in their course. They have rather wide horizontal membranes. 



Dorsal lamina a plain membrane, fairly wide. 



Tentacles about 24 larger and the same number of much smaller inter- 

 mediate ones, also minute buds. 



Dorsal tubercle simple, and of broad cordate form, with both horns 

 turned in. 



Locality. Port -Jackson ; 16 specimens, along with Microcosm/us 

 Ramsay i. 



The specimens of this species are all much alike, and have the 

 external appearance and colour of a Microcosmus (PI. Cyn. XV., fig. 1). 

 The test, however, is only wrinkled, not encrusted with foreign bodies. 



The dorsal tubercle is wider than high (fig. 6), and the horns are 

 more or less coiled in, in different specimens. Figure 7 shows an extreme 

 case. 



The gonads consist of one or two large sausage-like glands upon each 

 side of the body. 



Figure 4 shows 2 rows of meshes and part of a fold from the 

 branchial sac. 



In size the specimens vary from 2 by 2 by 1 cm. to 4-5 by 5 by 2 cm. 

 In nearly all cases the body is as wide or wider than its length, and 

 about twice its thickness. Figures 2 and 3 show two other variations in 

 shape. 



The tentacles are shown in fig. 5. In addition to the large ones 

 visible to the eye, there are smaller intermediate, and also quite minute 

 buds, which do not project over the edge of the strong muscular band. 

 I have named this species personata, on account of its close resemblance 

 externally to the totally different Ascidian Microcosmus Ramsayi, with 

 which it appears to be frequently associated. 



Styela stolonifera, n. sp., PI. Cyn. XV., figs. 811. 



External appearance. Shape irregularly ovate, with the posterior 

 end the wider, and the body compressed laterally. Both apertures are 

 anterior, and are on distinct elevations not far distant. The posterior 

 end bears a large tuft of remarkable root-like processes nearly as long as 

 the body. The surface is smooth, but slightly grooved and wrinkled. 

 Colour milk white. Length 4 cm., breadth 3 cm, thickness 2 cm., 

 length of processes nearly 4 cm. 



Test soft and leathery, whiter inside than on the surface. 



