54 THE AUSTRALIAN MUSEUM. 



[The following Styelinse have also been recorded from Australian 

 seas : 



Styela humilis, Heller. 



S. captiosa, Sluit. 



S. palinorsa, Sluit. 



S. phaula, Sluit. 



S. solvens, Sluit. 



&'. radicosa, Herdm. 



S. exiqua, Herdrn. 



Poly car pa radicata, Herdm. 



P. pedunculata, Heller. 



P. data, Heller. 



P. Stimpsoni, Heller. 



P. obscura, Heller. 



P. nebulosa, Heller. 



P. Bassi, Herdm. 



P. molguloides, Herdm.] 



Family IV. MOLGULHXE, Lac.-Duth., 1877. 



Body visually free, sometimes fixed, rarely pedunculated. 



Test cartilaginous, coriaceous, or membranous, usually covered with 

 sand, &c., which adheres to long hair-like processes of the test. Bran- 

 chial aperture 6-lobed, atrial aperture 4-lobed. 



Branchial sac usually longitudinally folded (5 to 7 folds on each side) ; 

 internal longitudinal bars not papillated ; stigmata more or less curved, 

 usually arranged in spirals. 



Tentacles always compound, usually much branched. 



Intestine attached to the inner surface of the mantle on the left side. 



Renal sac present, upon the right side of the body. 



Gonads on the inner surface of the mantle usually developed on 

 both sides. Larvae usually tailed, in a few specimens anurous. 



Only two of the eight genera of the family are represented, viz., 

 Molgula and (doubtfully) Ascopera. 



Molgula, Forbes, 1853. 



There are 4 species in the collection which fall into this genus, and 3 

 of them seem new to science. 



Molgula mollis, n. sp., PL Mol. I., figs. 14. 



External appearance. Shape between ovate and pyriform, much 

 compressed laterally, not attached. Anterior end wide, bearing both 



