4 W. A. IIKRDMAN. 



DOLIOLIDJE Doliolum rtsittibUe, Xeiinuinn ; * \mI. <>5*' 8. 



APPBNDicuLAHUD.t: Oikopleura ijaussica, Lolim. ; Lat. (iU:° S., Long. 90° E. (Lohmann). 



0. raldiviir, Lolim. : ditto. 



0. sp. 



Frilillaria borealin, f. t;//iira, Loliin. 



F. antarctira, I-dliin. 



Acconliiiji l<i this list fifty-two species are rcconled from the Antarctic area 

 south of GO^ S. lat. : eightv-one species were enumerated by Hartmeyer in " Fauna 

 Arctica" in 1903. 



In the following systematic statement the species are merely placed in families 

 under the three great divisions of the Tunicata — groups of intermediate rank being 

 considered unnecessary in a report of this nature. 



ASCIDIACEA. 



STYELID^. 



Styela spectabills. 



(Plate I.) 



Zmj^Vf/.— Winter Quarters, 17. i. 0.3, Flagon Point, Dredge, 10-20 fm.s. One 

 specimen measuring: — length 18 cm., tlorso- ventral breadth (greatest) 9*5 cm., lateral 

 thickness 7 cm., dorso-ventral breadth at posterior end 6"5 cm. ; across anterior end 

 from branchial to atrial aperture, 8 • 5 cm. 



E.vlernnl Appearance. — Body elongated, upright, somewhat Hagon-shaped or 

 swollen in tiic middle, not compressed laterally, attached by tlie posterior end 

 (Plate I., fig. 1, and text-figs. 1 and 2). Both apertures are on the anterior end, tlic 

 branchial turned ventrally and the atrial cjorsally ; both are large and distinctly 

 four-lobed (Plate I., fig.s. 2 and 3). The surface is even and fairly smooth, being 

 merely creased and somewhat corrugated (see text-figs. 1 and 2), l>ut these surface 

 foldings probably disjippear when the animal is expanded. Tlic colour (in .spirit) is 

 yellowish grey. 



7V.S/ thin, but leathery ; somewhat corrugatetl on the surface and finely wrinkled 

 in places; white in .section and for the most part less than 1 mm. in thickness. 



Mantle thin, but very muscular, closely adhering to test. External lajcr of 

 circular and internal layer of longitudinal muscle bundles form a clo.se and fairlv 

 regular network (.see Plate I., fig. 4). 



• Dr. Neumann described (Zool. Anzeiger, 5th Jan., 1909, p. 791) a new Pyroaoma and this new Doliolum 

 from the collection of the Oenuan South Polar Expedition. It is only the Dolioliini, however, that is really an 

 Antarctic fonn. found in latitudes 64" and 65" S., as the Pyroioma (P. ovattim, Neuin.) was obtained in the 

 South Atlantic at 80" S. latitude. 



