L'2 W. A. IIHKD.MAN. 



S. HEXAGOXA, Quoy aiiil Gaiin. 



One ilainageil specinK-ii IVuin "Winter (^>uaiters, 1. \ i. 03, Ni>. 8 lu)le " pmltaldy 

 belongs to this speeies. 



DOLIOLlh.K. 



DOLIOLIM Sp, 



Four imperfect specimens of the " nurse " form of Dulkdum, raeasurini; from 4 to 

 7 mm., were brought ba',-k from " 1. vii. 04. Lat. 55° 44' S. ; Long. 95° 43|' W. 

 5 fathoms." It is impossible io determine the species now. 



LABYACEA. 



APPENDICULARIIDyE. 



OiKOPLEURA GAUSSICA. 



(Plate YIL, figs. 14-17.) 



OikopUura (jaussita, Lolimunn, Zool. .115., Suppl. viii. (r.)0;>), p. :{f>!). 



A small tube from the Winter Quarters in ^IcMurdo Bay, labelled " 18. v. 03, 

 No. 4 Hole, Plankton," contains three specimens of a large Appeutlicularian. They 

 are not in very good condition, and all probably belong to the same species, and in 

 external form and in detailed proportion of the internal organs seem to agree liettcr 

 with 0. gauffsica than with 0. valdivise — the two large Antarctic species described by 

 Dr. Lohmann.* The measurements of body and tail in these three ' Discovery ' 

 specimens are as follows : — 



Trunk . . 1 "25, mm., 1 '5 mm., 1 '5 mm. 



Tail ... 7 mm. U mm. [) mm. 



This .species was also found at ".3. i. 02, Lat. GG° 52' S. ; Long. 178° 15' E. " 

 — cue specimen: "7. i. 02, South of Pack" — 53 specimens; "11 Jan. 1902, Ro.ss 

 Sea " — one specimen ; and " 3-7 " — six specimens. In some of these specimens the 

 trunk measures up to 3 mm. in length, and the tail is about five times as long as the 

 trunk, and may be as much as 2 mm. in width at its widest part. 



Our fig. 14 on Plate VII. shows the appearance, to the eye, of these ' Discovery' 

 specimens of (probably) 0. (/aussica, and fig. 15 shows the tip of the tail enlarged. 

 Several sections through the tail are given in fig. IG (A to D) to show the very 

 dill'crcnt degree of development of the muscle bands in diflercnt {virts of the .same 

 tail. D shows a case where the dorsal muscle band is cn-tcrniinous with the iiotocliord, 



• Die Apx>cu>licularieD Jes nrktiscbcn und iiutarklisclicn Ucbiots, <.Vc. Zoolog. .Jubrb., i5ui>i)l. viii. (1U06;, p. 303. 



