24 
17. 
18. 
19. 
W. A. HERDMAN. 
“94, vii 04; Lat. 58° 4945" 8.; Long. 124° 48° W., 5 fms.” (Twenty- 
three specimens. ) 
“95, vi. 04; Lat. 59° 19’ S.; Long. 120° 24' 30” W., 5 fms.” (Thirty-eight 
specimens. ) 
“98, vi. 04; Lat. 59° 34’ 30" S.; Long. 106° 28' 15" W., 5 fms.” (Forty 
specimens. ) 
DESCRIPTION OF THE PLATES. 
PLATE I. 
Tia. 1.—Styela spectabilis, from the left side ; natural size. 
Fic. 2.—Branchial aperture, from ventral surface ; slightly enlarged. 
Fic. 
3.—Atrial aperture, from dorsal surface ; slightly enlarged. 
Fic. 4.—Musculature of the mantle ; natural size. 
Fig. 5.—Part of the branchial sac, showing two folds (or,f.) and the intervening area ; natural size. 
Fie. 6.—Small part of the branchial sac, between two of the internal longitudinal bars (7.1.b.); x 50. 
Fic. 7.—Tentacles, dorsal tubercle and dorsal lamina; slightly enlarged. 
Fic. 8.—The alimentary canal and the gonads of the right side ; natural size. 
Fie. 9.—Some of the larger endocarps ; natural size. 
PLATE II. i . 
Fie. 1.—Halocynthia setosa, Sluiter ; natural size. : 
Fic. 2.—Section through the test and its dense covering of long spines ; natural size. 
Fias. 2a, 2B and 2c.—Terminal parts of three test spines of rather different types ; x 50. 
Fic. 3.—The body after removal of the test, 1o show the powerful musculature ; natural size. 
Fie. 4.—Tentacles, dorsal tubercle, dorsal languets, branchial folds, etc. ; natural size. 
Fic. 5.—Part of the branchial sac, showing three folds ; natural size. 
Fic. 6.—Small part of the branchial sac between two bars, showing the transverse vessels and the 
stigmata; x 50, 
