PEROPHORA ANNECTENS. OI 



EXPLANATION OF FIGUKES. 



Note.— All the figures, excepting 1, 2, 3, 10, 11 and 26a, were oiUliued 

 with the Abbe camera lucida, and as much of the details were drawn by 

 the same means as the nature of the object would permit. 



Plate I. 



Fig. 1. Small portion of a colony of Perophora on a leaf of Phyllospadix. 

 Natural size. 



Fig. 2. Small portion of a colony on a piece of sea weed. In this colony 

 the ascidiozooids are mostly much crowded and wholly embedded 

 in the common test; but a tew (/. zo.) are isolated. X 2. 



Fig. 3. A single zooid removed from the test. In the colony from which 

 this individual was taken the zooids were much crowded, and almost 

 completely covered a large Clavelina. X 30. 



Fig. 4. An enlarged portion of a colony, wholly compounded form, on a 

 leaf of Phyllospadix. The figure shows the edge of the colony 

 where the branching and anastomosing of the stolonic vessels, and 

 the knob-like terminations are well seen. X 23. 



Fig. 5. Small portion of a section of a colony, to show the completeness 

 with which the zooids are enveloped in the common test. X 25. 



Fig. 6. Section of a small portion of the tip of a stolon, with its thick- 

 ened epethelial lining (ep. v.), and two veryyoung buds [bd.). X 53. 



Fig. 7. Cross section of a stolonic mass enveloping a sartularian hydroid 

 (hy.) stem. X 50. 



Fig. 9. Digestive tract. X 109. 



Figures 10 and 11, drawn from the living animals, to show the spiral form 

 assumed by the heart wall during systole. 



Plate II. 



Fig. 12. Small portion of most anterior transverse vessel with its papilla?, 



the dorsal lamina and one of the dorsal languets. Seen from within. 



X 109. 

 Fig. 13. A single papilla. X 350. 

 Fig. 14. The branchial oritice and its lobes, seen from the outside, the 



zooid removed from the test. X 109. 

 Fig. 15. Ganglion and subneural gland and its duct, seen from within. 



X 316. 

 Fig. 16. Some of the tentacles, with parasites seen from within. X 115. 

 Fig. 17. Section of one of the infected tentacles, more highly magnified. 



X 230. 

 Fig. 18. Small portion of the musculature of the branchial siphon, seen 



from the outside, test removed. X 230. 

 Fig. 19. Testis and ovary of the Santa Cruz Perophora. X 109. 



2d Sek., Vol. IV. ( 6 ) October 26, 1893. 



