. The ascidians collected by the United States fisheries bureau steamer Albatross on the coast of California during the summer of 1904 . specimen from near Point Loma, that shownin 17 being from near Point Pinos. X 4. Figs. 20 and 21.—C-ulcolus i>>/ni»ii<l« 20. Side view of the whole animal, X 21. Dorsal view same specimen, X 2. Figs. 22 and 23.—Microcosmus tmnsvcrsus. Fig. 22. Side view of the whole animal, X 1. Fig. 23. The same specimen removed from the test and the mantle cut openand laid back, X 1. Figs. 24 to 29.—Benthastidia michaclsciii. Fig. 24. The column with
. The ascidians collected by the United States fisheries bureau steamer Albatross on the coast of California during the summer of 1904 . specimen from near Point Loma, that shownin 17 being from near Point Pinos. X 4. Figs. 20 and 21.—C-ulcolus i>>/ni»ii<l« 20. Side view of the whole animal, X 21. Dorsal view same specimen, X 2. Figs. 22 and 23.—Microcosmus tmnsvcrsus. Fig. 22. Side view of the whole animal, X 1. Fig. 23. The same specimen removed from the test and the mantle cut openand laid back, X 1. Figs. 24 to 29.—Benthastidia michaclsciii. Fig. 24. The column with holdfasts, X 2. Fig. 25. A small tuft of the holdfasts, 12. Fig. 26. Some of the mantle musculature in the region of the supposedbranchial orifice. Fig. 27. The digestive apparatus and sexual organs, X L Fig. 28. Out lire of the digestive tract, showing the tuft of filiform appen-dages near the esophageal orifice and a fragment of thebranchial membrane attached. Fig. 29. A portion of the tentacular circlet and hypophyseal region seenfrom within. [50J UNIV. CAL. PUBL. ZOOL. VOL. 4 [RITTER] PLATE 2 -^— • , y i . ••. PLATE 3. Figs. 30 to 34.—Afse-iflia elemental. Fig. 30. A fragment of the branchial 31. The whole animal, X -. Fig. 32. The animal removed from the test, showing intestinal tract, re-productive organs and kidney. Fig. 33. Hypophyseal complex, dorsal lamina, and tentacular circlet seenfrom within. Fig. 34. Small piece of branchial membrane with two of the large trans-verse vessels. Figs. 35 to 38.—dona 35.—The animal removed from the test, X 2. Fig. 36. Hypophyseal region with dorsal languets and a portion of thetentacular circlet. Fig. 37. A single tentacle. Fig. 38. Portion of the branchial membrane, inner surface. Fig. 39. A zooid of Psammaplidium Spauldingi, X -0. Figs. 40 and 41.—Dideiniunn opacum. Fig. 40. The colony X 1. Fig. 41. A branchial sac much enlarged. [52] UNIV. CAL PUBl. ZOOL. VOL. 4 [RITTER] PLATE 3 y
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