406 W. G. Van Name — Bermuda Ascidians. 



Figure 54. — Botrylloides nigrum Herdman. Zooid seen from the right side. 



No reproductive organs developed. Page 374. 

 Figure 55. — Botrylloides nigrum, var. nov. planum. Zooid seen from above 



(from the dorsal side), x 32. Page 377. 

 Figure 56. — Diplosoma at ropunc latum, n. sp. Zooid seen from the left side. 



x 32. Page 370. 

 Figure 57. — Diplosomoides fragile, n. sp. Zooid seen from the left side, fully 



expanded, x 32. Page 370. 

 Figure 58. — Dij>losomoides fragile. Spicules. x 450. Page 370. 

 Figure 59. — Diplosoma lacteum, n. sp. Zooid seen from the left side. x 32. 



Page 369. 

 Figure 60. — Diplosoma macdonaldi Herdman. Zooid seen from the left side. 



Eectum containing pellets of undigested material, x 32. Page 368. 



Plate LIV. 



Figure 61. — Michaelsenia tincta, n. sp. Zooid seen from the right side. The 

 outline about it is that of the mantle, not the test. To simplify the figure 

 the internal longitudinal bars of the branchial sac are not indicated. (See 

 figure 63.) x 24. at. £u.=atrial tentacle. Page 381. 



Figure 62. — Polysyncraton amethysteum, n. sp. Zooid seen from the left side, 

 showing the muscle bands in the mantle, x 32. Page 366. 



Figure 63. — Michaelsenia tincta, n. sp. Part of the endostyle and two of the 

 folds of the branchial sac. Showing internal longitudinal bars, x 48. 

 Page 381. 



Figure 64. — Polysyncraton amethysteum, n. sp. Spicules, x 450. (See also 

 figure 67.) Page 366. 



Figure 65. — Polysyncraton amethysteum . Upper surface of part of a colony 

 including the branchial orifices of two zooids. Showing the distribution of 

 the spicules, which are confined to the upper surface of the colony. x 16. 

 Page 366. 



Figure 66. — Polysyncraton amethysteum. Zooid seen from the anterior end, 

 containing a large egg ; showing displacement of the coils of the vas 

 deferens due to the enormous development of the egg, which has reached its 

 full size, x 32. Page 366. 



Figure 67. — Polysyncraton amethysteum. Spicules from a colony in which they 

 average of smaller and more uniform size than those shown in figure 64. 

 x 450. Page 366. 



Figure 68. — Diandrocarpa botryllopsis, n. sp. Zooid seen somewhat obliquely 

 from the right side. (The reproductive organs of the left side are indi- 

 cated in outline.) This individual is less compressed dorso-ventrally than 

 is usually the case, x 32. Page 383. 



Plate LV. 



Figure 69.— Styela partita (Stimpson), from Wood's Hole, Mass. Part of the 

 branchial sac from near the middle of the body extending from the 

 endostyle to the dorsal lamina, x 10. (Introduced for comparison with 

 the Bermuda form.) Taken from the specimen shown in figure 77. Page 

 389. 



