BRYOZOA OF WOODS HOLE REGION. 265 



Fig. 66. Smittia irispinosa var. nitida, portion of colony of typical nitida when fully calcified, draw-n to 

 same scale as figure 65. 

 66a. The same, a cell from another part of the same colony as 66; note the difference in the size of the 



cells. 

 66b. The same, a cell with large pointed avicularium. 

 66c. The same, a cell with small oval and large elongate avicularia. 

 66d. The same , ovicell showing secondar)' calcification. 



66e. The same, heavily calcified cell with thickened peristome, large roughened umbo and very 

 thick zooecial wall (avicularium impressed;. 

 Fig. 67. Porella concimia, detail of young cell. 



67a. The same, portion of colony in ordinary secondary calcificatio.i showing ovicell. 

 67b. The same, with central raised area due to secondary calcification. 

 Fig. 68. Porella cominna var. belli, fertile cell with two lateral avicularia, ovicell with irregular umbo, 



more highly magnified than figure 67a. 

 Fig. 69. Porella acutirosiris, portionof colony showing arrangement of cells. 



69a. Thesame, showing dctailsof infertile cell. 

 Fig. 70. Porella propinqua. portion of colony showing ovicells, oral avicularia and large avicularia — in 

 one case the large avicularium replaces the oral one. 

 70a. The same, ovicell with raised border. 

 Fig. 71. Porella proboscidea, portion of colony in earlier stages of calcification. 



71a. Thesame, young cell showing formation of ovicell and its connection with peristome. 

 71b. Thesame, primar>- orifice more highly enlarged, seen partly from in front. 

 71c. The same, older portion of colony, the secondary calcification rising above ovicells and rostra. 

 Fig. 72. Fluslrella /iis/>!(fa, young cells at margin of colony, showing spines and bilabiate orifice. 

 Fig. 73. Alcyonidium parasiticum i>OTiiona,t ciX^c oi colony, showing the broad tuberculate margin and 

 central hyaline area. 



PLATE XXVIII. 



Fig. 74. Alcyonidium myiili, portion of colony. 



74a. The same, a single cell showing retracted polypide and orifice. 

 Fig. 75. Alcyonidium verrilli, n. nom., young cells at edge of colony. 



75a. The same, in older part of colony showing thickness of superficial septa. 



75b. Thesame, cross-section of a branch 



75c. The same, section of a cell showing details of anatomy. 

 Fig. 76. Alcyonidium (7t/a/(noj«»n. showing the very thin superficial septa, from an English specimen. 

 Fig. 77. Alcyonidium hirsutum, showing papilla; and orifices, from an English specimen. 

 Fig. 78. Anguinclla pahnala, small colony showing manner of branching. 



78a. The same, a single zooccium. 

 Fig. 79. Bowerbankia gracilis var. caudaia, portion of colony. 



7ga. The same, details of anatomy. 

 Fig. 80. Bowerbankia gracilis, portion of colony at higher magnification than figure 79; the cells are 

 really smaller than those of cauia/a. 



80a, b, and c. The same, cells from the same colony as figiue 80, showing (a) absence of caudate 

 process, (b) very small caudate process, (c^ well developed process. 

 Fig. 83. Valkeria uva, portion of colon)', from an English specimen. 



83a. The same, details of anatomy. 



