BRYOZOA OF WOODS HOLE REGION. 265 



Fig. 66. Smiltia trispinosa var. nitida, portion of colony of typical nitida when fully calcified, drawn 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 secondary calcification. 

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



thick zooecial wall (avicularium impressed). 

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



6ya. The same, portion of colony in ordinary secondary calcification showing ovicell. 

 6yb. The same, with central raised area due to secondary calcification. 

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



more highly magnified than figure 6ya. 

 Fig. 69. Porella acutirostris, portion of colony showing arrangement of cells. 



6ga. The same, showing detailsof 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. 

 7oa. The same, ovicell with raised border. 

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



7ia. The same, young cell showing formation of ovicell and its connection with peristome. 

 7ib. The same, primary orifice more highly enlarged, seen partly from in front. 

 7ic. The same, older portion of colony, the secondary calcification rising above ovicells and rostra. 

 Fig. 72. Flustrella hispida, young cells at margin of colony, showing spines and bilabiate orifice. 

 Fig. 73. Alcyonidium parasiticum portion at edge of colony, showing the broad tuberculate margin and 

 central hyaline area. 



PLATE XXVIII. 



Fig. 74. Alcyonidium mytili, 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. The same, cross-section of a branch, 

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



Fig. 76. Alcyonidium gclatinosum, showing the very thin superficial septa, from an English specimen. 

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

 Fig. 78. Anguinella palmata, small colony showing manner of branching. 



78a. The same, a single zooecium. 

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



793. The same, details of anatomy. 

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



really smaller than those of caudata. 

 8oa, b, and c. The same, cells from the same colony as figure 80, showing (a) absence of ca 



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

 Fig. 83. Valkeria uva, portion of colony, from an English specimen. 

 . The same, details of anatomy. 

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