DESCRIPTION OF THE PLATES. 59 



PLATE XII. 



Figs. 1-5. Halecium macrocephalum. 



Fig. 1. Entire colony, natural size. 



Fig. 2. Portion of a branch with hydrophores and hydranths, magnified. 



Fig. 3. Portion with two hydrophores, still further enlarged. 



Fig. 4. An internode carrying a male gonangium. 



Fig. 5. An internode with a female gonangium. 



Figs. 6-10. Cryptolaria conferta. 



Fig. 6. An entire colony, natural size. 



(a) One of the clusters of flask-shaped bodies associated with it. 

 Fig. 7. A portion taken from a point near the proximal end where the stem is still fascicled ; magnified. 

 Fig. 8. A portion taken from a point near the distal end where the stem is monosiphonic ; magnified. 

 Fig. 9. A portion of one of the associated clusters of flask-shaped bodies as seen in section, parallel to 

 the axis of the cryptolaria stem ; magnified. 



(a, a) Acrocysts (?) into which the contents of the capsule have escaped. 

 Fig. 10. A portion of the same as seen in section transverse to the axis of the stem, 

 (a) Flask-shaped capsules with their contents still included. 



(b, h) The basal tubes seen in tranverse section and surrounding the larger and thicker-walled 

 tubes (c, c) which form the fascicled stem of the cryptolaria, and are here also seen 

 in transverse section. 



PLATE XIII. 



Figs. 1-3. Cryptolaria abies. 



Fig. 1. Natural size. 



Fig. 2. Portion of a branch taken from a point near its distal end, where it has lost its fascicled condi- 

 tion ; magnified. 



Fig. 3. Portion of stem with the proximal parts of two branches showing the fascicled condition of the 

 hydrocaulus ; magnified. 



4, 5. Cryptolaria longitheca. 



Fig. 4. Natural size. 



Fig. 5. Portion of a colony, magnified. 



PLATE XIV. 



Figs. 1, 2. Cryptolaria elegans. 



Fig. 1. Entire colony, natural size. 



Fig. 2. Portion taken from the distal extremity of the colony, magnified. 



Figs. 3-6. Desmoscyphus longitheca. 



Fig. 3. Several stems attached to some foreign body, natural size. 



Fig. 4. Front aspect of a portion of a colony from a point near the basal end of the stem ; magnified. 



The lowest hydrothecae have begun to recede from one another. 

 Fig. 5. Portion of stem viewed laterally, magnified. 

 Fig. 6. Proximal extremity of stem, magnified. The hydrothecas of each pair have receded fjom one 



another, and now occupy opposite sides of the stem. 



PLATE XV. 



Figs. 1, 2. Thuiaria pinnata. 



Fig. 1. Entire colony, natural size. 



Fig. 2. Portion of a pinna with hydranths, magnified. 



3-5. Sertularella Gayi var. robusta. 

 Fig. 3. Natural size. 

 Fig. 4. Portion of a branch with hydrothecae and gonangium, magnified. In the uppermost hydrotheca 



