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 monosipbonic; 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. 
(0, 6) The basal tubes seen in tranverse section and surrounding the larger and thicker-walled 
tubes (c, c) which form the fascicled stem of the eryptolaria, 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. 
PAW By Xela. 
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 hydrothece have begun to recede from one another. 
Fig. 5. Portion of stem viewed laterally, magnified. 
Fig. 6. Proximal extremity of stem, magnified. The hydrothece of each pair have receded fiom one 
another, and now occupy opposite sides of the stem. 
PalcAVI Xe Vi: 
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 hydrothece and gonangium, magnified. In the uppermost hydrotheca 
