OF THE ACALEPH5: OF NORTH AMERICA. 373 



Fig. 2 gives a view from above, with the same position of tlie parts, the lobes, however, projecting a little more, and 

 the auricles crossing each other. 



Fig. 3. A view of the same from below, corresponding, in the arrangement of those parts, to Fig. 2. 



Fig. 4. A profile view of the animal in the same attitude as in Fig. 1, but with the lobes opening. 



Fig. 5. A view from above, in the same position as that shown in Fig. 2, but with the lobes expanding in the direction 

 of the auricles, so that the longitudinal diameter is less when compared to that in Fig. 2. 



Fig. 6. A profile view in a position at right angles with that of Fig. 1 and 4 ; so that one of the lobes is in sight, with 

 its broad outer surface, and the four auricles appear as projections in two p.iirs on the right and left. 



Fig. 7. A view from above, in the position of Fig. 2 and 5 ; but the lobes are expanded, and the auricles are stretching 

 in parallel directions. 



Fig. 8 represents the same as scon from below, also in the same position as that shown in Fig. 3, but with the lobes 

 open ; so that the mouth is entirely uncovered. 



Fig. 9 gives a view of a specimen in the same position as that shown in Fig. 7, the lobes, however, still more elon- 

 gated ; so that the longitudinal diameter of the animal exceeds by far the transverse diameter. 



Fig. 10 represents the same from below. 



On comparing all the figures in this plate, we have Fig. 1 and 4 in the same attitudes, differing only in the degree of 

 expansion of the lobes. We have Fig. 2, 5, 7, and 9, views from above, diiTering, also, chiefly in the degree of expan- 

 sion of the lobes. Fig. 3, 8, and 10 are views from below, facing the mouth, differing also in the degree of expansion 

 of the lobes. While Fig. 6 represents a profile view, in a direction at right angles with that shown in Fig. 1 and 4. 



Plate VII. 



Enlarged figures of Bolina alata, in various attitudes. 



Fig. 1. Corresponding to Fig. 1 of Plate VI. 



Fig. 2. Corresponding to Fig. 4 of Plate VI. 



Fig. 3. In the same attitude, the lobes still more expanded, and^turned inside out. 



Fig. 4. Corresponding to Fig 6 of Plate VI. 



Fig. 5. A view from below, corresponding to Fig. 3 of Plate VI., the lobes, however, being farther open, so as to en- 

 tirely uncover the mouth. 



Fig. 6. Corresponding to Fig. 2 of Plate VI. 



Fig. 7 gives an enlarged view of the horizontal chymiferous tubes, and their connection with the vertical funnel below 

 the circumscribed area and the bulb of the eye-speck. 



PL.4TE VIII. 



Fig. 1. A profile view of BuUna alata, in the same position as that given in Fig. 3 of Plate VII,, but more elongated, 

 and turned mouth upwards. 



Fig. 2. A view of the main chymiferous cavity, to show its connection with the radiating tubes, the vertical funnel, 

 and the tentacular apparatus. 



Fig. 3. A highly magnified view of the vertical funnel and the bulb of the eye-speck, with the base of the radiating 

 tubes. 



Fig. 4. The base of the tentacular apparatus in its connection with the walls of the mouth ; seen in profile. 



Fig. 5. A similar view, the specimen, however, placed obliquely, to show the two parallel edges of the mouth. 



Fig. 6. A view of the mouth from below, with the chymiferous tubes following its edge between the fissure of the 

 mouth and the tentacular apparatus, and anastomosing with the chymiferous tube of the auricle. 



Fig. 7. An enlarged view from above, corresponding to Fig. 7 of Plate VI. 



