MEM. M. C. Z., IX. No. 3. — ACALEPHS, POLYPS. 51 
42. Ephyra with umbrella (wr) thrown back, leaving the manubrium (man) projecting outward. ga. c. Gastric 
chamber (in this early stage only a part of the stomach). ocy. Otocyst. ¢b. Tube to the otocyst from the 
gastric chamber. 4.1 Tube from the gastrie chamber to the region from which the tentacles later arise. 
43. Ephyra of about the same age as the last from the aboval side. ga. c. Gastric chamber. or. Mouth seen 
through the body walls. ¢4.1 Tentacular tube. ¢b.? Tube to the otocyst. 
44. An older Ephyra seen from the oral side. ga. c. Gastric chamber. ocy. Otocyst. or. Mouth. ¢b.1 Tentac- 
ular tube. ¢.2 Ocular tube. wbr. Umbrella. 
45. A sense octant (from oral side) of an Ephyra of about this age. ocy. Otoeyst. ocy. s. Stalk upon which 
the otocyst is carried. ¢b.1 Chymiferous tube from gastric chamber to the region of the bell margin from 
which the tentacles arise. ¢b.2 Tube to the peduncle of the otocyst.  ¢b.° Blindly ending tube. 4.6 En- 
largement of ocular tube. . 
46. Quadrant of an Ephyra (oral view), older than the last in which the clusters of tentacles are formed. can. 
erc. Circular canal. ga. Stomach. Jab. Lips. oa. Ovary. ocy. Otocyst. or. Mouth. ta-ta.® Tentacles. 
tb-th .6 Chymiferous tubes. vel. Velum. § &! Intervals of muscular lower floor separating tubes. The 
circular muscles are seen at ©! 
46.1 Ovarian opening. oa. Ovary. y. Portion of bell-wall near ovary. a. Rim of opening. @. Phacellen (sex- 
ual filaments). ¢.’ Phacellen, seen through opening. 
47. Profile view of a young medusa, older than the Ephyra strictly so called, with bell expanded. ocy. Otocyst. 
or. Mouth. or. ta. Oral tentacles. whr. Upper side of the umbrella. 
48. The same with bell-walls contracted. or. ta. Oral tentacles. 
49, Oral view of a young medusa older than the Ephyra, but without tentacles. 
