LIMNOCNIDA TANGANICdL 
105 
EXPLANATION OF PLATE 15, 
Illustrating Mr. C. L. Bouleuger’s paper “ On Some Points 
in the Anatomy and Bud-Formation of Limnocnida 
tanganicse.” 
List of Reference Letters. 
circ. c. Circular canal, ect. Ectoderm, end. Endoderm. end. 1. Endo- 
derm lamella, end. p. Perradial pouch of endoderm in the medusa-hud. 
ent. Ectoderm of the entocodon. ex. ect. Ectoderm of the exumbrella. 
/. b. Food-ball in a nutritive cell of the endoderm. gl. c. Gland-cell. 
gobl. c. Mucus-secreting goblet-cell of the oral endoderm. int. end. 
Interradial constriction of the double- walled cup of endoderm in the 
young medusa-bud. man. Manubrium. med. Medusa-bud. mes. 
Mesogloea. nem. Stinging-cell in the nettle-ring, nem. 1 Stinging-cell 
migrating through the tentacular ectoderm, net. Nettle-ring, nr. 1 nr.' 2 
The two divisions of the double nerve-ring, tent . l tent ? Sections of a 
tentacle, tent. per. Perradial tentacles of the medusa-bud. v el. velum. 
Fig. 1. — Radial section through the periphery of Limnocnida 
passing through the manubrium (man.) and the base of a large tentacle 
(tent. 1 ). The distal part of the same tentacle is cut transversely at tent. 2 
The manubrium bears two medusa-buds on the middle region (med. b .) ; 
the oral region is coiled up towards the periphery. The umbrella is 
considerably shrunk. The ectoderm (ect.) is more deeply shaded than 
the mesogloea (mes.) and the endoderm (end.) 
Fig. 2.— Radial longitudinal section of the nettle-ring (net.), and the 
basal embedded region of a large tentacle. The section does not quite 
pass through the centre of the latter, and therefore shows only part of 
the tentacle-cavity. The ectoderm on the exumbrellar side of the 
tentacle consists of large, low cells, with stinging-cells (nem?) migrating 
from the edge of the nettle-ring. 
Fig. 3. — Radial section through the velar edge of the nettle-ring 
showing the double nerve-ring (nr. 1 and nr?) near the base of the 
velum (vel.) 
Fig. 4. — Longitudinal section through the oral region of the manu- 
brium some distance from the mouth. The endoderm consists of finely 
granular cells (end.), and goblet-cells (gobl. c.) ; the latter have clear 
contents, and stain deeply in this position. 
Fig. 5. — A similar section, but through the distal extremity of the 
oral region. The goblet-cells have elaborated large quantities of mucin. 
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