MINUTE ANATOMY OF LIMNOCODIUM. 549 



8. R. T. GuNTHEK. — "The Fresh-water Medusa of Lake Tauganyika," 'Ann. 

 Mag. Nat. Hist.,' ser. 6, xi, 1893. 

 A complete bibliography of Limnocodium Sowerbyi up to 1890 will 

 06 found in No. 7 in the above list. 



EXPLANATION OF PLATE 40, 



Illustrating Mr. R. T. Giinther's paper, "Some Further 

 Contributions to our Knowledge of the Minute Anatomy 

 of Limnocodium." 



Reference Letters, 

 c. c. Circular canal, circ. m. Circular muscle, cort. c. Cortical cells of 

 sense-organ, ed. Ectoderm, end. Eudoderm. m. Mouth, med. c. Medul- 

 lary cells of sense-organ. »«?«. Manubrium. »w. Mesogloea. ?^e^. Nettle-ring. 

 n. r. Nerve-ring. r. c. Radial canal, s. o. Velar sense-organ, te. Tentacle. 

 V. Velum. 



Fig. 1. — Meridional section through an entire Limnocodium, in which tlie 

 velum is strongly contracted. The ectoderm {ect.) is represented by a single 

 line ; the mesogloea (ms.) is shaded ; the eudoderm {end.) lining the gastric 

 cavity is represented by a double contour, x 15. 



Fig. 2. — Radial section of margin of umbrella, showing the circular caual 

 (c. c.) with a radial canal (r. c), cut longitudinally, opening into it. The 

 basal portion of a radial tentacle {te.) and of the velum {v.) are also re- 

 presented. 



Fig. 3. — A similar section to Fig. 2, but not passing through a radial canal 

 and tentacle. In this section a velar sense-organ {s. o.) in its chamber has 

 been cut through. 



Fig. 4. — Longitudinal vertical section of a portion of the velum, showing 

 several of the chambers of the velar sense-organs cut across. Note the thin 

 pavement epithelium lining these chambers. 



Figs. 5«, ^, ff. — Transverse sections of tentacles, showing lumen. 5« is 

 cut diagonally, and shows the circular muscles {circ. m.) at the two ends as 

 transverse stripes. 



Fig. 6. — Five drawings of sections of velar sense bulbs, ff is a longitu- 

 dinal section of quite a young stage which has only just become separated 

 from the endoderm. b and c are transverse, d and e longitudinal sections of 

 mature sense bulbs, e shows the stalk of attachment. 



