152 CEYLON PEAEL OYSTER REPORT 



Liriope, Lesson, 1843 ; ex Maas, 1893. 

 Geryoniidse, with four radial canals and with four or eight tentacles. 



Liriope tetraphylla (Chamisso et Eysenhardt), 1820. 



Geryonia tetraphylla, Chamisso et Eysenhardt (1820, p. 357, plate xxvii.). 



Liriantha tetraphylla, Haeckel (1879). 



Liriope tetraphylla, Vanhoffen (1902, p. 82, taf. x.); Browne (1904, p. 738, pi. liv., fig. 3). 



The collection contains 19 specimens; only a few are in fairly good condition 

 There are a few early and intermediate stages, but their condition is not satisfactory 

 for a description. The largest specimens are similar to a figure given by Vanhoffen. 



When I wrote the ' Report on the Hydromedusse of the Maldive Islands ' I was not 

 quite certain about the correctness of the identification of a Liriope which I called 

 L. tetraphylla (1904, plate liv.). I have again examined this specimen (there was 

 only one in that collection) and have come to the conclusion that it must be regarded 

 as Liriope tetraphylla. I have failed to find a character by which it could be 

 specifically separated from those in the collection from Ceylon. 



Notes on the Largest Specimens. The shape of the umbrella is similar to that in 

 the figure given by Vanhoffen, and is not so thick or so rounded as in that figured 

 by me in the Maldive Report. The peduncle of the stomach is long and tapering ; 

 its length in the largest specimen is about 13 millims. Along the peduncle run four 

 interradial, longitudinal muscle bands, which bifurcate at the base of the peduncle 

 and the two ends curve outwards. The stomach is large and sac-shaped. The 

 gonads vary very slightly in shape. They resemble Vanhoffen's figure, and 

 measure 7 millims. in width and 5 millims. in length. The space between the gonads 

 (measured from the upper margins) is about 2 millims. The radial canals are fairly 

 broad, and that part of the canal between the gonad and the circular canal is much 

 broader than as figured by Vanhoffen and myself. Most of the specimens have 

 three centripetal canals in each quadrant. They are broader and less tapering than 

 those shown in the figures mentioned above. One of the specimens has only one or 

 two centripetal canals in each quadrant. A few of the specimens have eight tentacles, 

 but the majority have only the four perradial tentacles. 



Size : The largest specimen measures 15 millims. in width and 7 millims. in height. 



Locality : Cheval Paar, off Mutwal Island and Chilaw Paar, various dates in 

 March and November ; Galle Bay, in June and July. 



Distribution : Atlantic and Indian Oceans. 



Order: NARCOMEDUS.E. 

 Family: iEGINID^E, Gegenbaur, 1856; ex Maas, 1904. 

 Solmundella, Haeckel, 1879; ex Maas, 1904. 

 iEginidae with two tentacles and with a stomach having eight pouches. 



