136 CEYLON PEARL OYSTER REPORT. 



Proboscidactyla minima, n. sp. Plate II., fig. 3. 



Description. Umbrella fairly thin and probably hemispherical in shape. Stomach 

 divided into four longitudinal lobes. Mouth with a sinuous margin. Four radial 

 canals with lateral branches. Gonads upon the lobes of the stomach. Tentacles 

 short, about 16 to 20, with globular basal bulbs. 



Size : Umbrella about 1 millim. in diameter. 



Locality : Marichchukaddi, on the Gulf of Manaar, in February. 



Notes. There are 12 specimens, but their condition does not permit the production 

 of a figure. I was unable to trace out the branching of the radial canal system, 

 owing to the umbrella of all the specimens being more or less contracted, and to 

 their fragile condition. The stomach is divided longitudinally into four lateral lobes 

 and appears cross-shaped in transverse section. The gonads form lateral swellings 

 upon the sides of the lobes, which do not extend along the top of the umbrella. The 

 tentacles (fig. 3) are very short, about 0*25 millim. in length, and have a globular 

 basal bulb situated in the jelly of the umbrella. On the ex-umbrella, not far from 

 the margin, there are circular clusters of nematocysts, one between every two 

 tentacles. The velum is very narrow. A few of the specimens are about 

 075 millim. in diameter and have 10 to 12 tentacles. Others, a little older, have 

 14 to 16 tentacles. One specimen has 18 tentacles. A full-grown adult has probably 

 20 tentacles. This species may be distinguished by the smallness of its size and the 

 position of the gonads on the stomach. 



Order: LEPTOMEDUS^. 



Family: THAUMANTIIDiE, Gegenbaur, 1856, 



Laodice, Lesson, 1843. 



Laodice indica, n. sp. Plate I., fig. 5 ; Plate IV., figs. 7 to 11. 



Description. Umbrella slightly curved, about two to four times as broad as high, 

 with moderately thick walls. Stomach cross-shaped, fairly large. Mouth with four 

 short lips, having a slightly folded margin. Gonads extending from the stomach to 

 about half-way or close to the margin of the umbrella, forming a large hollow sac 

 upon each of the four radial canals. Tentacles about 60 to 80, with blackish basal 

 bulbs, and without spurs. A large black ocellus upon the inner side of nearly all the 

 basal bulbs. A single cordylus between every two tentacles. Cirri present. 



Size : Umbrella up to 6 millims. in diameter. 



Locality : Off Mutwal Island, West Coast of Ceylon, 12 specimens on March 19 ; 

 and Galle, 3 specimens, on July 15. 



Notes. The collection contains 1 5 specimens which are about 5 millims. to 6 millims. 

 in diameter and about the same age. The distance to which the gonads extend from 

 the stomach along the radial canals varies in different specimens. Some have the 



