1906.] OP SOUTHERN INDIA AND CEYLON. 689 



Several of these twenty-seven species are probably mere colour 

 varieties. It is, for instance, clear that in both the tropical 

 Pacific and tropical Atlantic there is found a greenish Elysia in 

 which one or more coloured borders and spots of variovis colours 

 may be present or absent. More distinct are the forms with a 

 coloration offering vivid contrasts and often brilliant, such as 

 E. ccerulea, E. picta, and E. haingsisiana. Other good characters 

 may perhaps be found in the shape and denticulation of the teeth, 

 and in the conformation of the wings, tentacles, and pericardial 

 prominence. 



Elysia gkandifolia * Kelaart. (Plate XLYI. fig. 4.) 

 (Kelaart, 1. c. II. p. 493.) 



Two specimens preserved with the rest of Kelaart's molluscs 

 are probably referable to this form, but have no label. They are 

 of a uniform yellowish grey, much contorted, and so decayed and 

 fragile that it is hardly possible to unroll them without breaking 

 them. They are about 30 mm. long and 20 mm. broad. The 

 wings are ample and the tail long and pointed. The rhinophores 

 are well developed and auriculate. The mouth is ventral. The 

 sole is not in any way marked off from the under side of the wings. 

 Though the specimens are in such bad condition, it seems clear in 

 both of them that the pericardial prominence is not a simple 

 round lump, but that the pericardium or some accessory organ is 

 prolonged posteriorly for about 10 mm. The projection is not 

 even, but constricted several times. From either side of it spring 

 about seven main trunks of prominent vein-like reticulations. 

 Each is subdivided many times and the whole upper surface of 

 wings is covered with an elaborate raised network. 



The radula consists of 8 teeth in the ascending series, 1 2 in the 

 descending, and about 20 in the heap. They are of the form 

 usual in the genus, hollowed in the back and rather straight in 

 outline. Under the highest power the lower edge appears 

 minutely serrulate, but this serrulation is not visible under lower 

 powers. 



Kelaart's figure agrees fairly well with the specimens, but 

 the head, as drawn, is rather small. The coloration resembles 

 Bergh's figure of Elysia ornata (Siboga., pi. ii. fig. 20) and my 

 figures of Elysia marginata (Proc. Zool. Soc. 1904, ii. pi. xvi. 

 figs. 7, 8), but neither of these has the pointed tail and the 

 elongate pericardial prominence. The latter feature appears in 

 E. ciuhia Ehot (Proc. Zool. Soc. 1. c. p. 297). 



Elysia c^srulea Kelaart. (Plate XLIII. fig. 7.) 



(Kelaart, 1. c. II. p. 493. Cf. Bergh on Elysia ? Uneola,ta, 

 in Siboga-Expeditie, Opisthobranchia, pp. 85-87.) 

 This can hardly be anything but the Elysia lineolata of Bergh, 



* By an error Bergh has registered this animal in his lists as JEJ. grancliflora., but 

 Kelaart calls it g rand i folia both in MS. and in print. 



46* 



