OPISTHOBRANCHIATE MOLLUSCA. 351 



the margin of the mantle foramen. The latter is large and oval, measuring 

 5'5 millims. by 3'5 millims. The shell (Plate IV., figs. 11 and 12) is large, strong, 

 opaque and deep, with well-marked growth ridges and overhanging adnate callus 

 hood ; it measures 9 '5 millims. by 7 millims. Judging by the size of the shell and 

 the way in which it has been forced out of the mantle cavity, the whole animal is 

 very much contracted. 



The radula (Plate IV., fig. 9) is of an orange-yellow colour and contains 34 rows of 

 13-1-13 teeth, the 4 outermost being imperfect. 



This specimen agrees very closely with A. elongata from the Sandwich Islands, 

 the very large mantle foramen and large strong shell with well marked callus being 

 very characteristic. 



Besides the above there are in the collection 2 specimens from Chilaw Paar which 

 are most probably young examples of A. elongata. They resemble the Jokkenpiddi 

 specimen in form, but differ in being semi-transparent and colourless except for 

 a narrow black edge to the rhinophores, tentacles, front of foot, mantle foramen and 

 posterior part of pleuropodia. The shell is membranous with a very delicate white 

 calcareous layer which has mostly disappeared. 



The radula has only 27 rows, the teeth being as in the larger specimen; the lengths 

 of the two Chilaw specimens are 1'3 millims. and 1*1 millims. respectively. 



Aplysia intermedia, n. sp. Plate IV., fig. 8. 



There is a single well-preserved specimen ol Aplysia from S. Cheval Paar which 

 does not fit in with any of the published descriptions. It combines the opposite 

 characters of a large mantle foramen and long free pleuropodia. 



Length of the preserved specimen 1'8 centirns. , width 1'4 centims. , height 1 centim., 

 length of foot 1'6 centims., distance from fusion of pleuropodia to end of foot 

 2 '4 millims., mantle pore 4 '2 5 millims. by 3 millims., length of mantle siphon 

 2 millims. Colour of living animal, green ; colour of spirit specimen, greyish ; general 

 effect made up of fine recticulating broken black lines of the usual Aplysia type, 

 following no regular plan ; mantle with black specks rather concentrically than radially 

 arranged. The mantle foramen has not a black edge. 



The tentacles are large, produced anteriorly into broad labial flaps. The shell is large 

 (l'l centims. long), thin and membranous ; calcareous layer only present as a few small 

 patches at the apex of the shell. 



The radula (Plate IV., fig. 8) consists of 30 rows of 16-1-16 teeth, the 3 outermost 

 being without hooks. The teeth resemble those of A. elongata in form. 



Phyllaplysia albomaculata, n. sp. Plate IV., figs. 13 to 16 ; Plate VI., fig. 6. 



I have thought it best to create new species for this and the two following forms, 

 rather than run the risk of identifying them incorrectly with any of the many vaguely 

 described species which are in existence. The single specimen of P. albomaculata was 



