OPISTHOBKANCHIATE MOLLUSCA. 337 



Platydoris speciosa (Abr.). Plate II., figs. 8 to 12, and Plate III., fig. 10. 



The type of this species from Amhoyna is, like the preceding, preserved in the 

 British Museum, and has heen described by Abraham (7), but nothing is known of 

 the form of its radula or genital organs. A specimen of Platydoris from the Gulf 

 of Manaar appears to belong to this species. Its length is 57 centims., width 

 4 - 5 centims., width of foot, much contracted, 0*9 centim. The mantle is very wide, 

 covered above with closely-set, minute tubercles with radial spicules. The ground 

 colour of the specimen is an opaque muddy brownish -grey. The mantle is marked 

 above with collections of small, purplish-brown spots, irregularly placed over the 

 whole surface. 



The lower sides of the mantle are marked with large, purple-brown, circular 

 1 ilotches, with smaller ones on the side of the body. The rhinophore pores have their 

 margin slightly raised. The branchial pore is 6-lobed, stellate, tightly closed over 

 the retracted branchiae. The walls of the pore are moderately high. The branchiae 

 are 6 in number, compoundly pinnate surrounding the long tubular anus, the margin 

 of which is crenulated. 



The radula (Plate II., figs. 8 to 10 ; Plate III., fig. 10) contains 46 rows, with 

 about 58 teeth on either side of the naked rachis. The teeth are simple, hooked, 

 decreasing in size slightly towards the centre of the radula. Compared with those 

 of the previous species, they are somewhat smaller and much more slender. 



The penis (Plate II., figs. 11 and 12) is armed as usual with hooked discs, rather 

 large and closely set below, much smaller surrounding the glans, which bears a few 

 still smaller spines. The armature of the vagina, owing to an accident during 

 examination, could not be noted. 



This, or the preceding species, may perhaps prove to be identical with the Doris 

 formosa or Dons elliotti described by Alder and Hancock from Madras, but this 

 cannot be determined without an examination of specimens in their natural colours. 



Platydoris herdmani, n. sp. Plate II., figs. 13 to 17. 



A single specimen of this species was taken at Galle, and three others, without 

 recorded locality, are in the collection. Length 3 centims., width 1*4 centims., width 

 of foot, edges approximated, 0"4 centim., height 0'5 centim., length of foot 2'1 centims. 



The mantle is large, minutely tuberculate, with its edges thin and very much 

 frilled. Its centre is marked by a large, irregular, pale reddish-brown blotch, spotted 

 with darker, and breaking up into smaller spots towards the margins of the mantle. 



The extreme margin of the mantle is marked by a series of black sub- dermal spots, 

 equally visible from above and below. The under side is very faintly dotted with pale 

 brown, the margins of the foot being marked with darker brown. 



The ground colour is a waxy flesh colour. The texture of the body is stiff and 

 brittle, the spicules are numerous, small, slightly roughened, and arranged in dense, 

 closely-packed, stellate clusters. The branchial and rhinophoral pores are raised and 



2 x 



