38 AET. 1. — CHAELES ELIOT : 



was black with pale yellowish longitudinal lines : the head shield 

 and foot were dark and purplish, margined with yellow. The 

 coloured drawing corresponds with this description but the pre- 

 served specimens have become much paler. They are flattish 

 and of an elegant shape, a large one being 50 mm. long and 22 

 mm. broad. 



The caruncle is not much developed. At most it can be 

 said that there are two small knobs under the rhinophores but 

 even these are not clear in all specimens, nor are any papillae 

 visible. The anterior margin of the foot is produced into sharp 

 angulate processes on either side. The transverse branchiae are 

 thin and as preserved white ; they are about 40 in number but 

 between the principal leaflets are other small ones. The side 

 lamella? consist of 4-5 thick longitudinal strips ; those in the 

 middle run continuously from the branchiae to the tail, but the 

 innermost and outermost lamellae are often broken up into dis- 

 connected projections. All the side lamella? contain thick and 

 conspicuous hepatic diverticula and the cnidopores along the 

 mantle edge are also distinct. On the posterior half of the sole 

 is an inconspicuous furrow. 



The jaws bear about 15 rows of denticles. In two speci- 

 mens which were dissected the radula consists of 46 and 48 rows 

 respectively and in both these were about 50 laterals on either 

 side of the central tooth. This tooth is fairly broad and bears 

 7-8 denticles on either side of the median cusp, besides one or 

 two on the sides of the cusp itself. The first lateral is rather 

 clumsy in shape : it bears a ridge and 3-5 denticles. The second 

 lateral bears 3-4 denticles, and the next thirty five bear 1-2 

 denticles, rarely 3. The 10-15 outermost are quite smooth. 



The naturalist who wrote the notes on the living animals 

 regarded them as P. compta Bergh, described from a single 

 specimen captured at Nagasaki in 1876. This habitat makes the 

 identity extremely probable but the present specimens do not 

 agree in all respects with Bergh's description, (1) P. compta has 

 only a single side lamella, whereas all the present specimens 

 have 4-5. (2) It has 15 papilla? of various shapes on the head 



