CRYPTOPLAX. 55 



the same position and to the same numbers as in Cryptoplax larvce- 

 formis and Cryptoplax striatus. (Haddon.) 



Port Adelaide (Eve.) and Port Nolle (Coppinger) ; Straits of 

 Macassar (Belcher.) 



Chitonellus larvceformis REEVE, (not of Burrow or Blainv.), 

 Conch. Icon., f. 3, 1847. Chiton (Chitonellus) burrowi SMITH, Zool. 

 Coll. H. M. S. < Alert/ p. 85, 1884. Cryptoplax burrowi HADDON, 

 ' Challenger' Polyplac., p. 42, t. 3, f. lla-llm. 



The gill-rows are very short, occupying less than a third the total 

 length, and there are 22 branchiae on each side. 



C. OCULATUS Quoy & Gaimard. PI. 9, figs. 1, 2, 3, 4, 5. 



A chiton with the body small, equally hairy, roseate, and 

 encircled with two black bands; valves glaucous, longitudinally 

 furrowed, the front three ovate, encircled by black and white hairs. 



A small species which is separated from C. fasciatus, as well as 

 from the two indicated by Lamarck, by its less cyclindrical form, 

 less obtuse extremities and greater flatness ; by having the body 

 covered with longer bristles and more crowded than in the above- 

 mentioned species; finally it differs in having the anterior three 

 valves oval, sea-green, surrounded by a circle of black bristles and 

 another, outside of that, of white ones ; giving the appearance of eyes 

 to these valves. The other valves are narrower, separated, claw- 

 shaped, and red-brown colored. All except the first are parallel- 

 grooved longitudinally, with a smooth triangle in the middle. 



It is probable that the plates of insertion are the same as in Ch. 

 fasciatus, but we have not examined them in the single individual 

 in our possession. The color is reddish, with two black transverse 

 bands, confluent on the back. The ventral surface is yellowish. 

 The mouth is encircled by a oval, fringed veil. The branchiae 

 occupy a little less than the posterior third of the body ; there are 

 20 lamellae on each side. 



Length 2 inches, 6 lines ; circumference 1 inch, 5 lines. ( Q. & 

 G.) 



f New Guinea or Vanikoro (Q. & G.) ; Samboangan, Philippines 

 in 10 fms. (Challenger) ; Friendly Is. (Brit. Mus. Coll.) 



Chiton oculatus Q. & G., Voy. Astrol., Zool. iii, p. 410, t. 73, f. 

 37, 38, (1834). Chitonellus oculatus DH. in Lam. An. s. Vert., vii, 

 p. 482 (1836). Cryptoplax oculatus HADDON, Challenger Polyplac. 

 p. 41, t. 1, f. 10; t. 3, f, 10a-10m. Chitonellus fasciatus REEVE, 



