CRYPTOFLAX. 57 



Length 105, breadth 24, thickness 19 mill, (alcoholic specimen.) 

 Viti Islands (A, Garrett !) ; Tonga Tabu, Friendly Is. (Q. & G.) ; 



KandavH, Fiji, (Challenger Exped.) , Dalaquete, Zebu, Philippines 



(Cuming.) 



Cryptoconchus larvmformis Blv. in Burrow, Elem. of Conch, p. 



190, 1815 (no description). — Chiton, larvceformis Burrow, /. c, p. 



191, t. 28, f. 2, 3, 4.— Blainv., Manuel de Mai., p. 603, t. 87, f. 6, 

 1825. — Cryj)toplax larvceformis Haddon, Challenger Polyplac, p. 37, 

 t. 3, f. 12. — Cryptopla.r larvaformis Blv., Diet. Sci. Nat. xii, p. 124, 

 1818. — Ads., Gen. Rec. Moll, i, p. 484. — Chiton chito7iellus Blaisv., 

 Diet. Sci. Nat. xxxvi, p. 550. — Chiton vermiformis Blainv., /. c, p. 

 553. — Chiton fasciatux QuOY & Gaimard, Voy. de I'Astrol., Zool. 

 iii, p. 408, t. 73, figs. 21-29. — Chilonellus fasciatus Desh. in Lam., 

 An. s. Vert, vii, p. 482.— Reeve, Conch. Syst., t. 135, f. 3,4; 

 Conch. Icon., f. 2.— Gould, U. S. Expl. Exped., p. 333, atlas, t. 28, 

 f. 429. — CryjAoplax fascicda Ads., Genera, t. 55, f. 6, 6a. — Chitonellus 

 kevis Reeve, Conch. Syst. ii, 1. 135, f. 2. — Chiton eruciformis Sowb. 

 Gen. Shells, t. 139, f. 5 (1820-1825.) 



Readily distinguished from C. burrowi by the form of the poste- 

 rior valve and the absence of a raised smooth dorsal band on the 

 valves. This latter feature seems to separate it also from C. oculutus, 

 in which, besides, the longitudinal grooves on the sides of the valves do 

 not converge forward. There is also a diflference in the profile of 

 the tail-valve, in the spicules surrounding the anterior valves, and 

 ill the size. 



On plate 11, fig. 31, 40-43, represent the largest specimen before 

 me. It was collected by Garrett at the Viti Is. Figures 32-34 were 

 also drawn from this specimen, fig. 34 representing a single pore- 

 bunch ; fig. 33 a square mill, from near the posterior valve, and fig, 

 32 a portion of the marginal row of spinelets showing the minute 

 spicules of the base below, the dark-colored spieules of the side of the 

 animal above. This example shows the 18 minute bunches of 

 white spinelets characteristic of the species, although the posterior 

 ones are very minute. Another specimen (fig. 35) is somewhat 

 diflferently marked, and lacks all pores or pore-bunches. As this 

 example is excellently preserved in spirit, and not wrinkled, the 

 absolute absence of pores can be aflarmed with confidence. I can 

 see no differences in the valves between this example and the Viti 

 Island specimens. Part of the dried specimens before me seem to 

 lack pore-bunches, but this cannot be determined with certainty. 



