PIXSBRY : ON Till: GENUS CRYPTOPLA.X. 153 



b. Valve viii longer than ii, and valves iv to viii about equal in size and of 

 nearly similar form ; a distinct band -like dorsal area developed on valves ii 

 to viii. 



c. Anterior three valves surrounded by a fringe of black within one of 

 white spicules ; valves v to viii moderately separated ; girdle densely 

 covered with rather long spicules. V. oculatus, Q. & G. 



c 1 . Anterior three valves iu contact, the rest more or less widely separated ; 

 posterior insertion- plate of valve viii vertical, rather long ; girdle 

 sparsely clothed with minute spicules, some larger ones scattered 

 among them. C. Gunnii, Rve. 



c 2 . Valves all in contact or nearly so, slightly wider and less coarsely 

 sculptured than in C. Gunnii; posterior insertion-plate of valve viii 

 short and thrown forward ; girdle densely clothed with long spicules. 



C. striatus, Lam. 



1. Cryptopi-ax Elioti, n.sp. PI. XIV, Figs. 1-11. 



Sub-cylindrical and vermiform, widest behind, gradually tapering 

 anteriorly ; pale buff -grey, with small and very sparsely scattered red, 

 or brick-red maculae, more profuse on the under side of the girdle ; 

 densely clothed with short, flattened spicules, which give the surface 

 a silvery gleam like some of the Aplacophora. Valves i and ii exposed 

 and contiguous ; iii and iv almost concealed, sunk in a groove ; the 

 next three very widely separated, also greatly reduced, but visible 

 through small round orifices ; valve viii minute and oblong. 



Anterior valve small, truncated-oblong, the tegmentum longer than 

 wide, eroded and sparsely punctate ; the articulamentum white, more 

 than double the length and breadth of the tegmentum, the posterior 

 angles produced backward, anterior margin having three notches ; 

 muscle-scars deep. Valve ii with the tegmentum touching that 

 of valve i, lozenge-shaped, tapering fore and back, faintly rugose ; 

 articulamentum sub-triangular, wide in front, narrower and bilobed 

 behind. Valve iii much smaller, separated from the preceding, 

 broadly sagillate, with small narrowly piriform tegmentum. Valve iv 

 similar to iii, but still smaller, rather widely separated from it ; both 

 of them being sunk in a groove and concealed by the surface spicules, 

 though not enclosed in the integument. Valve v separated from the 

 preceding by nearly one-fifth the total length of the animal, very 

 minute, similar to valve iv but shorter, the tegmentum oblong, with 

 distinctly raised dorsal area and slightly rugose latero-pleural tracts. 

 Valve vi still more widely separated from the preceding, and similar 

 to it. Valve vii somewhat less widely separated from vi, larger _ and 

 squarish, the tegmentum with a few longitudinal stria? at the sides. 

 Valve viii oblong, truncate, and emarginatc in front, rounded behind, 

 the articulamentum projecting beyond the tegmentum on all sides, 

 insertion-plate projecting laterally and backward ; sinus srnall and 

 shallow ; the tegmentum narrowly oblong, rounded behind, acuminate 

 in front, the mucro nearly posterior ; dorsal area smooth except for 

 some transverse wrinkles, tapering in front, latero-pleural tracts 

 sculptured longitudinally with a few coarse striae, somewhat granose 

 posteriorly. 



Girdle densely clothed with oblong scales, which have a silvery 

 gleam, are blunt at their free ends, and have one or two longitudinal 



