51 



the narrow plates. The great dental plates are pale translucent 

 brown, and each has live prominent teeth of great strength. 

 The plate in front has two teeth, and the anterior plate one tooth. 

 Two prominent papillae occur on the anterior edge of the lower 

 lip, but no mandibles were present in either specimen. 



The granular condition of the borders of the anterior horny 

 plates, so well seen in British examples, is likewise present, 

 though less distinct both in these and in the opaque areas 

 exterior to the great dental plates. 



The feet are not so prominent as in the preceding species, 

 the posterior lobe being less conspicuous. The anterior feet 

 have winged bristles dorsally and jointed hooks interiorly. The 

 former have the tip curved on the shaft — with broad wings and a 

 short tapering tip. The hooks (Plate iv. fig. 22) have the long 

 shaft slightlv curved backward at its distal end and bevelled for 

 the basal process of the terminal piece — which tapers to a 

 crown with a main fang aud several minute teeth above it, and 

 with guards or wings which come from the end of the shaft. 



The first foot has a winged bristle or two, a long simple hook 

 and two jointed hooks. At the fifth and sixth foot only one 

 jointed hook occurs, but they evidently vary as in the 7th and 

 (Sth two winged bristles with tapering tips occur, then three 

 jointed hooks, and ventrally a single smaller winged bristle. 

 The latter disappears in the 12th, 13th and subsequent feet, the 

 14th having only a single simple hook.. The tapering tip of 

 the bristle becomes shorter and the wings broader at the base. 



The bristles by-and-by disappear, and the hooks remain 

 simple (Plate IV. fig. 23) the shaft having a prominent curve at 

 its stoutest or distal region, then narrowing to a crown which 

 has a main fang and a series of small teeth above it. Moreover 

 two small teeth occur on the distal edge of the great fang. 



The description of Liniibriconcrcis cavifrotis by Grube is 

 somewhat imperfect, but it would seem to refer to the same 

 form, though none of the present examples showed a dorsal 

 groove on the head, which it may be remarked, also occurs in 

 certain specimens of Liiinbi icoiifivis gracilis, Ehlers. The latter 

 seems to be a closely allied if not identical form — first found 

 by Ehlers at F'iume in the Gulf of Quarnero in the Adriatic, 

 but which is now known to occur at Madeira and on British 

 shores, so thai its distribution is very wide and ma}^ yet embrace 

 South Africa. Grube's examples came from Chalk Bav. 



Young Examples. 



Certain young forms procured on various dates, show the 

 foil owing differences from the ioregoing{LiimbricoiiiTcis!^rin His). 

 Thev occurred in the tissue of a sponge inside a fiagmeiilary 

 Troiiiiis. 



I) 2 



