42 PROCEEDINGS OP THE ACADEMY OP [1880. 



with about thirty leaves (on each side). The back all over minutely 

 and densely villous (fig. 3). The margin of the rather wide (5.0 mm.), 

 roundish branchial aperture like the margin of the rhinophor-holes, 

 prominent, finely crenulate ; the branchial leaves (retracted) six in 

 number, very strong, tri- or quadripinnate. The anus strong, about 1 5 

 mm. high, cylindrical, closing the branchial ring posteriorly ; the renal 

 pore as usual. The edge of the mantle rather thick, projecting about 

 2.0 mm. from the body ; the sides low. The genital opening as 

 usual, with two distinct apertures at the bottom. The foot strong, 

 broad, somewhat narrower towards both ends ; in the anterior margin 

 a strong furrow, towards the median line deeper and forming two lips ; 

 the superior broader and divided in the median line. 



The cerebro-visceral ganglia kidney-shaped, the visceral larger than 

 the cerebral ; the pedal of roundish contour, scarcely larger than the 

 visceral. The buccal ganglia of oval form, connected by a short 

 commissure ; the gastro-oesophageal roundish, short-stalked, in size 

 about one-fifth of the former, with one very large and one large cell. 



The eyes short-stalked, with black pigment and yellowish lens. The 

 otocysts scarcely smaller than the eyes, overcrowded with otokonia of 

 the usual kind. The leaves of the rhinophoria strengthened with long, 

 perpendicular spicula, calcified at the surface. The tentacula with a 

 mass of shorter, but otherwise similar spicules, lying irregularly. 

 The villi of the back closely set with perpendicular spicula (lig. 3). 

 The anal papilla with long, perpendicular spicules ; the stalk of the 

 branchial leaves with many shorter spicula, irregularly situated ; in the 

 leaves themselves were no spicules. In the interstitial connective 

 tissue large spicules were seen rather sparsely. 



The oral tube was about 1.5 mm. long, wide, with strong longitudi- 

 nal folds. The bulbus pharyngeus only about 4.0 mm. long, by a 

 htvight of 2.0 mm., and a breadth of 4.0 mm. ; the rasp-sheath very 

 prominent on the hinder part of the under side of the bulbus ; the 

 inner mouth with a yellowish, not thin, cuticula. The tongue with 

 nine rows of teeth, in the rasp-sheath also eleven rows of developed 

 and two of not quite developed teeth, the total number thus being 

 twenty-two. In the posterior rows of the tongue the number of plates 

 was twenty-eight or twenty-nine, on each side, and seemed in the suc- 

 ceeding rows not to surpass thirty. The color of the teeth horn- 

 yellowish ; the height of the outermost 0.06 to 0.08 mm., the height 

 rising to about 0.18 mm. The form of the teeth as usual; the wing 

 rather narrow ; the innermost (fig. 5aa, h) not very different from the 



