54 PROCEEDINGS OF THE ACADEMY OF [1880. 



The length was 32.0 mm., by a breadth of 19.0 mm., and a height of 

 13.0 mm, ; the breadth of the foot 12.5 mm., of the mantle-brim 3.0 

 mm. ; the height of the rhinophoria 3.0 mm., of the branchial leaves 

 2.5 mm. ; the length of the genital opening 2.25 mm. 



The form was elongate-oval, somewhat larger than that of the Lam. 

 hilamellata. The papillae of the back relatively smaller and more 

 rounded than in that animal. The openings of the rhinophor-holes 

 an oblique oval slit ; the margins plain ; several (six to eight) larger 

 papilliB (of about 1.0 mm. in height) in the immediate vicinity of the 

 holes ; the club of the rhinophoria with about thirty leaves. The 

 branchia with about ten leaves. The anal papilla low, with a stellate 

 aperture ; the renal orifice as usual ; the interbranchial space crowded 

 with rather pointed and high papillae. The head and tentacles as in 

 allied forms. The genital papilla of oval form, with a large, longitu- 

 dinal, crescentic slit. The rather broad foot with the usual anterior 

 marginal furrow. The peritoneum colorless, without spicula. 



The central nervous system more flattened than in allied forms ; 

 the cerebro- visceral ganglia reniform, a little broader in the anterior 

 part ; the pedal ganglia less flattened than the former, larger than the 

 visceral ones, of oval form, on the outside of the cerebro-visceral. The 

 proximal olfactory ganglia a little smaller than the buccal ones, bulbi- 

 form ; distal ganglia could not be found. The commissure not broad, 

 not short. The buccal ganglia of oval form, closely connected ; the 

 gastro-oesophageal roundish, rather long-stalked, in size about one- 

 sixth of the former, with one large cell and several (three or four) 

 smaller ones. 



The nervi optici rather long; the eyes with yellowish lens and 

 black pigment. The otocysts in the usual place, filled with otokonia 

 of the usual kind. The leaves of the club of the rhinophoria very 

 richly furnished with thick (diameter, 0.04 mm.) and long spicula, 

 more or less calcareous, and very often giving off a thick twig of 

 greater or less length (PI, V, fig. 12) ; for the most part set perpen- 

 dicularly or obliquely on the free margin of the leaves. The axes of 

 the organs and the short stalk stuffed with strong and very much cal- 

 cified spicules. In the skin of the back a mass of spicula of the same 

 kind (PI. IV, fig. 13) as above, or still more hardened ; the papillie of 

 the back solidified in the usual way (PI. V, fig. 11). In the interstitial 

 tissue fewer and smaller spicules. 



The oral tube rather short, wide. The bulbus pharyngeus of usual 

 form, about 5.5 mm, long by a height of 4.5 ram., (and at the upper 



