1S80.J NATURAL SCIENCES OF PHILADELPHIA. 73 



and by me ought to be called by that name. To the same is without 

 doubt to be referred the second variety (/9) of the D. muricata 

 (Miiller, Sars) of Lov^n (the first being the D. Lov'ni of Alder). 



Of this form, and under that name, I have had two well conserved 

 specimens for examination, kindly sent me by Mr. Friele, of Bergen, 

 and caught in the neighborhood of that place. 



The individuals (preserved in spirits) were of light yellowish color.' 

 The length 9-10 mm. by a breadth of 5-6.0 and a height of nearly 

 8.0 mm. : the breadth of the foot reaching 3.5 ram. ; the height of the 

 rhinophoria 1.5, of the branchial leaves 1.0 mm. The form of the 

 animal as usual ; the warts of the back not large, mostly truncate, 

 clavate. The openings for the rhinophoria as usual, with two tubercles 

 before them, or one on each side; the club with about fifteen to twenty 

 leaves.- The branchial leaves about twelve to fourteen, as far as could 

 be determined ;3 the space inclosed by the gill covered with the usual 

 tubercles ; the anus presenting the ordinary features. The head rather 

 large, the side parts adhering to the foot throughout their whole length. 

 The genital groove with three openings j a foremost round, a median 

 spalt-formed, and a posterior large and round. 



Both individuals were dissected ; the peritoneum was colorless. 



In the central nervous system the cerebro-visceral ganglia appeared 

 rather short, reniform ; the pedal ones of roundish form, somewhat 

 larger than either of the former ; the commissures rather short. The 

 olfactory ganglion short-stalked, nearly spherical, situated rather 

 posteriorly on the upper side of the cerebral ganglia, and nearly as 

 large as the buccal ones. The buccal ganglia of oval outline, con- 

 nected by a short commissure ; the gastro-oesophageal nearly spherical, 

 in size about one-quarter of the former,, short-stalked: a secondary 

 ganglion lying above the last on the oesophagus. 



The eyes not short-stalked ; with rich black pigment and yellow 

 lens. The otocysts a little smaller than the eyes, filled with otokonia 

 of the common kind. In the leaves of the rhinophoria rather few but 

 large spicula of the same kind as in the skin, more or less perpendicu- 

 lar on the free margin ; the axes of the club like the stalk still more 

 richly endowed with smaller and larger spicules. Under the glass the 



' According to Loven the color is yellowish; to Meyer and Moebius white 

 or yellowish-white the rhinophoria orange-colored. 



- According to Meyer and Moebius the club of the rhinophoria has but 

 nine or ten leaves. 



' Meyer and Moebius mention eight leaves as nearly constant. 

 6 



