US PROCEEDINGS OF THE ACADEMY OF [1879. 



ganglia were of oval form, connected by a very short commissure ; 

 the gastroesophageal oblong, about one-eighth the size of the 

 last, short stalked, developed on the side of the nerve ; with a 

 sing-le la rare and several smnll cells. 



The eye. showed a yellow lens and deep black pigment. The 

 otocysts visible as chalk-white spots under the loop in the usual 

 position, with about one hundred otoconia of the ordinary kind. 

 There were sparingly scattered calcified spiculae, 0.25-0.30 mm. 

 long, in the broad and rather thick leaves of the rhinophoria, set 

 perpendicularly or obliquely on the free margin of the leaves. 

 The skin was profusely furnished with large and small rod-shaped 

 spiculae, mostly much calcified ; in the axes of the granules of the 

 back were bundles of perpendicular spiculae as usual. In the in- 

 terstitial connective tissue a very few large spicules. 



The oral tube was wide (1.0-2.5 mm. long). The bulbus pha- 

 ryngeus of the usual form, about 1.3-2.25 mm. long, 1.2-2.0 mm. 

 broad, and 1.0-1.75 high. The radula also projected 0.3-0.75 mm. 

 from the posterior part of the under side of the bulbus. The 

 true mouth of triangular form, the point upwards. The lip-plate 

 was deep horn-yellow, narrow at the upper end and broader down- 

 ward at the lowest square part about 0.66 mm. broad ; it is com- 

 posed of densely set hooks^ cleft at the point and rising to the 

 height of about 0.033 mm. (figs. 9, 10). The tongue broad and 

 flat; in the five individuals examined, furnished with twenty-six, 

 twenty-seven, thirty-six, thirty, and fifteen rows of teeth ; further 

 backwards thirty-three, thirty-four, twentj'-eight, tliirty-six, and 

 thirtj^-two rows developed, and four immature rows ; the total 

 number of rows sixty-three, sixty-five, sixty-eight, seventy, and 

 fifty-one. 1 The basal plate of the teeth rather broad (fig. 16), the 

 hook standing nearly perpendicular on it. The median tooth 

 (figs. 11a, 12a, 13) broader on the posterior margin ; the cutting 

 edge of the recurved hook with three to four denticles on each 

 side. The lateral plates 2 in two individuals number only twenty- 

 two to twenty three; in three others twenty-five to twenty-six on 

 the hind part of the tongue, and further backwards twenty-eight 

 to twenty-nine; the three to four foremost rows were always very 



1 According to Alder and Hancock the number of rows is sixty-eight. 

 I found the lowest number in the small individual from Kiel. 



2 The numher was according to Alder and Hancock tw 7 enty-two, and to 

 Meyer and Moebius eighteen. 



