122 PROCEEDINGS OF THE ACADEMY OF [1879. 



about one-eighth the size of the former, developed on one side of 

 its nerve with one very large and several smaller cells. 



The eye provided with black pigment, and a yellow lens. The 

 otocysts in their usual place, filled with ordinary otoconia. The 

 broad leaves of the rhinophoria with a rather large quantity of 

 spicula, generally set obliquely or perpendicularly on the free 

 margin. The spicula mostly rod-shaped, long, and much calcified. 

 These also occur abundantly in the skin of the back, often asso- 

 ciated in small groups. The tubercles of the back were stiffened 

 in the ordinary way, but there were very few spicules of the larger 

 kind in the interstitial tissue. 



The oral tube was about 2.5 mm. long, 1.8 mm. wide at the 

 posterior end, internally as usual ; the retractor muscles very 

 strong. The bulbus pharyngeus strong, about 3.0 mm. long, 2.5 

 mm. broad, and 2.1 mm. high. The sheath of the radula project- 

 ing about 1 mm., bent upwards. The lip-disk rather broad ; the lip- 

 plate broad, broadest below, yellow; the lateral parts with several 

 transverse folds; the elements (fig. 7, 8) scarcely different from 

 those of the typical species, or perhaps a little less crooked, of a 

 height of about 0.05 mm.; the mouth, of triangular form, quite 

 as in the C. repanda. The tongue of usual form with about thirty- 

 three rows of plates ; further back forty-eight developed, and four 

 immature rows; the total number of them eighty-five; the first 

 ten rows of the tongue more or less incomplete. 1 The number of 

 lateral plates in the hinder row of the tongue thirty-three, the 

 number scarcely increasing in the sheath. The plates of yellowish 

 color; the breadth of the oldest plate (in the hinder part) 0.045 

 mm., the breadth of these plates increasing to 0.06 mm.; the 

 height of the outermost plates about 0.04, and the height of the 

 lateral plates increasing to about 0.12 mm. The plates of nearly 

 the same form as in the last species. The median plate a little 

 emarginated in the posterior margin; the short recurved hook 

 usually with 3-4 denticles on each side of the point (fig. 9, 10a), 

 sometimes this point was replaced by two single or bifid larger 

 denticles (fig. 9). The first lateral plate (fig. 1066) with 5-6 den- 

 ticles at the inside, and with 6-7 at the outside of the hook. 

 Through the 4-6 following plates (fig. 10) the size of the plates 



1 The progression was as follows, 611, 413, 617, 10112, 

 20118, 22119, etc. 



