84 PROCEEDINGS OF THE ACADEMY OP [IS79. 



place (under the region between the two extremities of the first 

 group of papilhe), contracted. The foot is strong, broader than 

 the back, the muzzle rather broad and produced into angles ante- 

 riorly ; their length about one-third of the breadth of the foot; 

 the groove of the anterior margin is continued along the margin 

 of the angles, the tail measuring about a third of the whole length 

 of the foot. 



The cerebro- visceral ganglia are rather short, not much larger 

 than the short pyriform pedal ganglia. 



The buccal ganglia are rounded, connected by a commissure 

 which is a little longer than the diameter of the ganglia. The 

 gastro-cesophageal ganglia are not long-stalked and have about 

 0.18 of the size of the last mentioned, with one large and two 

 rather large cells. 



m 



The eye has black pigment and yellowish lens. Immediately 

 behind the eye is the otocyst, scarcely larger than the eye, with 

 thirty-five to forty-five otoconia of the usual form. The rhino- 

 phoria are as in related forms of AeoUdiidse. 



The bulbus pharyngeus is shaped as usual, and is from 2.75 

 mm. to 4.5 mm. in length. The jaws (fig. 9), as commonly 

 among the Phidianse are yellowish-horn colored. The articula- 

 tion (fig. 9a) is rather small; the cutting blades arched (fig. 96) 

 their edges with a series of about fifty strong, sharp pointed 

 denticles (fig. 10), the uppermost short (fig. 10a), by degrees in- 

 creasing in size to about the length of O.Ofi mm.; the hindmost 

 are serrulate (fig. 106) on the posterior margin. The accessory 

 buccal cavity behind the articulation of the jaw rather large, and 

 filled with indeterminate animal matter. 



The radula is rather long and keel-shaped, the edge nearly 

 covered with twelve to fifteen teeth; behind these are eight to 

 eleven developed and two not quite developed; the total number 

 about twenty-five. The color of the teeth horn}--yellow r ish or 

 more brownish ; the height of the oldest about 0.09, of the } T oung- 

 est 0.16 mm.; the length of the basal part reaching 0.3 mm.; the 

 form (fig. 11, one to four) nearly as in the Coryphellse, but the 

 denticles (four to six on each side) longer and more slender and 

 (what hitherto scarcely has been observed in any form of the 

 group of AeoUdiidse) the trigonal points of the teeth are finely 

 denticulated on the under margin (fig. 11, one to four). 



The oesophagus is short. The stomach has rather strong folds. 



