73 PROCEEDINGS OF THE ACADEMY OF [1879. 



angulated or with the angles rather produced. The edge of the 

 cutting-blades of the mandibles with several rows of knobs or 

 denticles. The lateral plates of the tongue have the superior 

 (interior) margin not smooth (as in the Galvinas) but denticu- 

 lated. The penis is unarmed. 



In my last memoir upon this genus, to which the reader is re- 

 ferred, 1 have given a list of nineteen species which seem to belong 

 to this genus. Four of them are from the Pacific ocean. 



1. C. Foidisi (Angas). 3. C. parvula (Angas). 



2. G. semidecora (Angas). 4. G. athadona, Bergh. 



1. Coryphella, sp. Pi. I f. 13-14; PI II. f. 7-8. 



Bab. M. Pacif. (Ins. Aleut.). 



Only the bulbus pharyngeus of this form has been found by 

 Pall in dredging at Adakh Island (Aleutians) in mud, at a 

 depth of 9-16 fathoms, in June, 1873. 



The lenp-th of the o reran was 5.0 mm., with a height of 4.0 and 



Oct D 



a breadth of 5.0 mm. ; the form short, much broader in the hind- 

 most part; the radula sheath a little prominent behind the buccal 

 ganglia. The labial disk of usual oval form ; l the greatest part of 

 the bulbus covered" by the mandibles; the m. transv. sup rather 

 large. The mandibles (fig. 7) large, nearly as long and as high 

 as the bulbus, of yellow horn-color; the articulation rather small 

 (Fig. 7) ; the edges of the cutting blades with 4 to 6 (fig. 8, 13) 

 rows of low knobs, which on the anterior margin, except in the 

 uppermost parts of the cutting blade, rise to denticles of the 

 height of 0.1 mm. The tongue rather short; on the upper side 

 nine rows of plates, further backwards seven rows of developed 

 and two of not quite developed teeth; the total number of rows was 

 eighteen. The teeth as usual of horn-yellow color, very strong ; 

 the breadth of the foremost medial ones about 0.16, of the hindmost 

 0.25 mm. The medial ones with five to seven denticles on each side 

 of the strong point (fig. 14) ; the lateral ones with a long point, 

 and five to six denticles on the inside at the base (tig. 14 aa). 



The cerebro-visceral ganglia short, reniform, somewhat broader 

 at the anterior end ; the pedal ganglia rounded, scarcely smaller 

 than the former. The buccal ganglia are of oval form, about one- 



1 In the mouth, half banging out, was found a fine Caprella, the body 

 having the length of 6 mm. 



