146 Proceedings of the Biological Society of Washington. 



Type of the genus. — The genus contains only one known species, Gar= 

 gariscus semidentatus, new species. 



Type of the species.— The type is 22.7 cm. long, from a depth of 169 

 fathoms in the Mindanao Sea, on a bottom of globigerina ooze ("Alba- 

 tross" station 5517). U. S. Nat. Mus. No. 78,249. 



The collection contains 12 examples obtained from dredging stations 

 between northern Mindanao and Verde Island Passage, in depths of 118 

 to 805 fathoms. The specimens range from (3.5 to 25.0 cm. in length. 



Heminodus, new genus. 



The differential characters are shown in the above key. 



Type of the genus. — The genus contains a single known species, Hemi= 

 nodus philippinus, new species. 



Type of the species. — The type is 16.8 cm. long, from the Mindanao 

 Sea off Tawi-tawi ("Albatross" station 5517). U. S. Nat. Mus. No. 

 78,250. 



The collection contains two other specimens from two other stations in 

 the same region, the deepest dredge haul being in 277 fathoms. 



