FAMILY SPH#ROMIDA. 135 
(3) Dynamene bidentata (Mont.). 
Mouth-parts of an adult male, all seen from below; x 35. 
Fic. 3 a.—Left mandible. 
Fig. 3 6.—Left maxillula. 
Fie. 3 c.—Left maxilla. 
Fie. 3 d.—Left maxilliped. 
(4) Dynamene bidentata (Mont.). 
Mouth-parts of an ovigerous female, seen from below ; all x 38, thus nearly 
the same enlargement as in the male. 
Fic. 4a¢.—Left mandible ; the dotted line indicates the outer margin of the 
mandible situated beneath the firm skin by which the mandible is united with 
the head. 
Fic. 46.— Right mandible. 
Fie. 4¢e.—Left maxillula. 
Fie. 4d.—Left maxilla. 
Fie. 4e.—Left maxilliped. 
(5) Hemispheroma pulchrum (n. gen., n. sp.). 
Fie. 5a.—Left mandible of an immature female, seen obliquely from the 
inner side and from below; xX 24. 
(6) Cassidina typa (M.-Hdw.). 
Fia. 6 ¢.—Left maxilliped, from below; x 2°. 
vou. 49, pART 1,—NEW SERIES. tf 
