556 Transactions of the Society, 



Length of contracted lorica 62 />t, of dorsal plate 55 /x, of toe 

 30 /x; breadth of dorsal plate 35 fi, of anterior margin 22 yu,. 



The undulate margins should indicate faceting, but I cannot 

 see that on the surface. As in G, ploenensis the two plates exactly 

 coincide in front. There are characteristic wrinkles on the ventral 

 plate (fig. 19&). 



Habitat. — In Mr. Rousselet's collection. 



Oathypna clara Bryce (6). Plate XXII, fig. 6. 

 Syn. Distyla clara Bryce. 



Descrijytion. — Small, lorica bottle-shaped, with a shortly oval 

 trunk and a smaller frontal portion separated by a neck, rounded- 

 behind. Dorsal plate much wider, longitudinally sulcate. Pos- 

 terior lobe short, rounded. Toes short, tapering, curved. 



Length of lorica 90 /x, of dorsal plate 83 jn, of toe 25 fji, ; breadth 

 of dorsal plate 55 /x, of ventral plate 40 /x, of frontal margin 35 /x. 



Studied from a fully-extended specimen. The separation of 

 part of the lorica, apart from the head, is a unique character. The 

 ventral plate has a constriction behind the middle. 



How far the characters of this specimen are individual, and 

 due to its condition, I cannot tell. It seems like an animal in its 

 proper shape, but Mr. Bryce's figures, drawn from the living 

 animal, do not show the constriction. 



Hahitat. — In Mr. Rousselet's collection ; one of Mr. Bryce's 

 specimens. 



Cathypna inermis Bryce (-5). Plate XXII, figs. 7a, Ih. 

 Syn. Distyla inermis Bryce. 



Description. — Small and very narrow; dorsal plate much 

 narrower than ventral, widest in front, truncate both ends. Ven- 

 tral plate parallel-sided for two-thirds of length, diminishing to 

 front. Posterior lobe very prominent, round. Toes short, parallel- 

 sided half-way, ra})idly tapering to very long slender points. 



Length of lorica 75 /x, of dorsal plate 62 /x, of toe 25 /x ; breadth 

 of dorsal plate 22 /x, of ventral plate 33 /x, of anterior margin of 

 lorica 20 yix. 



Studied from a fully-extended specimen ; it is not fairly 

 comparable with other conti'acted species. It is evidently a very 

 distinct species, with its long narrow dorsal plate, prominent 

 posterior lobe, and long pointed toes. 



It is a difficult animal to interpret, being apparently soft and 

 flexible in life. It was after considerable difficulty that I arrived 

 at an understanding of the dorsal plate, and of its relation to the 



