348 Transactions of the Society. 



Cathyiyna hastata sp. n. Plate XIV, figs. 2ba-2bd. 



Specific Characters. — Of moderate size, top-shaped ; dorsal plate 

 very much smaller than ^/entral ; anterior margins straight, bounded 

 by small spines, coincident. Toes one-third the length of con- 

 tracted lorica, broad, parallel-sided, each double-shouldered and 

 ending in a claw, which is shaped like a lance-head. 



Descrij^tion. — Length of contracted lorica 115 ^, of dorsal plate 

 90 yLt, width of ventral plate 100 jm, of dorsal plate 75 /a, of anterior 

 margin 85 /x, length of toe 40 ^, of claw 10 //-. The body is very 

 thick, the dorsal plate much arched, the ventral very protuberant. 

 The dorsal plate is very small, the disproportion of the two plates 

 being the greatest known in the family. From this it results that 

 there is no sulcus, lateral or posterior, the connecting membrane 

 simply sloping outwards from the dorsal to the ventral plate. On 

 this membrane the lateral antennae are conspicuous, a little in 

 front of the end of the dorsal plate. The dorsal plate has its widest 

 part well forward, and diminishes to the truncate posterior end. 

 In front its margin becomes obscure before reaching the anterior 

 border. There is a faint longitudinal wrinkling visible in the 

 extreme front, but it cannot be traced farther. The toes are 

 slightly decurved. The shoulders and cLiw appear much the same 

 in all views. 



I identified this animal at first as Gosse's C. diomis (40), but 



EXPLANATION OF PLATE XIV. 



Fig. 22. — Cathypna curvicornis sp. n. Dorsal view. 



,, 23a. — C. luchuign. Dorsal view. 



„ 236. Ditto. Foot. 



,, 24a. — C. nitida sp. n. Dorsal view. 



„ 246. Ditto. Toe. 



,, 25a. — C. hastata sp. n. Dorsal view. 



,, 256. Ditto. Ventral view. 



,, 25c. Ditto. Lateral view. 



,, 25cZ. Ditto. Optical section. 



,, 26a. — C. hornemanni. Half extended. 



,, 266. Ditto. Lateral view. 



,, 26c. Ditto. Dorsal view, contracted. 



,, 26fZ. Ditto. Ventral view, contracted. 



,, 27a. — C. flexilis (?). Dorsal view. 



,, 276. Ditto. Ventral view. 



„ 27c. Ditto. Foot. 



,, 28a. — C. aculeata. Dorsal view. 



,, 286. Ditto. Ventral view. 



„ 28c. Ditto. Foot. 



,, 29a. — C. nana sp. n. Dorsal view. 



,, 296. Ditto. Foot. 



,, 29c. Ditto. Lateral view. 



,, 30a. — Cathypna sp.n. (to be described by Mr. Harring). 



,, 306. Ditto. Ventral view. 



„ 30c. Ditto. Toe. 



(All figures are magnified 260 diani.) 



