6 Transactions of the Society. 



however, a trace of the " keystone " of C. plicata), dotted skin, and 

 total lack of the anal flanges (which become the "tads" of variety 

 hirundinella Murray). The spurs are not so different, except 

 in being papillose. 



Kikuyu: also known in Australia and Hawaii (Brit. Antarctic 

 Exped., 1907-9). 



Callidina allani sp. n. Plate I. figs. 2a-2c. 



Specific characters. — Size moderate ; trunk ovate, plicate ; corona 

 less than trunk, sulcus about half as wide as disk ; collar small ; a 

 horseshoe-shaped mark on the upper lip ; rostrum broad, antenna 

 short and very slender ; jaw triangular, teeth 2/2 ; rump sharply 

 marked from trunk, preanal subquadrate, anal rounded ; foot short, 

 of three segments, spurs relatively large, slender, divergent, with- 

 out interspace. 



General description. — Length, when feeding, 300//, diameter of 

 corona 60//, collar 45//., neck 40//, trunk 85//, preanal 50//, tip to 

 tip of spurs 25//, length of spur 15//,. The animal is hyaline, and 

 the longitudinal skinfolds are wide and shallow. The upper lip is 

 undivided — the skinfold from the collar diminishes in thickness to- 

 wards the lip and passes over the top of the horseshoe mark. This 

 is thickest at the top; and tapers to the ends. The jaw is triangular, 

 and is constricted just below the widest part. The two teeth are 

 about centrally placed in the length of the jaw. The two segments 

 of the rump have a characteristic constant form — the preanal has 

 nearly parallel sides — the anal is rounded posteriorly. 



Callidina allani belongs to the group of species resembling C. 

 habita and C. plicata. The horseshoe mark on the head distinguishes 

 it from all other species. It may correspond to the keystone mark 

 on the upper lip of C. plicata, but in that there is no ridge, but 

 simply fine lines. The form of spurs and the small and very slender 

 antenna are further points of correspondence with C. plicata. The 

 affinity is not close. G. punctata is much closer to G. plicata. 

 C. allani has some affinity with C. ehrenbergi Janson (12), which 

 also has the upper lip undivided. 



Kikuyu ; fairly plentiful. 



Callidina sp. ? Plate II. fig. 9. 



Description. — Small, hyaline, trunk closely plicate; corona small; 

 no teeth, but very fine stripe ; foot short, spurs short, obtuse. An- 

 tenna short. 



Length 250//, greatest width of trunk 50//, across spurs 15//, 

 length of jaw 15//. The rostrum is narrow and the lamella? fairly 

 large. The corona was not seen expanded, but it can be seen to be 

 small, the disks being joined to form a reniform body. The gullet 



