PLATE XXIV. 



PAGE 



Figs. 1, la, \h. Thrinaco'phorafuniformis; three sppoimcns. showing the variation 



in external appearance ; natural size, . • .195 



Fie. 2. Desmacidon conulosa ; natural size, . . . • . 1 OG 



Fig. 3. Desmacidon (HomoBodictya) kerguelenensis ; natural size, . . 110 



Fig. 4. Desmacidon (?) ramosa ; natural size, . . . . .107 



