PLATE I. 



Fig. I. Operculum Limacina iiiflata d"Orb., from the outside. 



Fig. 2. Stomach Limacina hcUcina Phipps, ventral view. (,-, oesophagus; b, beginning of the intestine; 



c, coecum. 

 I'ig- 3- Central nervous system Limacina lulicma Phipps, A, ventral view. B, from the left side. C, from 



the right side. 

 p and p' , left and right pedal ganglion; v and v , left and right visceral ganglion; c and c , left 



and right cerebral ganglion; i and i', nerves to the fins; 2, left pallial nerve; 3, right pallial 



nerve; 4 and 5, visceral nerves; 6 — 9, nerves to the tentacles and to the lips; 10, cerebral 



commissure; ^Z. and ot , left and right otocyst. 

 Fig. 4. Shell Peraclis reticulata var. minor. 36 ■ . 

 Fig. 5. Shell Peraclis rissoides n. sp. 33 X. 

 Fig. 6. Operculum of the same, from the outside. 

 Fig. 7. Shell Peraclis moluccensis n. sp. 25 X. 

 Fig. 8. The same, seen from apex. 20 :■:. 

 Fig. 9. Fragment of the same, seen from ape.x. 60 X. 

 Fig. 10. Operculum of the same, seen from the outside. 

 Fig. II. Head Peraclis rissoides n. sp. Dorsal view. 

 Fig. 12. Jaw Peraclis reticulata var. minor, 2"Q ser. of right jaw. 

 Fig. 13. Pallial gland Peraclis rissoides n. sp., from the outside, a, "balancer". 

 Fig. 14. Central nervous system Peraclis rissoides n. sp. A ventral view. B, from the right side. 



Explanation of letters the same as in fig. 3. Besides, /. v., posterior visceral ganglion. 

 Fig. 15. Shell '^Agadina" n. sp. A, from aperture. B, from umbilicus. 22 ■ . 

 Fig. 16. Shell (probably abnormal) of Clio (Hyalocylix) striata (Rang). Ventral view. 10 X. 

 Fig. 17. Embryonic shell of Clio (Hyalocylix) striata (Rang). 



Fig. 18. Intestine Clio cuspidata. a, intestine; b, glandular organ, attached to it. 

 Fig. 19. Accessory genital glands Clio (Creseis) acicula (Rang), from the left side, a, efferent duct of the 



gonad; b, accessor)^ genital gland; c, vas deferens (" Vagina" Gegenbaur); d, receptaculum seniinis (?). 

 Fig. 20. Genital organs Clio (Styliola) siibula (Quoy et Gaimard). Dorsal view. 

 Explanation of letters the same as in fig. 19. g, gonad. 



