Plate VI. 

 Pourtalesia laguncula Al. Ag. Pourtalesia carinata Ai,. Ag. 



The iiinbulacral system coloured. 



Fig. 37. 'riie skeleton of P. laguncula, veutral view, p. 17. 



¥ig. 38. Tlie skeleton of P. laguncula, another speoimen, ventral view. 



Fig. 39. Tlic sub-oral region of the same. 



Fig. 40. The sub-oral region of the specimen tig. 37. 



Fig. 41. A peristomal pedicel and spherid, of the same. 



Fig. 42. The sub-oral area of P. carinata. 



Fig. 43. The same, from another spucimen. 



Fig. 44. Peristomal part of the same area, from the specimen fig. 42. 



Fig. 45. The infra-frontal reoess, seen from the peritoneal cavity; left 



Fig. 46. The involuted part of the labial region. 



