No. 3.] LOXOSOMA DAVENPORT/. 357 



separation between bud and parent shall have taken place 

 (PI. XXXIII, Fig. 32). 



The epistome is present in L. Davenporti as a portion of the 

 atrial epithelium, which forms a projecting lip at the posterior 

 margin of the mouth (PL XXXII, Figs. 5, 7, and 11). Its oral 

 face is ciliated. 



I shall describe under the name of flask organs certain struc- 

 tures of unknown function not mentioned for other species of 

 Loxosoma, nor for other Bryozoa. They are illustrated in PI. 

 XXXII, Fig. ii,andPl. XXXIII, Figs. 16-19. The flask organs 

 are attached by their rounded bases to the wall of the body, near 

 the basal end of the stomach, and project laterally outward and 

 obliquely forward. The length of the organ is from one-half 

 to three-quarters the diameter of the stalk of the animal to 

 which it is attached. Many individuals have two of these 

 organs, one on either side ; others have one, while in some 

 specimens they are entirely absent. The peripheral portion 

 of the organ (PI, XXXIII, Fig. 16) is composed of a single 

 layer of epithelial cells similar in character to those covering 

 the body of the animal. The interior is occupied by gland cells, 

 about a half dozen in number, which have rounded bases and 

 long, tapering peripheral ends extending out into the pointed 

 extremity of the flask. At the extreme end of the organ there 

 exists a minute opening. Several stages in the life history of 

 these structures are shown in the figures. The first indication 

 of their formation is given by a thickening of the body-wall, as 

 represented in PI. XXXIII, Fig. 17. The ectodermal cells at 

 this point have become greatly elongated, forming a conical 

 elevation, of which the central cells have already begun to be 

 unlike the peripheral. A little later stage (PI. XXXIII, Fig. 1 8) 

 shows that these central cells have become clearly differen- 

 tiated from the rest ; their nuclei have become larger and have 

 taken a position near the basal end, and an abundance of fine 

 granules have made their appearance in the cytoplasm. The 

 surrounding cells have become shorter, and at the base of the 

 elevation the beginning of a constriction has appeared. In 

 the fully developed condition shown in PI. XXXIII, Fig. 16, 

 the whole body of the glandular cells is packed full of fine 



