136 ALEXANDROMENIA AGASSIZI. 



ance in sections. In front of the radula especially, large projections appear and, 

 as will be more fully described presently, afford an outlet for the two sets of sali- 

 vary glands. The character of the pharyngeal epithelium undergoes minor 

 modifications at various points, but in general it may be said that the constituent 

 cells range in size from cubical bodies to others three times as high as wide, are 

 devoid of cilia and are bounded by a well-defined cuticular sheet. 



The salivary glands, which probably are homologous with the dorsal set in 

 other Neomenina, are in this species remarkable for their size and extent. With 

 the exception of a few scattered groups of cells the main portion is distributed 

 in the form of a wide band encircling the pharynx from immediately behind 

 the brain to the radula (Plate 7, fig. 3, ds). So far as may be determined from a 

 single specimen all the cells are pear-shaped and are grouped into club-shaped 

 lobules of various sizes. In the expanded part the cells are one layer thick and 

 surround a central canal down which the ductules make their way to open by 

 intercellular canals into the pharynx. 



From transverse sections there are indications that a portion of the gland 

 located on the dorsal side of the pharynx immediately behind the brain differs 

 in character from the remaining portion. The follicles are more slender than 

 those of adjoining regions and the glandular products in the early stages of 

 their development are of lavender color and markedly different from the yellow- 

 ish pink substance elsewhere. All the follicles of the dorsal salivary glands of 

 whatever character are supported by numerous muscles forming the pharyngeal 

 wall and by connective-tissue bands between which numerous blood sinuses 

 are present. 



The glands which probably correspond to the ventral salivary of other 

 Solenogastres although in this species their outlet into the pharynx is somewhat 

 more in front of the radula than usual, are enormously developed. As may be 

 seen (Plate 7, fig. 3, sg.) they extend from the brain to a point considerably 

 behind the radula where they entirely surround the alimentary canal and else- 

 where overlap it to a very considerable degree. As in the dorsal group the 

 gland is composed of thick-wallcd follicles, of large size, and from each pyriform 

 cell a ductule leads to its intercellular outlet. Owing to the great bulk of the 

 lobules and the remoteness of the greater number from the main duct (leading 

 into the pharynx) this latter canal is provided with numerous branches (Plate 

 26, fig. 9) which come in contact with the majority of the follicles where each 

 ends blindly. These minor ducts are lined by an epithelium in which the cells 

 are of two distinct types. In the inner half, through which the ductules make 



