ALEXANDROMENIA AGASSIZI. 137 



their way, the cells are very high and slender and the cytoplasm vacuolated. 

 In the outer half the cells are not over one third as high and the protoplasm 

 is relatively compact. 



As just noted the branching ducts of each side unite into a single tube, 

 which opens into the bottom of a deep depression on the side of the pharynx. 

 From the base of this pit a large conical papilla (Plate 36, fig. 10), whose surface 

 is thrown into five or six circular folds, projects inward, in life its tip probaljly 

 extending as far as the opening into the pharynx. It is practically solid, con- 

 sisting of connective tissue and several muscle fibres which probably act as 

 retractors. The ductules of a very few adjacent follicles make their way into 

 this protuberance and are accompanied by similar tubules from some of the 

 dorsal salivary-gland cells. These slender canals make their exit at several 

 points, from the tip and by means of pores ventrally ])laced on the circular folds. 

 The last named openings connect with small canals (perhaps one sixth the length 

 of the circumference of the fold), located between the cuticle covering the papilla 

 and the underlying ejjit helium. There may be other exits but if so they are of 

 small size and are invisible in the material in hand. 



Attached to the pharynx, between these large glands (sg.) and the stomach- 

 intestine another extensive set occurs (Plate 7, fig. 3, and Plate 20, fig. 2) that are 

 difficult to homologize. They consist of numerous pyriform cells, highly vacuo- 

 lated or containing masses of some secretion of a pinkish shade, arranged in the 

 form of lobules bounded by muscle and connective-tissue fibres. The ductules 

 pass to the pharyngeal epithelial lining through which they open by intercellular 

 channels. 



The radula is relatively small and is located on a tongue more than usually 

 pointed. It is of the monoserial type (Plate 34, fig. 5) and as far as may be 

 determined from transverse sections, comprises between forty-five and fifty- 

 three transverse rows. Each tooth is a narrow rectangular plate bent to form 

 a very obtuse angle. The odontoblasts are of the usual columnar type. The 

 radula sac is supported by ten or fifteen pairs of large cells, probably turgid in 

 life, filled with a highly watery secretion, surrounded by connective tissue and 

 muscle fibres. These last named elements are part of bands, too complicated 

 to allow of reconstruction, that attach to the pharyngeal wall, the radula, or the 

 sheath of the salivary glands. 



The gonad, with the usual relations, extends from a short distance posterior 

 to the radula to within a short distance of the front end of the pericardial cavity. 

 In common with other hermaphroditic Solenogastres the organ in this species 



