436 



Ebnerella Gregorii v. Lendf. und Ebnerella Bucchichii v. Ebner, unter- 

 scheidet sich aber durch Abwesenheit von Rhabden und durch die 

 Form und Dimensionen der Tetractinen und Triactinen. 



Farbe: glänzendweiß. 



Fundort: Amboina (Molukken). 



Ich habe nur ein Exemplar von dieser Art, die ich nach dem 

 hochverdienten Finder nenne, gefunden, und ich werde eine einge- 

 hendere Beschreibung und Abbildungen dieses Schwammes an ande- 

 rem Orte folgen lassen. 

 Berlin, 28. August 1896. 



4. Stichostemma asensoriatum n. sp., a freshwater Nemertean from 



Pennsylvania. 



By Thos. H. Montgomer y jr., Ph.D. 



eingeg. 4. September 1896. 



In a small stream, having the local name of Taylor's Run, situated 

 about a mile to the north-west of the town of W. Chester, Chester 

 Co., Pa., I collected about 16 specimens of a small Nemertean dur- 

 ing the past summer (month of July) , and have since found that 

 these represent a new species of the genus SticJiostemma. The new 

 species resembles S. Eilhardi (cf. my paper in Zeit. f. wiss. ZooL, 59, 

 1895), very closely externally, but offers a number of anatomical differ- 

 ences which justify the establishment of the new species. 



These characteristics are the following: 1) the absence of the su- 

 praoral sense-pit, which suggested the specific name ^^ asensormtum'\ 



2) The cephalic gland is not as voluminous as in Eilhardi^ and has not 

 one main efferent duct, but the ducts of the individual gland-cells 

 penetrate the body epithelium independently of one another, in the 

 manner of subcuticular gland-cells; the external openings of these 

 cells lie at the anterior end of the head. The want of a main effer- 

 ent duct, formed by the fusion of the individual cell-ducts, might 

 be explained by the absence of the supraoral sense-pit, since in most 

 Metanemerteans the main duct discharges at the base of this pit. 



3) The pigment of the body epithelium occurs exclusively in the sup- 

 porting cells, and is not found at all in the interstitial tissue. 4) Those 

 gland-cells corresponding to what I have termed "gland-cells 3" in 

 S. Eilhardi^ are not egg-shaped, as in that species , but have an elon- 

 gated, narrow form; in structure and in their color reaction to stains 

 they show a close similarity to the cells of the cephalic gland : thus 

 they stain intensely with haematoxylin, and with the triple stain of 



