A. E. Verrill — Marine Planarians of New England. 489 



other parts the spaces are rosette-like ; owing to the contraction of 

 the tissues the surface is reticulated by corresponding grooves. The 

 ovaries and spermaries when present are numerous and arranged 

 somewhat in rosettes, but they are not developed in most of the spe- 

 cimens, even when of large size.* The granular gland and muscular 

 penis-bulb together form a conspicuous, broad-pyriform organ (PL 

 XLiv, figs. 4, 4a, 6, 7, A'), which is partially translucent and shows 

 a radially vermiculated structure within (Jk!) and a central funnel-like 

 opening to the ejaculatory duct ; the anterior, opaque, rounded, 

 glandular portion, forms, in some specimens, a slight median angle, 

 or prominence. The muscular penis-sheath (figs. 6, 7, q) is strong 

 and usually regularly funnel-shaped. The penis (/>) is small, 

 tapered, styliform. 



The anterior female pore is near the male orifice, and in some spe- 

 cimens, owing to contraction of the tissues, both are brought close 

 together into a single pit-like depression (figs. 4, 7) ; the dorsal por- 

 tion of the female duct (w') is somewhat elongated, and its posterior 

 opening is at a considerable distance from the anterior orifice ; the 

 ventral part of the duct (v) is shorter and broader, and it receives 

 the ducts of numerous shell-glands (^o); at its upward bend it is con- 

 siderably dilated, and this part probably serves as a spermatheca. 



Behind the second female orifice ( ? ') there is usually visible a 

 slender median duct which appears to terminate in a minixte med- 

 ian pore {u) ; this is, perhaps, the central nephridial duct, but its 

 extension forward could not be traced in the preparations. 



The vasa deferentia are large and convoluted, in the specimens 

 containing ova, and extend forward to or beyond the middle of the 

 stomach. The uterine sacs, in the same specimens, are large and 

 moniliform, each one containing four or five rounded masses of 

 eggs ; they extend forward to about opposite the mouth. 



In the sexually developed specimens the spermaries are very 

 numerous, especially between the outer meshes of the gastric branches, 

 where there are few ovaries ; farther toward the center they often 

 form groups of five to ten around a single ovarian folicle, thus hav- 

 ing the appearance of a rosette, with the larger ovarian folicle in the 

 center, each rosette occupying one of the meshes formed by the 

 digestive tubes. 



Long Island Sound to Eastport, Maine, from low-water mark to 



* Probably the breeding season was mostly past when they were collected, in mid- 

 summer, but they are present in the original specimen obtained in April, and also in 

 the one from station 784. 



