140 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i04 



factory due to a lack of good fixation. However, the main features 

 of the copulatory apparatuses have been ascertained and are repre- 

 sented in figure 88,a. The male apparatus is crowded beneath the 

 rear part of the pharynx. The male pore leads into an antrum contam- 

 ing the penis, inclosed in a long narrow sheath. The penis stylet is also 

 long with a blunt tip. The penis is bent at an acute angle to the rest 

 of the male apparatus. The small papilla that bears the stylet con- 

 tains as usual two ducts that unite within it. One duct, the prostatic 

 duct, leads to the oval prostatic vesicle. The other duct piu-sues a 

 rather narrow course for some distance, then widens into the retort- 

 shaped seminal vesicle with prominent circular muscle fibers forming 

 its walls. The rear part of the seminal vesicle turns forward and 

 receives at once the voluminous spermiducal vesicles from in front. 



The female gonopore lies well behind the male pore and opens into 

 a sacciform antrum that is not, as might be supposed, a cement pouch 

 and does not receive cement glands. Instead the cement glands 

 open into a vertical narrow vagina extending dorsally from the antrum 

 and acting as a cement duct. From this the vagina continues dorsally 

 as a widened tube that turns back and receives the uteri. A pair of 

 very large uterine vesicles, one of which is shown on figure 88, a, was 

 evident in the live specimen (Hyman, 1952, fig. 3) and in the set of 

 sagittal sections but cannot be seen on the preserved whole specimens 

 nor in the set of transverse sections. The latter, however, is badly 

 broken in the region of the vesicles. The vesicles are packed with 

 eosinophilous material of indeterminable nature. The connection 

 of the uterine vesicles with the rest of the female apparatus could not 

 be traced in the available material. 



Differential diagnosis: Acerotisa multicelis differs from other 

 species of the genus in the large size, numerous eyes, and provision 

 of the margin with a row of flask-shaped glands. 



Distribution: Florida, West Indies. A specimen collected Apr. 

 16, 1951, at Alligator Harbor, northwest coast of Florida, was sent 

 alive by H. Humm. Two preserved specimens, taken Aug. 1, 1951, 

 by F. M. Bayer in the Biscayne Bay region of Florida, were sent pre- 

 served by the U. S. National Museum. From the same institution 

 came four preserved specimens collected Mar. 29, 1937, by the Smith- 

 sonian-Hartford Expedition along the shore of San Juan Harbor, 

 Puerto Rico. 



Holotype: One whole mount deposited in the U. S. National 

 Museum, No. 24627; also one other whole mount and one set of 

 transverse sections (six slides) to that institution, Nos. 24628, 24629. 



