113 



301 



The mature male in size and f^eneral structure, disregarding tlie sexual organs and the 

 alimentary tract, shows a great similarity to the immature females. It lacks an alimentary 

 tract entirely; M. was unable to find a nephridial system, though undouh- 

 tedly the latter must be i)resent. The thickened hypodermal ring at the 

 anterior end of the body bears a single ring of long, vibratile cilia, and 

 in the projection of the trunk, anterior to this ring, lie two semicircular, 

 dorsal, red eyes. The foot is very short, without peduncle. The hypodermis 

 is thickened and with an irregular scalloped inner contour. A dorsal sense- 

 organ is well developed. In the anterior region of the trunk lies a large 

 mass, which may in ])art represent a cerebral ganglion. The genital organs 

 consist of a huge sperm sack, connected with a cirrus. This sperm sack 

 is fdled with spermatozoa, and its walls thin, except at one point on its 

 dorsal surface, which is thickened; probably this thickening represents 

 the germinal epithelium and therefore the testis proper. A curled thick- 

 walled tube, the cirrhus, follows the sperm-sack; its lumen, the vas de- 

 ferens is verj' narrow. A thin-walled short tube connects the posterior end 

 of this cirrhus with the dorsal genital aperture; and within this tube beat 

 long cilia, which are attached to the posterior end of the cirrhus. The 

 cirrhus may be protruded some distance out of the genital aperture, and 

 probably serves as an intromittent copulatory organ. On the ventral side 

 of the cirrhus, in close attachment to its wall, is a large dense bodj', with 

 an axial pyriform clear space, a gland; the clear space being its ductus. 

 Just posterior to this gland is a lobed body, projecting into the body cavity, 

 bearing on one of its surfaces long cilia, which beat in the body cavitv. 



Flosciilaria probos- 

 cidea $ atter Mont- 

 gomery. 



Floscularia calva Hudson. 

 Male: Hudson-Gosse 1889, p. 56. 

 HuDSON-GossE (1889, p. 56, PL III, fig. 3a, 3b). Hudson states: 

 "I am indebted to Mr. Hood for drawings of the j'oung male and female each of which 

 he saw hatched from egg laid in the tube. The male is about ^lo inch in length and resembles 

 that of F. campaniilata." 



Floscularia mutabilis Bolton. 



Male: Hudson-Gosse 1889, p. 56. 



HuDSON-GossE (1889, p. 56, PI. Ill, flg. 2c). Hudson says: 



"I have seen what I believe to be the male but I failed to isolate it so as to make out 

 its internal organs." 



Floscularia cucuUata Hood. 



Male: Hood 1894, p. 335. 

 Hood (1894, p. 335, Tab. XVI, flg. 3) writes: 



"The male has a prominent dorsal antenna; all other males of Floscules, so far as ob- 

 served, having no such antenna; it has also two small eyes close together." 



Floscularia ambigua Hudson. 

 Hudson-Gosse 1889, p. 53. 

 HuDSON-GossE (1889, p. 53) writes: 



"Mr. Hood has twice seen tlie male, hatched from the egg, laid in llie tul)e, and noticed 

 the motion of its spermatozoa in the sperm-sack."' 



D. K. D. Vidensk. Selsk. Skr., naturv. of mathem, Afd., 8. R.-cUke, IV, 3. 4q 



