ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 325 



excepfcious they occurred in the larynx. In no case were the males and 

 females found apart. An account is given of the general structure of 

 both sexes. Except in one special case no pathogenic effects could 

 be traced to the parasite. It seems that the eggs are passed out under 

 the posterior flap of the saddle-shaped pouch of the male embracing the 

 flattened boss on the body of the female on which the vulva opens. For 

 it appears very wasteful that the eggs should only escape, as is usually 

 supposed to be the case in S. trachealis, by the bursting of the female 

 worm. J. A. T. 



Platyhelmintlies. 



Head-g-eneration in Planarians. — C M. Child {Journ. Exper. 

 ZooL, 1020, 30, 408-18, 8 figs.). Isolated pieces of Planaria cloroto- 

 cepliala do not always show uniform reconstitution or regeneration. The 

 structures produced at the anterior ends of pieces show a graded series 

 from normal heads to headless healing of the wound. Five types have 

 been distinguished — normal, normal but teratophtbalmic, teratomor- 

 phic with more marked inhibition of the median region, anophthalmic 

 without eye-spots, and acephalic with a mere healing of the wound and 

 no outgrowth. The term " head-frequency " is used to indicate the 

 frequency with which these different types of anterior end occur in a 

 given set of pieces. Head-frequency in the regeneration of pieces is 

 lower in physiologically younger (smaller) than in physiologically older 

 (larger) animals. Head-frequency is lower in pieces from starved than 

 in pieces from well-fed animals, even when the two are of the same size. 

 Head-frequency is higher in pieces which are frequently stimulated to 

 motor activity during at least several hours after section than in pieces 

 remaining undisturbed. The range of head forms is the same in relation 

 both to physiological conditions and to external chemical and physical 

 agents, and the changes produced are changes in the frequency of the 

 different forms. This non-spacific effect of both physiological and 

 external factors indicate that the action of these factors is essentially 

 quantitative. J. A. T. 



New Japanese Polyclads.— Megu^ii Yeri and Tokio Kaburaki 

 {Aniiot. Zool. Japoii , 1920, 9, .591-8, 5 figs.). A description of Neo- 

 stijloclms fulvopunctatus g. et sp. n., near Stylochus, with oval body, no 

 tentacles, marginal eyes confined to the frontal margin, true seminal 

 vesicles, prostate dorsal to seminal vesicle, slender tubular penis, and 

 large single accessory vesicle to the vagina. There is also an account of 

 Prosthiostomum trilineatmn sp. n., differing widely from other species in 

 its coloration. J. A. T. 



New Distome fromRana aurora. — W. W. Cort {Publications Unio. 

 California, Zoology, 1919, 19, 283-98, 5 figs.). In the intestine of the 

 red-legged frog, in fourteen cases out of thirty, anew Distome was found, 

 Marqeaaa calif or niensis g. et sp. n., 2*4-5 mm. in length. It shows 

 the characters of the sub-family Brachycoeliinae ; digestive system with 

 prepharynx, short oesophagus, and intestinal caeca extending into the 

 posterior fifth of the body, but not reaching the posterior end ; excretory 

 system of the " 2-6-3 " type, with a club-shaped bladder ; vitellaria 



