ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 489 



The existence of numerous ventrally situated openings of the uterus 

 in OpJiidotsenia nalee g. et sp. n. is a new fact so far as concerns the 

 Cjclophvllidea (= Tetracotjlea). The diverticula of the uterus in 

 Ophidotaema, instead of being of a character similar to the median stem, 

 are closely beset with gland-cells and probably secrete the shell of the 

 ova, there being no shell-gland in this worm. There is here a possible 

 likeness to Mesocestoides, but the d''itails are different. 



The ripe eggs of Acanthotsenia varia not only tend to cling together 

 in balls, as has been described in other species of the genus, but a series 

 of distinct eggs are enclosed also, in many cases, within a common 

 sheath, which suggests a division of one original Qgg. A remarkable 

 abnormality is recorded in the same species, where in one proglottis the 

 male and female ducts open on to opposite sides of the body. 



New Tapeworm from a Viper.* — F. E. Beddard describes Soleno- 

 tse/iia viferis g. et sp. n., from the Crossed Viper {Lachesis alternaiis). It 

 is nearly akin to Ophidotsenia Beddard, and is externally marked in fully 

 mature proglottids by a ventral groove (a gaping uterine slit) extending 

 along nearly the whole joint. It is the only Ichthyotagniid as yet known 

 from the New World. The scolex is large and the apical sucker peculiar. 



Structure of Tailed Cercarias.f — R. Dollfus discusses Gercaria 

 pachycerca Diesing and other forms with very short stump-like tails 

 persisting throughout the cercaria stage and a relatively large simple 

 bladder. They are characteristic of Molluscs, such as Helix, Limnsea, 

 and Buccinum. It seems that Cercaria pachijcerca from Trochus, G. 

 linearis from Littorina littorea, and G. huccini from Buccinum form a 

 natural group, which the author calls cotylocercal. There are no true 

 redise, the cercaria arising from sporocysts ; the body is elongated ; the 

 oral sucker has a stylet with large glands ; the bladder is large, simple, 

 occupying most of the posterior part of the body behind the ventral 

 sucker, showing a single-layered wall of very large granular and appar- 

 ently glandular cells ; the tail is very short but yet well developed and 

 with adhesive sucker-like functions. Dollfus emphasizes the fact that 

 very similar cercarise often occur in very different hosts, and that very 

 different cercariaj may occur in the same environment. 



New Trematodes from Birds.!— K. J. Skrjabin establishes in the 

 vicinity of Typhloca^lum a new genus Tracheophilus. The genus in- 

 cludes medium-sized Monostomids ; with a flat body rounded at both 

 ends ; with a subterminal mouth ; with simple unbranched diverticula 

 on the internal aspects of each limb of the bifurcate gut : with the 

 genital opening in front of the pharynx ; with strongly developed yolk- 

 sacs, consisting of small follicles on each side dorsally and ventrally of 

 each limb of the forked gut ; with gonads in the posterior third of the 

 body ; with testes and ovary always marginal and roundish-oval ; and 

 with a coiled uterus between the two halves of the gut. The species 



* Proc. Zool. Soc, 1913, pp. 243-61 (9 figs.). 



t Resumes des Communications 9^ Congres Internat. Zool. Monaco, 1913 

 ser. 3, pp. 38-42. 



t Centralbl. Bakt. Parasitenk., Ixix. (1913) pp. 90-5 (1 pi.). 



