ZOOLOGY AND BOTANY, MICROSCOPY, ETC, 757 



which was found by Molin in the same host, by tlie presence of wing- 

 like appendages which project from the head. There are also rainor 

 diiferences both at the anterior and posterior ends. The animal is about 

 30 mm. long and about 1 ram. broad, and a minute description is given 

 of it. 



Vitality of Trichinae.* — M. P. Gibier finds that if small fragments 

 of trichinized flesh be exposed to a temperature of 20 or 25 degrees 

 belovv zero, they exhibit a characteristic activity such as is not seen in 

 trichina of salted meat before refrigeration. 



-y. Platyhelminthes. 



Fresh-water Turbellaria.f — Dr. E. Sekera first dscusses the sexual 

 relations of Microstoma; sexual and asexual reproduction maybe seen in 

 the same individual, and at the same time. The gonads are foimd both 

 in separate individuals and in the zooids, and are generally of one sex 

 only ; in rare cases, however, hermaphroditism obtains, and this is a 

 condition which the author is inclined to reg ird as ativistic ; in such 

 cases the male gonads are developed before the female. 



The genus Stennsloma should be removed from Graff's family of the 

 Microstomidse, and form an indejiendent group of Stenostomidae, in 

 which should also be placed the genera Catenula and Bhjjnchoscolex. In 

 the third j)ait of his work the author gives an account of some new or 

 little known species — these are Mesostoma hirudo Schmidt, Vortex 

 coronarius Schmidt, V. pnucispinosus and Bothriojplana alacris spp. nn. 



Microstoma papillosum. | — Dr. L. Bohmig finds that in Microstoma 

 papillosum the genital products are produced in two (sexual) indi- 

 viduals ; that the colonies are monoedous, and that, in all proba- 

 bility, asexual reproduction ceases during sexual reproduction, and 

 that chains, the individuals of which possess genital organs, consist of 

 two individuals of the first order. Sections must be made to determine 

 whether the separate individuals of the chain are unisexual or herma- 

 phrodite. 



Notes on Entozoa.§ — Signor F. S. Monticelli has notes on some new 

 and rare species in the collection of the British Museum. Distomum 

 microporum is a new species found in Plagyodusferox ; Trematoda have 

 not before been observed in the Plagyodont na. PeUchnobothrium 

 speciosum sp. n., from Alepidosaurus ferox, is the type of a new genus in 

 which the head has a large pyramidal haustellum, truncated anteriorly 

 and provided with a well-developed terminal sucker ; there are four 

 bothria which have the form of a basin, and are completely adherent to 

 the head ; each has an accessory scrobiculiform sucker, and they are 

 arranged in couples on either side of the head. Taenia falcif or mis Baird 

 was, with a query, said to have an unarmed rostellum ; Signcjr Monticelli 

 finds that it is armed with eight very slender and long hooks of charac- 

 teristic form. Similarly, Tsenia calva Baird from the grouse (Lagopiis 

 scoticus) has not an unarmed rostellum, but one which is provided with 

 a small crown of very numerous minute hooks. T. bifaria, enumerated 



* Comjiteri Rendus, cix. C18S9) pp. 5.S3-4. 



t SB. K. Bohm. Gesell. Wiss., 1SS8 (18S9) pp. 304-48 (4 pis ). 



X Zool. Anzeig., xii. (1889) pp. 479-83. 



§ Proc. Zool. (Sue. Loiid., I8ji9, pp. 321-4 (1 pi.). 



