310 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Larval Trematodes in Gastropod Hosts.* * * § — Sig. P. Sonsino de- 
scribes seven different forms of Cercaria-larvae found in 12 freshwater 
Gastropods, sucli as species of Limnsea and Dlanorbis, but he has not 
been able to connect them with adult forms. 
Helminthological Notes.f — Sig. P. Sonsino has notes on Distomum 
felineum and D. truncatum from the dog, a Cysticercoid from Ascalobotes 
mauritanica, Eustrongylus gigas from the dog, Syngamus trachealis , and 
some other parasites. 
Trematode Parasites of Fishes.! — Dr. E. Linton describes from his 
own collection, and from the United States National Museum, 32 Trema- 
todes from fishes. The account deals with species of Nitzchia, Tristo - 
mum, Octoplectanum, Diplostomum, Monostomum , and Distomum, the last 
forming the great majority. 
Minute Structure of Genital Organs in Tri8enophorus.§ — Herr H. 
Sabussow has used Golgi’s chrome-silver method and the intra-vitam 
methylen-blue method in studying these organs. The present com- 
munication deals with some histological details, of which the most 
interesting is the occurrence on the cirrus pouch and vagina of what 
seem to be the much branched terminations of motor nerve-cells. 
Cestodes of Fishes. || — Dr. E. Linton has a series of notes on 45 
species of Cestodes from fishes collected at Woods Holl and in the 
United States National Museum. Seven are new. 
Parasites of Birds. ^[— Prof. H. B. Ward gives a general popular 
account of parasitic worms found in domesticated birds. It is known 
that the turkey has 14 different parasites, the duck 32, the chicken 43 ; 
but, as the author points out, there are doubtless many more to be found. 
His paper is a useful one for poultry-keepers to begin with. 
Tapeworms of Ducks.** — Mr. T. B. Eosseter has demonstrated by 
experimental infection of ducks the development of Dicranotsenia 
coronula, Drepanidotsenia gracilis, and Dr. tenuirostris from their cysti- 
cercoid stages. 
Musculature of Dibotkria.jf — Dr. M. Liike has followed up his 
study of the musculature in Tseniadm by an investigation of the same 
system in Dibothrium and the like. The detailed results are beyond 
our scope, but it may be noticed that Liihe corroborates his previous 
conclusion that the entire musculature of Cestodes is referable to two 
systems of longitudinal and transverse muscles, effecting contraction 
and elongation of the tapeworm body. The transverse muscles include 
those termed sagittal and transversal, and the subcuticular transverse 
fibres. 
* Atti Soc. Toscana Sci. Nat.., x. (1807) pp. 219-53. 
t Tom. cit., pp. 253-9. 
t Proc. U.S. Nat. Mus., xx. (1898) pp. 507-48 (15 pis.). 
§ Biol. Centralbl., xviii. (1898) pp. 183-8 (5 figs.). 
|| Proc. U.S. Nat. Mus., xx. (1897) pp. 423-56 (8 pis.). 
U Stud. Zool. Lab. Univ. Nebraska, No. 22 (1898), 18 pp., 5 figs. 
** Journ. Quekett Micr. Club, vi. (1897) pp. 397-405 (1 pi.), 
tt Centralbl. Bakt. u. Par., xxii. (1897) pp. 739-47 (2 figs.). 
