618 SUMMARY OF CURRENT RESEARCHES RELATING TO 
author notes that the spermatogenesis of Cestodes is, according to his 
researches, virtually the same as that above described for Trematodes. 
Vitelline Nucleus in Ova of Trematoda.* * * § — Dr. F. 8. Monticelli 
has studied this structure in the ova of Distomum veliporum and D. Bichi- 
ardi. He does not agree with Balbiani and Sabatier, but rather with 
Schiitz, Stuhlmann, and von Jhering, concluding that the vitelline 
nucleus has no intimate connection with the germinal vesicle, has no 
role in the process of fertilization, but is rather a cytoplasmic product, 
a nutritive differentiation, probably acting as a centre in the formation 
of yolk. 
Classification of Cestoda.| — Dr. F. S. Monticelli has some syste- 
matic notes on the genus BotJirimonus Duvernoy, of which he recognizes 
three species, whose synonymy is somewhat intricate, viz. B. sturionis 
Duvernoy from Acipenser , B. Olriki Krabbe from Sahrno carpio , and 
B. Budolphi Monticelli from the sole. 
But he has in addition some discussion of the general classification 
of Cestodes, and proposes the following arrangement. 
1. Sub-order. Atomiosoma. 
Fam. 1. Diplocotylidse. 
Fam. 2. Tricuspidariidae. 
2. Sub-order. Tomiosoma. 
Tribe I. Atrypanorhyncha. 
Sub-tribe (1) Monossichionia. 
Fam. 3. Cyat[h]obothriida3. 
Sub-tribe (2) Dissichionia. 
Fam. 4. Pseudobothriidm. 
Fam. 5. Dibothriidae. 
Sub-tribe (3) Tetrassichionia. 
Fam. 6. Tetrabothriidse. 
Fam. 7. Tetracotylidae. 
Tribe II. Trypanorhyncha. 
Fam. 8. Tetrarhynchidae. 
Cestodaria.J — Dr. F. S. Monticelli announces a monograph on the 
Cestodaria — a title under which he includes the simple, unjointed, 
monogenetic Cestodes — Gyrocotyle (= Amphiptyches), Amphilina, Caryo- 
phyllaeus, and Arcbigetes. In the present paper he gives a description of 
two forms, of which hitherto but little has been known, viz. Ampliilina 
liguloidea (Diesing) = Monostomum liguloideum Diesing, and Caryophyl- 
Iseus tuba Wagener (nec Siebold), = Ligula (Wagener), Monobotlirium 
(Diesing) tuba. 
New Cestodes. § — Dr. F. S. Monticelli describes several Cestode 
parasites of Lamna cornubica and BelpJiinus delphis. Among those 
which are found in the fish is CeratobotJirium xantlioceplialum g. et sp. n. 
In this member of the Tetrabothriidae the head is large and distinct ; the 
suckers are large, complete, and sessile, with a large and prominent 
* Estr. Boll. Soc. Nat. Napoli, vi. (1892) 3 pp. 
t Monitore Zool. Ital., iii. (1892) pp. 100-108. 
i Estr. Atti R. Accad. Sci. Napoli, v. (1892) 11 pp. (4 figs.). 
§ Bull. Mus. Zool. Torino, vii. (1892) No. 127, pp. 1-9 (1 pi.). 
