ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 581 



in detail. They are simple and on the whole like those in Dibothrio- 

 cephalus lotus Linn. All the genital ducts are lined with a syncytial 

 epithelium which becomes cuticular in certain regions (the cirrus and 

 the entrance to the vagina). There is an associated migration of the 

 epithelial nuclei through the basement-membrane and into the surround- 

 ing parenchymal cytoplasm. The eggs are ellipsoidal, with transparent 

 shells and an operculum. The embryo shows an internal oncosphere 

 and an external mantle, well supplied with cilia. 



New Species of Zschokkeella.* — II. A. Baylis describes Zschokkeella 

 murkola sp. n. from the intestine of a rat from the Gold Coast. The 

 rat was probably Epimys (Mus) rattus, the black rat. When held up 

 to the light the hinder segments of the worms appeared to be full of 

 small rounded bodies, evidently " egg-capsules." These gave the worm 

 a peculiar speckled appearance. The new species seems to be nearest 

 Inermica/psifer pyracis v. Janicki, which Beddard has included in the 

 genus Zschokkeela. The excretory system consists of a distinct pair of 

 dorsal longitudinal vessels and a ventral network arranged on a regular 

 plan, with a transverse vessel in each segment. Genital organs begin to 

 appear in the neck before the segments become clearly defined. The 

 testes are in two unequal groups, the larger group on the side remote 

 from the genital pores. A small rounded receptaculum seminis is present, 

 in addition to a fusiform expansion of the inner half of the vagina. 

 The uterus is a branched tube at first, becoming a transverse sac ; not 

 persistent. Each of the many egg-capsules in the gravid segments 

 contains about twenty eggs. 



New Trematodes.f— G. A. MacCallum reports on some of the 

 ectoparasitic Trematodes on fishes in the New York Aquarium. He 

 refers to the opportunities sometimes afforded of observing the parasites 

 alive. Thus crowds of Microcotyle may be seen sucking the blood from 

 the gill-filaments and causing a suffocating outflow of mucus. The 

 death of two snappers (Priacanthus cruentatus) fresh from the sea was 

 certainly caused by species of biplectamon. MacCallum describes Dvplec- 

 tanum teuthis sp. n. from the gills of Teuthis hepatus, D. lactophrys sp. n. 

 from the gills of the cow-fish (Lactophrys tricornis), D. batistes 

 sp.n. from the gills of a trigger- fish {Batistes car olinensis'), D. longiphallus 

 from the gills of a spade-fish (Ghsetodipterus faber). More striking, 

 however, is the new genus Atalostrophrion, represented by A. sardae fvom. 

 under the mucosa of the branchial cavity of the bonito {Sarda sarda), 

 and by A. promirrops from the gills of a large Jew-fish {Promkrops 

 guttatus). It is flat, ribbon-like, very narrow throughout, but attenuated 

 towards the anterior end. The uterus consists of two or three tubes 

 extending uncoiled nearly from one end to the other ; the ovary is 

 also tubular, but not nearly so long as the uterus ; the vitellarium and 

 vas deferens are also single tubes, the former nearly half as long as the 

 uterus ; the testis is also tubular, and the vas deferens extends through 

 nearly three-fourths of the length of the worm to end at the genital 

 atrium within the mouth. 



* Ann. Nat. Hist., xvi. (1915) pp. 40-50 (1 pi.), 

 t Zoologica, i. No. 20 (1915) pp. 395-410 (7 figs.). 



