ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
453 
Czokor’s alum cocliineal, and after dehydrating, mounting in gum 
Sandarac dissolved in absolute alcohol. 
The reproductive organs are remarkable for their simplicity, and no 
seminal vesicle or granule gland could be detected ; a great number of 
spermatozoa were found in all parts of the body, and there is, un- 
doubtedly, in this species a true “ hypodermic impregnation ” (Whitman). 
In the aquarium the sexually mature animals crawl over one another, 
and thrust their stylet-sliaped penes into one another’s bodies at any 
point. From this point, which may be found in sections, the spermato- 
zoa travel through the tissues to the uteri. 
As soon as the mature ova pass into the uteri the wall of the germinal 
vesicle fades away, and a spindle is formed with distinct polar suns, 
containing centrosomes. The small chromosomes, nine to ten in number, 
form an equatorial plate, and perhaps, undergo fission. The polar asters 
then grow faint and vanish, and the nucleus returns to the resting-stage. 
The author was unable to follow the development beyond the first 
cleavage stages. 
The animals did not survive long in the aquarium ; a slow process 
of dissolution set in at some point on the body and gradually more and 
more of the tissue melted away till only the tentacle- and brain-region 
remained ; this crept about for a few days, but finally it, too, disin- 
tegrated. 
New Marine Triclad.* — Mr. W. M. Wheeler describes, under the 
name of Syncoelidium joellucidum, a Triclad found in the gill-books of 
Limulus jpolyphemus. One of its most striking characters is its 
apparent metamerism, for the nervous system is quite as regularly 
metameric as in Gunda , and preliminary observation pointed to a pair 
of gut-diverticula, a pair of testes, and a pair of vitellaria to each trans- 
verse and each pair of lateral nerves; closer observation, however, 
showed that the gut-diverticula are very irregular in arrangement and 
number, and that the generative organs varied with them. We have, 
therefore, a condition which is intermediate between Gunda and the 
freshwater Triclads. 
The most striking peculiarity of the Triclad parasite of Limidus is 
fhe duplicity of the uterus, and the independent openings on the surface 
of the body ; this, coupled with the complete absence of rhabdites, leads 
Mr. Wheeler to the institution of the family Bdellouridae, as co-ordinate 
with the Planariidae and Geoplanidee; they may be defined as ecto- 
parasitic marine Triclads without auricular folds at the cephalic ends, 
without pigment, except in the two eyes, and without rhabdites ; with 
two uteri opening by discrete ostia lateral to the longitudinal nerves, 
and with ejaculatory ducts opening separately very near the penis. The 
genus Bdelloura has two (large) species, B. Candida Girard, and B. 
jpropinqua sp. n.; Syncoelidium pellucidum g. et sp. n. is small. The 
characters assigned by Yerrill to the family which he has proposed for 
B. Candida are not in all respects satisfactory. 
B> Candida oviposits during May and early June when the King-Crabs 
return from the deep water to the sandy beaches to breed, and the passage 
of the parasites from one crab to another must be favoured by the 
* Journal of Morphologv, ix. (1894) pp. 167-94 (1 pi.). 
2 i 
1894 
