334 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
linguatula found by P. J. van Beneden in Scymnus glacialis. He was 
able to distinguisb a scolex, a body, and a small round appendix at the 
hinder end ; the body was marked by deep transverse grooves, but there 
was no sort of segmentation. The appendix contained rudiments of 
both male and female organs. He thinks this form should be separated 
from the Tetrarhynchidae, and formed into a new genus allied to the 
Bothriocephalidae. It may be called Coenomorphus, and defined thus : — 
“ Scolex maguus bothriis duobus oppositis, dorso-ventralibus, angastis, 
rimaeformibus, limbo calloso, capiti immersis. Proboscides quatuor 
perbreves, crassae, subclavat^, uncinis armatae, in vaginas retractiles. 
Bases vaginarum oblongae. Collum cylindricum. Corpus depressum, 
taeniiforme, rugosum, sed inarticulatum, appendice postica rotundata.” 
The author regards this form as being a cestode-nurse of very consider- 
able size in which the genital organs are beginning to be developed, 
and which has mature sperm before there are any indications of 
segmentation. 
Cysticercoid with Caudal Appendages in Gammarus pulex.* * * § — 
Dr. O. Hamann describes some tailed cysticercoids which he found in 
Gammarus pulex. The investment by which they were contained was 
attached to the digestive tract ; the cysticercoids were about 1 • 3 mm. 
long, and 0*5 mm. of this was taken by the tail. The author gives an 
account of the various stages of development that he was able to observe. 
The other host appears to be the Duck. 
5. Incertae Sedis. 
Two new Species of E,otifers.| — Mr. D. Bryce states that Metopidia 
rliomhoidula might be easily passed over as M. triquetra, but the lorica 
has almost the shape of the ace of diamonds. Euchlanis subversa is, as 
its specific name is meant to show, a Euchlanis turned upside down, the 
ventral plate being considerably the larger, and strongly turned up at 
the sides. 
Echinodermata. 
British Fossil Crinoids.J — Mr. F. A. Bather has commenced a series 
of papers on British Fossil Crinoids. After a historical introduction he 
gives a statement as to the terminology which he intends to adopt — a 
matter of some importance in the present state of this group. The 
plate is illustrative of the structure of the dorsal cup in the genera of 
Fistulate Crinoids. 
Genesis of Actinocrinid8e.§ — Mr. C. E. Keyes has been led by his 
study of the Actinocrinidae to some conclusions which are, he thinks, of 
much wider bearing. He finds that it is clearly indicated that a large 
proportion of the genera date back much further geologically than 
actual observation shows. At times, in the phylogenetic history of a 
group, variations appear to go on with broad and rapid strides, and the 
* Jenaische Zeitschr. f. Naturwiss., xxiv. (1889) pp. 1-9 (1 pi.), 
t Science- Gossip, 1890, pp. 76-9 (5 figs.). 
t Ann. and Mag. Nat. Hist., v. (1890) pp. 306-34 (I pi.). 
§ Amer. Natural, xxiv. (1890) pp. 243-54 (3 pis.). 
