48 SUMMARY OF CURRENT RESEARCHES RELATING TO 



kossmanni Griard and Bonnier, parasitic, on Platyoniscus latipes, Caullery 



lias seen the production of " microniscid " stages. 



New Cave Isopod.* — E. G. Racovitza describes Spelozoniscus 

 debrugei g. et sp. n., from an Algerian cave. The very convex elliptical 

 body can be rolled into a ball ; the head is without frontal lobes, 

 antennary tubercles, or scutellum, but has a deep antennary grove on 

 each side of the median line ; the antennae are of the Cylisticus-type ; 

 the antennules have two joints ; some of the other appendages resemble 

 those of Cylisticus, others those of ArmadiUidium. Like Eleoniscus, 

 this new genus expresses the tendency of Porcellio-like forms to roll 

 themselves up, but it represents a failure in the solution of this problem. 

 The perfect ball of the widely distributed ArmadiUidium vulgare is a 

 complete solution, but in Spelmoniscus the antennas are kept extended 

 and exposed to attack. Thus Spelozoniscus has had to take refuge in a 

 subterranean habitat, " cet asile que dame nature installa a peu de frais 

 pour ses viellards, ses impotents et ses rates." The new type is colourless, 

 blind, and covered with tactile setre ; it has no longer any near relatives 

 in daylight ; it is an archaic representative of a fauna which has 

 disappeared. 



Terrestrial Isopods of the Family Eubelidse.t — Harriet Richardson 

 gives an account of a collection of new species of Eubelidas made in 

 Liberia by 0. F. Cook. A new genus, Ethelumoris, is established 

 near Ethelum ; the flagellum of the second antennas consists of two 

 joints, the coxopodites of the first thoracic segment extend along the 

 lateral margin, but arise from the underside of the segment. 



Cave Isopods. J — E. G. Racovitza reports on 16 cavernicolous species 

 of Isopods, e.g. Trichoniscus dispersus sp. n., Trichouiscoides pyrenmus 

 sp. n., T. tuberculatus sp. n., Anaphiloscia simani g. et sp. n., in the 

 neighbourhood of some of the forms included in the unnatural genus 

 Philoscia, PorceUio manacorisp. n., Cylisticus caver nicola sp. n., Eleoniscus 

 heleiue g. et sp. n. (the new genus presenting a mixture of characters 

 seen in Cylisticus and ArmadiUidium, but most nearly related to Elwna), 

 and ArmadiUidium pruvoti sp. n. 



Annulata. 



Urns of Sipunculids.§ — W. Selensky has studied the structure and 

 development of the much-discussed fixed and free-swimming " urns " of 

 Sipunculus nudus, comparing them with the free-swimming urns of 

 Pltymosoma and the fixed urns of Phymosoma and Aspidosiphon. An 

 urn consists of a vesicular cup, a neck, and a ciliated disk. It begins 

 as a bud-like outgrowth from the walls of a blood-vessel ; it consists 

 of the connective-tissue of the wall of the vessel, and is surrounded by 

 endothelial cells, among which there is one at least of the large ciliated 



* Arch. Zool. Exper., vii. (1907) Notes et Revue, No. 3, pp. lxix.-lxxvii. (9 figs.), 



t Smithsonian Misc. Collections, iv. (1907) pp. 219-47 (67 figs.). 



% Arch. Zool. Exper., vii. (1907) pp. 145-225 (11 pis.). 



§ Zool. Anzeig., xxxii. (1807) pp. 329-36 (4 figs.). 



