586 SUMMARY OF CURRENT RESEARCHES RELATING TO 



and it is of great interest as belonging to a group which is most 

 characteristically marine. Like some other investigators, the author 

 favours the idea that the subterranean Crustacean fauna has been derived 

 not so much from the surface as directly from the sea itself. The 

 Algerian species may perhaps have arisen from some deep water 

 Mediterranean species such as Cirolana cceca Dollfus. 



Locomotor Organs of Gyge branchialis.* — P. Lo Giudiee has 

 studied the changes in the locomotor organs of this marine Isopod when 

 it becomes attached to Gebia litoralis, and he has also set the semi- 

 parasite or commensal at liberty to see what individual adaptations are 

 acquired by its reduced locomotor organs. 



The young animals can move very quickly in the water, but the 

 adults are fixed to their host and cannot move after they have been 

 attached for a certain time. 



But under certain conditions the commensal may be removed from 

 its bearer and kept in life for as many as 23 days. The thoracic limbs 

 undergo a slight increase in length and the animals are able to move 

 about a little. 



Maxillary Gland in Isopods.j — Alvis Rogenhofer has studied this 

 in various types. The Bopyridad have no antennary gland, but the 

 maxillary gland is well-developed, and shows the characteristic parts — 

 terminal vesicle, urinary canal, and efferent duct. In Oniscina3 the 

 maxillary gland is not degenerate (as JSTemec reported) but typical. The 

 results reached by Bruntz as to the maxillary gland of Isopods are con- 

 firmed, as also is Vejdovsky's description of funnel-cells (Trichterzellen). 

 In freshwater types the urinary canal of the maxillary and antennary 

 gland is longer than in marine types. 



Notes on Clyde Crustacea. J — Alexander Patience notes the 

 occurrence of Idothea neglecta G. 0. Sars and /. viridis Slabber within 

 the Clyde sea area. He has also collected /. pelagica Leach, /. emar- 

 ginata Fabr., /. linearis Pennant. 



In another paper § the author discusses Philocheras trispinosus 

 Hailstone, P. bispinosus Westwood, P. echinulatus M. Sars, P. neglecta* 

 G. 0. Sars, P. sculptus Bell., Pontophilus spinosus Leach, Grangon 

 vulgaris Linn., and C. alhnanni Kinahan. 



In another communication || the author deals with some terrestrial 

 Isopods new to the Clyde fauna] area, e.g. Trichoniscus pygmevus G. 0. 

 Sars, Porcellio dilatatus Brandt, and Metopotiorthus pruinosus Brandt. 



British Species of Trichoniscoides.^f — Alexander Patience dis- 

 tinguishes T. sarsi sp. n. from T. albidus Budde Lund, with which he 

 had previously identified it. Both are British. The structure of the 

 first and second pairs of pleopods of the male seems to afford practic- 

 ally constant specific distinctions. The author has some notes on 



* Zeitschr. wiss. Zool., xci. (1903) pp. 52-80 (1 pi.). 



t Arbeit. ZodI. Inst. Univ. Wien., xvii. (1903) pp. 139-56 (l;pl.). 



J Trans. Nat Hist. Soc. Glasgow, viii. (1908) pp. 4:2-6. 



§ Tom. cit., pp. 64-71. || Tom. cit., pp. 80-6. 



^ Ann. Nat. Hist., ii. (.1908) pp. 84-8 (1 pi.). 



