122 SUMMARY OF CURRENT RESEARCHES RELATING TO 



two perEeopods widened into large flat plates. The author also discusses * 

 some Australian and New Zealand Gammarids — Melita festiva (Chilton), 

 31sera viridis Haswell, M. insequipes (A. Costa), M. mastersii (Haswell), 

 and Ceradociis rulromacidatns (Stimpson) — most of which show con- 

 siderable local variation. In a third paper f the author gives a detailed 

 description of Parapherusa crassipes (Haswell) ; the systematic position, 

 of the genus is probably, as Stebbing suggested, between the genera 

 Paramicrnropus and AmathiUopsis. 



Studies on Isopods.t — Walter E. Collinge describes Pentias 

 thompsoni sp. n., an Idoteid from Yokohama. A description is also 

 given § of Idotea ochotensis Brandt, and of an interesting abnormality || 

 — a fold in the sixth mesosomatic segment — in the normally straight gut 

 of Idotea linearis. An account is given ^ of the structure of 31esidotea 

 sibirica, briefly described by Birula as Glyptonotus siiiricifs, and it is 

 shown ** that Idotea elofigata should be referred to the genus Gralyzoa. 

 Attention is directed jt to variations in some British woodlice. 



Male of Cyathura carinata.JJ — W. Omer Cooper found in Christ- 

 church Harbour, Hants, large numbers of this Isopod, which has only 

 twice previously been recorded from the British Isles. No description 

 of the male has hitherto been published, and the gap is now filled. The 

 first five abdominal segments are fused, at any rate dorsally, into a 

 single segment without any trace of suture line. The flagellum of the 

 antennules is rudimentary. The sexual stilet attached to the second 

 pair of pleopods has a unique structure. It is " distinctly jointed at its 

 base, terminating in a spoon-shaped expansion, from the base of which 

 extends a large flattened lobe, standing out at an angle to the main stem 

 of the organ, from the centre of which springs a slightly curved rod, 

 furnished at its extremity with a crown of about eight large reflexed 

 teeth." 



In another paper,§§ J. and W. Omer Cooper record, from the same 

 locality, Heterotanais oerstedi (Kroyer), which is remarkable in the rela- 

 tive large size and peculiar structure of the chelae of the male. They 

 also report Paragnathia halidaii (Bate and Westwood), the adult stages 

 of which are almost terrestrial, living in small cavities in the banks, 

 while the praniza-stages are parasitic on fishes. 



Monograph on American Sessile Barnacles. |1|1 — Henry A. Pilsbry 

 is to be congratulated on the completion of a report on the rich collec- 



* Trans. New Zealand Inst., xlviii. (1916) pp. 359-70 (6 figs.). 



t Ann. Mag. Nat. Hist., sviii. (1916) pp. 199-207 (3 pis.). 



X Journ. Zool. Research, i. (1916) pp. 33-5 (1 pi.), 



§ Journ. Zool. Research, i. (1916) pp 82-5(1 pi.). 



11 Journ. Zool. Research, i. (1916) pp. 86-8 (2 figs.). 



t Journ. Zool. Research, i. (1916) pp. 112-8 (1 pi.). 

 ** Journ. Zool. Research, i. (1916) pp. 119-20. 

 it Journ. Zool. Research, i. (1916) pp. 121-4. 

 XX Journ. Zool. Research, i. (1916) pp. 97-101 (4 figs.). 

 §§ Zoologist, XX. (1916) pp. 25-6. 



nil United States Nat. Museum, Bull. No. 93 (1916) xi and 866 pp. (76 pis.). 



