[ 231 ] 



IV. On the Crustacea Isopoda of the ' Porcupine ' Exjpedition. 

 By the Rev. T. E. R. Stebbing, M.A., F.R.S., F.L.S., F.Z.S. 



(Eeceived August 28, 1912; Eead October 29, 1912.) 



[Plates XXIV.-XXVI.] 



Index. 



Page 



Systematic : — 



Tribe Flabbieifeka 231 



Family Gnathiid^ 232 



Gnathia cristatipes, sp. n. English Cbannel 232 



„ scJiistifrons, sp. n. West of Ireland 233 



sp. ■ Off Vigo, Spain 234 



AkidoffnatMa mclipus, g. et sp. n. On Ilockall Bank 235 



Tribe AsEELOiA 237 



Family (new) THAMBEiiATiDiB 237 



Thamiema amicorum, g. et sp. n. West of Ireland 237 



XHE first part of this Memoir, relating to the families Apseudidae, Tanaidse, and 

 Anthuridae, was read before the Society in December 1884, and published in the 

 'Transactions,' vol. xii. part iv. in October 1886. That so long an interval has 

 elapsed before the production of this further report is simply explained by the fact 

 that pressure of other engagements continually overshadowed the claims of the 

 interesting specimens now at last described. Three of the species belong to the tribe 

 called by Sars Flabellifera, and one stands in his tribe Asellota. In each tribe it has 

 been thought expedient to institute a new genus, with a new family for one of them, 

 and all four species are regarded as new *. 



In the original report the text depended largely for its merit and accuracy on the 

 experience of Canon Norman, and, but for his express refusal, his name should have 

 appeared as joint author of the present paper, for which he had prepared the way by 

 manuscript names of the genei^a and species. 



Tribe FLABELLIFERA. 



1882. Flabellifera G. O. Sars, Forh. Selsk. Christian, no. 18, p. 15. 



1886. Flabellifera Normau and Stebbing, Trans. Zool. Soc. London, vol. xii. part iv. p. 119. 



1897. Flabellifera G. O. Sars, Crustacea of Norway, vol. ii. part iii. p. 43. 



* [The complete account of these new forms appears here, but since the names and preliminary diagnoses 

 were published in the ' Abstract,' they are distinguished by being underlined. — Editoe.] 



VOL. XX. — PAET IV. No. 1. — February, 1913. 2 i 



