NOTES ON SCOTTISH CUMACEANS 221 



(19) Diastylis lucifera {Kr$yer). — I have notes of this 

 species from the Clyde district, and also from the Firth of Forth. 

 It was recorded for the Moray Firth district by the late T. Edward 

 ■of Banff; and quite recently it was captured, along with some other 

 interesting organisms, by Mr. Ff. C. Williamson, while tow-netting in 

 the Bay of Nigg, near Aberdeen. 



(20) Diastylis rostrata {Goodsir). — According to Sars, the 

 Alauna rostrata of Goodsir is identical with Diastylis Icevis, Norman, 

 and, being the older name, is adopted by him. This Cumacean was 

 recorded for the Firth of Forth by Henderson in December 1884. 1 

 It was dredged at Blackwaterfoot, Arran, in 20 fathoms, by the late 

 Dr. Robertson ; and it has been obtained in some gatherings 

 collected by tow-net off Aberdeen by the Fishery steamer " Garland." 



(21) Diastylis tumida (Lil/jeborg). — This somewhat rare 

 species was dredged at Blackwaterfoot, Arran, in 20 fathoms, 

 by the late Dr. Robertson. A specimen from the Moray Firth, 

 from 130 fathoms, measures fully 7 millemetres in length. This 

 species has the basal portion of the telson cylindrical, and nearly as 

 long as the tapering distal portion. 



(22) Diastylis echinata, Spence Bate. — This species is re- 

 corded for the Moray Firth by the late T. Fdward of Banff. 2 



(23) Diastylis spinosa, Norman. — Taken at Blackwaterfoot, 

 Arran, in 20 fathoms, and at low water on the west side of Helens- 

 burgh pier (Robertson). One or two specimens of a Diastylis which 

 appear to belong to this species were dredged at the mouth of the 

 Clyde, in 64 fathoms, between the Mull of Cantyre and Corse wall. 

 I have D. spinosa also from the Firth of Forth, collected off North 

 Berwick, 10-15 fathoms, in March 1891, but it has only recently 

 been identified. 



Gen. Diastyloides, G. O. Sars, 1900. 



(24) Diastyloides biplicata, G. O. Sars. — This appears to be 

 a moderately frequent as well as generally distributed species around 

 the Scottish coasts. The late Dr. Robertson records it from 

 Blackwaterfoot, Arran, where it was dredged in 20 fathoms. I have 

 obtained a number of specimens in the deep water (40 fathoms) 

 between Arran and the Ayrshire coast ; in 64 fathoms at the mouth 

 of the Clyde estuary ; and it has also been dredged near the head 

 of Loch Fyne. On the east coast I have obtained it in moderate 

 abundance in a gathering from 50 fathoms, collected about 7 miles 

 east by south of Girdleness ; and in considerably over 100 fathoms 

 in the Moray Forth, off Rosehearty. The Diastylis laviellata, 

 Norman, is a synonym of this species. 



1 "Proc. Roy. Phys. Soc," vol. viii. p. 311 (1883-1885). 

 2 " Life of a Scotch Naturalist," by Samuel Smiles, p. 431 (1877). 



