ISOPODA OF THE 'LIGHTNING' AND OTHEE EXPEDITIONS. 133 



The type specimen of C. brachiata was dredged by Stimpson " on a shelly and some- 

 what muddy bottom in 20 fathoms, off the northern point of Duck Island, New Bruns- 

 wick." We have been favoured with specimens by Mr. Whiteaves which were dredged 

 in 200 fathoms in the Gulf of St. Lawrence ; with others from Mr. S. I. Smith, which 

 were procured in the Bay of Fundy ; with a type specimen of Paranthura norvegica 

 from Professor G. O. Sars, which was dredged in 150-200 fathoms near Stadanger, in 

 Norway ; and the same kind friend has also sent us one of the " Paranthura arctica " 

 dredged by the ' Vdringer' in 1876 (Station 48 ; lat. 64° 36' N., long. 10° 21' W.), in 

 299 fathoms. 



It was taken in many of the dredgings of the ' Porcupine ' expedition : — 



1869.— Station 30, lat. 56° 24' N., long. 11° 49' W., 1360 fathoms. 



„ 36, „ 48° 50' N., „ 11° 9' W., 725 



„ 47, „ 59° 34' N., „ 7° 18' W., 542 



„ 65, „ 61° 10' N., „ 2° 21' W., 345 



„ 88, „ 59° 26' N., „ 8° 23' W., 705 



1870.— Station 1, „ 48° 38' N., „ 10° 15' W., 567 



Calathura brachiata has thus been traced from the east coast of America, across 

 the Atlantic, between Shetland and Faroe, off Norway, Scotland, and Ireland, and 

 between the south of England and the Bay of Biscay. 



It may always be at once distinguished by the impressed marks on the fourth and 

 two following segments of the perseon and the form of telson and uropods. 



Postscript, June 1, 1886. 



The foregoing paper was sent to the Society in the autumn of 1884: since that time some im- 

 portant papers on the Isopoda Chelifera have been published. 



1. C. Claus, "Ueber Apseudes latreillii, Edw., und die Tanaiden" (' Arbeiten aus dem zool. 

 Inst, der Univ. Wienund der zool. Stat, in Triest,' Tom. v. Heft iii., 1884). This is a morphological 

 paper dealing with the general structure of the body and its limbs. The species on which the 

 observations are based is called Apseudes latreillii, Edw. It is certainly not that species as under- 

 stood by other authors, and comes nearest to A. acutifrons, G. O. Sars. It, however, is distin- 

 guished from A. acutifrons in the rostrum being rather wider at the base, the ocular alse of quite 

 another form, wider and larger, and containing conspicuous eyes, and in slight differences in the 

 lower antenna and other parts. The second gnathopods are altogether different, the front margin 

 of the wrist being furnished with three, and that of the hand with six large spines. We would 

 suggest the name Apseudes hastifrons for this form. 



2. G. O. Sars/ Den Norske Nordhavs-Exped. 1876-8; XIV. Zoologi; Crustacea, I./ 1885. In 

 this admirable work the author fully describes and illustrates the following species :— Sphyi-apus 

 serratus, G. O. Sars ; Leptognathia longiremis, G. O. Sars ; Typhlotanais cornutus, G. O. Sars ; and 



vol. xii. — paet iv. No. 8. — October, 1886. x 



