1902] The Holothmioidea of Xorthern Norway. 13 



they lived at a depth of 75 m., while S. inhærens, as far as I 

 know. has not in Norway been founcl at a greater depth than 50 m. ; 

 usually it hves at 2—30 m.^) Thus. as L. ImsJå without doiibt is 

 spread over the whole of Finmark, while Sfjnapta inhærens has 

 been found only once north of the Arctic circle, at the more southerly 

 part of Lofoten, it is highly probable that also Jaezynskt's S. in- 

 hærens on the Murman Coast (Wagxee 1885) is nothing but Lahi- 

 dojjlax lm sl' i. 



The specimens from Lofoten and Finmark (Porsanger) differ 

 only a little from those of more southern places. The anchors are 

 a little bigger, 0.140 — 0.190 mm. long. Li specimens from the 

 West coast of Norway, where this species probably is rather common 

 — personally I know it from the Hardanger Fiord, Bergen, the Sogne 

 Fiord, Christiansund and the Trondhjem Fiord — the anchors are 

 usually 0.110 — 0.150 mm; in specimens from Skager Rack and 

 Cattegat 0.080—0.140 mm. From places north of the Arctic circle 

 the length of the anchor-plates is about 85 7o of that of the anchors; 

 from places farther south the same length is from 90—100 %» 

 In the southern part of the district over which the species is spread, 

 it is found at a depth of from 20 — 420 m. 



14. Chiridota lævis (Fabeicius). 



This species is not in NoEDaAAED's coUection, but through 

 Danielssen (1861), M. Såes (1861) and Bidenkap (1899) it is 

 known as found at Groto 67° 50' N., Suiid 68° 1' N. and Tromso 

 69° 40' N., where it is said to be rather common, burying itseif 

 in the sand at a small depth (1 — 35 m.). I have also seen speci- 

 mens, which J. Spaeee Schneidee has collected in the Kvænangen 

 Fiord (about 70° N.) at a depth of 20 m., as well as some which 

 Dr. J. Hjoet got at the inner end of the Porsanger Fiord. It is 

 probably to be found all through East Finmark. Jaeztnskt alleges 

 its presence on the Murman Coast (Wagnee 1885). 



1) LuDWiG's statement (1900), that S. inhærens liad been foimd at a cleptli 

 of 232 m., rests on Danielssen & Koren's faulty examination of Lahidoplax 

 buskt from Porsanger Fiord. 



