DK. P. n. CAKPENTEll ON SOME ATICTIC COMATIJLiE. 



68 



to Antedon hystrix, wliich is also an inhabitant of the cold area. 

 Butthis species now turns out to be identical with Antedon prolixa ; 

 and the resemblance of the ' Porcupine ' larva to that found at 

 Jan Mayen, together with the adult A. prolixa, is therefore an 

 important piece of evidence against Fischer's identification of 

 Antedon prolixa with A. tenella. 



Tenclla, Retziiis, 

 = dentata, Say, 

 =.Sarsii, Diiben & Koren. 



H.M.S. 'Porcupine,' B. 

 H.M.S. ' Triton,' B. 



The ' Willeni Barents,' B. 



SUMMABT. 



Prolixa, Sladen, 

 = hysfrix, Carpenter, 

 = celtica, Nansen. 



H.M.S. ' Porcupine,' 0. 

 The ' Tegetthotf,' B. 



H.MS. 'Alert,' B. 



H.M.S. ' Triton,' C. 



The ' Varna,' B. 



The ' Voringen,' A. 



Those from Jan Mayen, B. 

 A specimen from Fin mark 

 in the British Museian. 



Quadrata, Carpenter, 

 = celtica, Marenzeiler. 



The ' Tegetthoff,' A. 



H.M.S. ' Valorous,' A. 

 H.M.S. 'Alert,' A. 



H.M.S. 'Triton,' A. 



The ' Willera Barents,' A. 

 The ' Varna,' A. 



Those from Jau Mayen, A. 



EXPLANATION OF PLATE IL 



Fig. L Pentacrinoid of ^«/efZow /iTO/z.rfl, from Jan Mayen. X 10. 



2. Calyx and arm-bases of an immature A. prolixa, from the 'Tegetthoif' 



expedition. X 4. 



3. Portion of an arm of a young A. prolixa from Jan Mayen. (Br. 2-10). 



x6. 



4. Full-grown individual of .4. j^3ro^za;a. X4. 



5. Portion of an arm of A. tenella. (Br. 5-16). x6. 



6. Calyx and arm-bases of an immature A. tenella, from the West 



Atlantic. X 4. 



7. Calyx and arm-bases of a full-grown individual from the same loca- 



lity. X4. 



8. Pentacrinoid of A. tenella. Copied from Sars. 



