CRUSTACEA MAI.ACOSTRACA. III. 



:-:. 



Calathura Norm. & Stebb. 



This genus has been well characterized by the English authors and by G. O. San. It may 

 be emphasized that in the maxillipeds the first joint has completely disappeared, as already figured 

 As to the statocyst in the telson see above p. 180. 



125. Calathura brachiata Stimpson. 

 (PL XV, fig. 3 a). 



1854. Anlhura brathiata Stimpson, Smiths. Contrib. to Knowl., VI, 1853, p. 43. 



i8;a arctua Heller, Denksch. math, natur. Classe der Kais. Akad. Wiss. VoL XXXV, p. 38; 



PI. IV, figs. 9- 1 a. 



! 1886. Calathura brachiata Noruian & Stebbing, op. cit p. 131 ; PL XXVI, fig. i. 

 ! 1897. G. O. Sars, Account, II, p. 46; PL XIX, fig. a, 



! 1897. norvfgica G. O. Sars, op. cit p. 45; PL XIX, fig. i. 



This species varies extremely as to size, and the largest specimens are from cold localities. I 

 have compared a few large specimens with the somewhat small specimens from the "Ingulf" Stat 32, 

 with the temperature 3-9, and at first I thought I had found a difference in the shape of the telson, which 

 is narrower and more produced in the large specimens, but afterwards I found pronounced variation 

 among the specimens from Stat 32. A female with young in the marsupium from this locality is 16-8 

 nun. long, another female with marsupium 18 mm., and the largest of the 41 specimens is 21 mm. A 

 specimen from the "Ingolf" Stat 126, temp. -5- 0-5, measured 39 mm., while my largest specimen, taken 

 in Scoresby Sound, East Greenland, 5 25 fath., is 45-5 mm.; Ohlin had a male measuring 43 mm. 



I have examined a co-type of C. noroegica G. O. S. presented by Sars, but was unable to see 

 the differences between this form and C. brachiata. Especially one of the dorsal impressions was well 

 developed, and the eyes seemed to be not more indistinct than in many specimens of C. brachiata\ 

 probably both are blind, as no vestige of facets can be discovered. According to Sars, the adult female 

 of C. norregica is 12 mm. long, but in spite of the difference in size I must agree with Ohlin and 

 Stappers, who after a careful examination cancelled C. norvcgica. On the statocyst (fig. 3 a) see p. i8a 



Some fifteen years ago I discovered in the marsupium of three specimens from Forsblad Fjord, 



'. Greenland, a most interesting parasite, which I believed must bean unknown genus of Cirri pedia 



Rhizocephala. Some years afterwards Dr. Geoffrey Smith worked out this material and found that 



the parasite was a very aberrant type of Rhizocephala, and he established it (1906) as Duplorbis Co- 



lathure G. Smith. 



Occurrence. Taken by the "In golf" at thirteen stations. 



Davis Strait: Stat 32: Lat 6635' N, Long. 56-38' W n 318 fath^ temp. 3^9; 41 spec 

 Stat 35: Lat 65i6' N., Long. 55O5' W., 362 fath., temp. 3-6"; i spec 



Denmark Strait: Stat 95: Lat 65i4' N, Long. 3o39' W, 752 fath., temp. ri; i spec 

 Stat 96: Lat 6s24' N., Long, vfad W., 735 fath., temp, ra*; i spec 



West of Iceland: Stat 85: Lat 63ai' N, Long. 25*21' W., 170 fath.; 3 spec 



South-West of Iceland: Stat 78: Lat 6o37' N, Long. 2752' W, 799 fath-, temp. 4-5; u spec 



