82 BENTHOPECTINIDAE. 



ASTROPECTINIDAE . 

 Dytaster demonstrans. 

 LuDwiG, 1905. Mem. M. C. Z., 32, p. 41. 



There is a good series of this species, both young (R = 10-25 mm.) and 

 adults (R up to 110 mm.) but Ludwig's very fuU account, with its numerous 

 figures, leaves no occasion for extended notice. Wliile I agree with Fisher that 

 demonstrans is probably identical with gilberti, I have not seen specimens of the 

 latter and therefore leave the point for future settlement. The following sta- 

 tions extend the range of demonstrans some 500 miles southward, and bathy- 

 metricaUy 150 fms. 



Station 4647. Eastern Tropical Pacific, 4° 33' S., 87° 42' 30" W., 2,005 fms. Bott. temp. 35.5°. Lt. gy. 



and br. glob. oz. 

 Station 4649. Eastern Tropical Pacific, 5° 17' S., 85° 19' 30" W., 2,235 fms. Bott. temp. 35.4°. Fne. 



stky. gy. m. 

 Station 4656. Eastern Tropical Pacific, 6° 54' 36" S., 83° 34' 18" W., 2,222 fms. Bott. temp, 35.2°. 



Fne. gn. m., mang. nod. 

 Station 4658. Eastern Tropical Pacific, 8° 30' S., 85° 35' 36" W., 2,370 fms. Bott. temp. 35.3°. Fne. 



gn. m., mang. nod. 



Eighteen specimens. 



Benthope ctinidab . 

 Pectinaster agassizii. 



Cheiraster agassizii Ludwig, 1905. Mem. M. C. Z., 32, p. 1. 



Pectinaster agassizii Ludwig, 1910. Sitz. K. Preuss. Akad. Wiss., 23, p. 449. 



These specimens are in rather poor condition and none have the arms 

 unbroken but R ranges from about 40 to 80 mm. Some specimens have a few 

 small pedicellariae on the abactinal sm-face close to the superomarginal plates 

 at the base of the rays but there are no intermarginal pedicellariae. These 

 specimens, while still agassizii, show some approach to Fisher's subspecies P. a. 

 evoplus from farther north. The exact locaHty where they were taken is not 

 certain, but it was probably at 



Station 4631. Panama: off Mariato Point, 72 miles, 774 fms. Bott. temp. 38°. Gn. s. 



Eleven specimens. 



GONIASTERIDAE. 

 Pseudarchaster pectinifer. 

 Ludwig, 1905. Mem. M. C. Z., 32, p. 106. 



These specimens, with R = 60 and 80 mm. respectively, are somewhat 

 intermediate between that originally described by Ludwig and the one discussed 



