ARGOPATAGUS VITREUS. 147 



men, and Mr. Agassiz and I, noting the close resemblance to the Siboga and 

 Valdivia specimens, and without thinking of Argopatagus, accepted the genus 

 Meijerea and described our specimen as M. excentrica. A few months later 

 we found additional material in the Albatross Japanese collections but we still 

 failed to think of Argopatagus. When, however, I came to revise all the genera 

 of spatangoids, the resemblance of Meijerea to Argopatagus struck me and 

 I soon reached the conclusion that the two names refer to the same animal. 

 Critical comparison of the Hawaiian specimen of excentrica with the descrip- 

 tion and figures of Argopatagus in the Challenger Report prove that they 

 are identical. The larger specimens from Japan are evidently humilis, yet 

 there is no doubt they are the same as excentrica. I am satisfied therefore that 

 both Phryssocystis humilis de Meijere and Meijerea excentrica A. Agassiz and 

 Clark are synonyms of Argopatagus vitreus. The best of our Japanese speci- 

 mens is almost exactly like de Meijere's photographs in the Siboga Report. 

 The pedicellariae of this species have been very fully and satisfactorily figured 

 by Doderlein, and de Meijere also gives some sketches. Further details are 

 therefore not needed here. 



Station 4039. Off Kawaihae Light, Hawaii, H. I. Bott. temp. 38.7°. 

 670-697 fms. Gy. m., for. 



Station 4908. Southwest of Koshika Islands, Japan. Bott. temp. 42.9° 

 434 fms. Gy. glob. oz. 



Station 4911. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 391 fms. Gy. glob. oz. 



Station 4912. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 391 fms. Gy. glob. oz. 



Station 4914. Southwest of Koshika Islands, Japan. Bott. temp. 41.9°. 

 427 fms. Gy. glob, oz., brk. sh. 



Station 4956. Between Kagoshima and Kobe, Japan. Bott. temp. 37.5°. 

 720 fms. Gn. br. m., fne. gy. s., for. 



Station 4980. South from Hamamatsu, Japan. Bott. temp. 39°. 507 

 fms. Br. m., fne. s., for. 



Bathymetrical range, 391-720 fms. Extremes of temperature, 42.9°- 

 37.5°. 



Three specimens and many fragments. 



