AGASSIZ AND CLARK: REPORT ON ECHINI. Ill 



off Japan were found TJrechinus and Cystecliinus, and among Palaeop- 

 neustidae one species of Meijerea is common to Bering Sea and the 

 Hawaiian Islands. Among the Spatangina we find Gymnopatagus, 

 Lovenia, and Pseudolovenia, both in Japan and the Hawaiian Islands. 

 Spatangus Liltkeni of Japan is closely allied to S. paueituberculatus of 

 the Hawaiian Islands. Brissopsis Oldhami and luzonica have a wide 

 range including both Japan and the Hawaiian Islands, and the genus 

 Aceste is also common to both regions. It is interesting to note the 

 occurrence of two species of Eehinocardium, of Hemiaster and of Peri- 

 aster; the last genus is also found in the Hawaiian Islands. A striking 

 difference between the Japanese and Hawaiian faunae is seen in the 

 abundance of Schizasters in the former region and their almost com- 

 plete absence in the latter. While our Hawaiian collection contains 

 only a single, very small specimen, there are several hundred in the 

 collection from Japan. 



It may be of interest to note that of the 49 genera taken by the 

 "Albatross" in the Hawaiian region, only 20 were taken also in Jap- 

 anese waters, and of the 67 species, only 9 are in the Japanese 

 collection. 



DESMOSTICHA Haeckel. 



CIDARIDAE Muller. 

 Dorocidaris Reini Dod. 



Cidarts (Dorocidaris) Reini Doderlein, 1887. Jap. Seeigel, p. 7 ; Taf. 4, figs. 1-7, 

 Taf. 8, figs. 4a-d. 



There is a single adult specimen from station 4933. "We also refer to (his 

 species two young Cidaridae, one 9, the other 13 mm. in diameter, from station 

 4936. These individuals are remarkable for their short, stout, primary spines, 

 which only about equal the diameter of the test and are noticeably swollen above 

 the neck. They are provided with ten or twelve longitudinal ridges but these 

 are not at all serrate, nor is there any indication of granules or prickles anywhere 

 on the spine. These peculiar primaries are yellowish-white, tipped with brown 

 and with two broad rings of the same color. They are unlike the spines of any 

 Cidaroid which we have seen and it is possible that the two specimens are really 

 the young of an hitherto undescribed species. 



Station 4933. Off Kagoshima Gulf, Japan, 152 fathoms. 

 " 4936. Off Kagoshima Gulf, Japan, 103 fathoms. 



Three specimens. 



