AGASSIZ AND CLAllK : RErOKT ON ECHINI. 233 



hursarium, an East Indian form, and Spcrosoma, Indo-Pacific and At- 

 lantic. The occurrence of a new species of llemipediua is interesting, as 

 well as that of Temuopleuridae of Indo-Pacific affinities, while none of the 

 allied Australian genera have been collected. The number of interesting 

 Clypeastroids collected is remarkable. Several of them are identical with 

 or closely allied to, the Clypeastroids collected by the " Siboga " in the 

 East Indian Archipelago, so that in this group the collection is typically 

 Indo-Pacific. The peculiar Laganidae are East Indian and Japanese. 

 A new genus of the closely circumscribed family of Echinoneidae, from 

 shallow water, is an important addition to the Pacific Fauna. 



A fair number of interesting Spatangoids were brought to light, 

 though the dredgings did not extend to depths great enough to include 

 the zone of the Urechinidae, Cystechinidae, and the like. Three genera 

 of Palaeopneustidae were obtained, Phrissocystis, Meijerea, and a new 

 genus (Pycnolampas) allied to Homolampas. The first two show affin- 

 ities with the Panamic and East Indian echinid faunae and Pycnolampas 

 with a Pacific and Atlantic type. Among the Spatangina are two species 

 of Gymnopatagus, suggesting East Indian affinities, and two Loveniae, 

 the one with East Indian the other with Panamic relations. A new 

 Ehinobrissus and several species of Brissopsis are allied to East Indian 

 and Pacific types. We may also mention the existence in the collection 

 of two species of Aceste thus far known only from the dredgings of the 

 "Challenger" in the Atlantic and Pacific, and the " Siboga" among the 

 East Indian islands, at depths of 620 to 2600 fathoms. The Hawaiian 

 species range only from 238 to 284 fathoms. Finally there is a fragment 

 of a species of Periaster which must have been of gigantic size among 

 the species of the genus. 



DESMOSTICHA Haeckel 

 CIDARIDAE MuLLER. 



Cidaris metiilaria Bl. 



Dorocidaris calacantha A. Ag. and Clark. 



Chondrocidaris gigantea A. Ag. 



Pkyllacanthus Thomasii A. Ag. and Clark. 



Stephanocidaris hawaiiensis A. Ag. and Clark. 



Stereocidaris grandis Dod. 



Stereocidaris leucacantha A. Ag. and Clark. 



Porocidaris variabilis A. Ag. and Clark. 



Acanthocidaris hastigera A. Ag. and Clark. 

 Descriptions of the above species, with numerous plates, have appeared in 

 "Hawaiian and Otlier Pacific Echini. The Cidaridae," Mem. M. C. Z., 34, 

 No. 1, Pebruary, 1907. 42 pages, 44 plates. 



