HOMOLAMPAS FULVA. 157 



to each other and the differences seem very trivial. The Siboga's East Indian 

 species is much better marked, so much so that Mr. Agassiz questioned whether 

 it is really a Homolampas. I have seen no specimens so do not attempt to 

 determine the point, but the pedicellariae do not indicate that any mistake has 

 been made in the generic designation. 



Key to the Species of Homolampas. 



No anal rostrum. 



Peristome and ambulacrum III in front of it, deeply sunken; width of test .75-.80 



length fulva. 



Peristome and ambulacrum III in front of it, not deeply sunken; width of test .65- 

 .70 length. 

 Peripetalous fasciole indistinct or wanting; margin of base of valves of rostrate 



pedicellariae, nearly smooth fragilis. 



Peripetalous fasciole very distinct; margin of base of valves of rostrate pedi- 

 cellariae with sharp teeth hastata. 



Anal rostrum present rostrata. 



Homolampas fulva. 



A. Agassiz, 1879. Proc. Amer. Acad., 14, p. 209. 



Plate 146, figs. 1-6. 



There are in the Albatross collection specimens of Homolampas from very 

 deep water in the Eastern Pacific which seem to be undoubtedly identical with 

 the species collected by the Challenger farther west at a similar great depth. 

 I cannot find tangible differences between them and the species figured by Wood- 

 Mason and Alcock and fully described and figured in detail by Koehler. It 

 is true that Koehler's figures of the pedicellariae do not agree in details with 

 mine, but his photographs (in this particular case) are not very satisfactory 

 and moreover he had only fragments of a single specimen with which to work. 

 For the present then I must consider glauca a synonym of fulva. 



Pedicellariae in the specimens at hand are very numerous but though greatly 

 diversified in size and form they seem to be all more or less modified trident ate. 

 There are certainly no globiferous and no ophicephalous pedicellariae ami what 

 I am calling triphyllous and rostrate are hardly more than forms of the tii- 

 dentate. All the pedicellariae have moderate stalks and all but the stout tad- 

 dentate have a well-developed neck. The rostrate pedicellariae (PI. 146, 



