OLIGOPODIA. 107 



Rhyncholampas pacifica. 



Pygorhynchus paciflcus A. Agassiz, 1863. Bull. M. C Z., 1, p. 27. 

 Rhyncholampas paciflcus A. Agassiz, 1869. Bull. M. C. Z., 1, p. 270. 



Plate 144, figs. 1-5. 



Only tridentate (rostrate) pedicellariae were found, though several fine 

 specimens were examined, but these show considerable range in size. The 

 large ones (PL 144, fig. 2) have valves (PI. 144, fig. 3) half a millimeter long or 

 more with the squarish base about half that in width; these valves are stout 

 with much calcareous mesh-work within and the blade has a strongly dentate 

 margin (PI. 144, fig. 4), the teeth on the sides being longer than those at the tip. 

 The smaller pedicellariae have the valves (PI. 144, fig. 5) flatter, with much 

 less mesh-work; they look more like ordinary tridentate pedicellariae. The 

 smallest have valves only about .15 mm. long. The miliary spines (PI. 144, 

 fig. 1) are notable for the peculiar series of 2-4 swellings, followed by distinct 

 constrictions near the tip. 



The Albatross brought home a single, small, dry specimen. 



Station 2995. Near Revillagigedo Islands. Bott. temp. 68.4°. 31 fms. 

 Gy. s., brk. co. 



Oligopodia. 



Duncan, 1889. Journ. Linn. Soc. Zool., 23, p. 176. 

 Type, Nucleolites epigonus v. Martens, 1865. Monatsb. Berlin Akad., Wiss., p. 143. 



Duncan proposed Oligopodia as a subgenus for the Recent species of Echino- 

 brissus although he mentions no species by name under the heading. Hamann 

 (1904. Bronn's Thier-reichs, 2, abt. 3, p. 1386) however, on elevating the group 

 to the rank of a genus limited it to epigonus alone, leaving Nucleolites recens 

 Milne Edwards and N. occidentalis Bell ( = Rhyncholampas cariboearum, as 

 already pointed out) in Nucleolites. In my judgment, N. recens is congeneric 

 with epigonus and both are quite different from typical Nucleolites of Lamarck. 

 The latter name must be used in preference to the more familiar Echinobrissus 

 as the latter is a pre-Linnaean name first revived by Gray in 1825. 



De Meijere examined the pedicellariae of 0. epigonus but his descrip- 

 tion is very brief and not very lucid. Three kinds of pedicellariae occur but 

 they are minute and infrequent, and hence hard to find. The tridentate and 



